Ubuntu Server24.04 ; Suricata , SNORT3

Contents

Suricata
Snort3

Suricata

SURICATA IDS/IPS is an open source IDS that monitors communications on the network and detects suspicious traffic. Its basic mechanism is signature-based, so it can detect predefined unauthorized communications. Suricata is also characterized by its ability to provide protection as well as detection.

1.Suricata Install

①Install required packages

# apt -y install libpcre2-dev libpcre3 libpcre3-dbg libpcre3-dev build-essential autoconf automake libtool libpcap-dev libnet1-dev libyaml-0-2 libyaml-dev zlib1g zlib1g-dev libcap-ng-dev libcap-ng0 make libmagic-dev libjansson-dev libjansson4 pkg-config libnspr4-dev libnss3-dev liblz4-dev rustc cargo python3-pip

# apt -y install libnetfilter-queue-dev libnetfilter-queue1 libnfnetlink-dev libnfnetlink0

➁Suricata install
Please visit the official website to check the latest version. As of May 4, 2024, the latest stable version of Srikata is 7.0.5

Download and Extract

1 2	# wget https://www.openinfosecfoundation.org/download/suricata-7.0.5.tar.gz # tar xzf suricata-7.0.5.tar.gz

configuration and installation

# cd suricata-7.0.5

# /configure --enable-nfqueue --prefix=/usr --sysconfdir=/etc --localstatedir=/var

# make && make install-full

You can now start suricata by running as root something like:

/usr/bin/suricata -c /etc/suricata/suricata.yaml -i eth0

If a library like libhtp.so is not found, you can run suricata with:

LD_LIBRARY_PATH=/usr/lib /usr/bin/suricata -c /etc/suricata/suricata.yaml -i eth0

The Emerging Threats Open rules are now installed. Rules can be

updated and managed with the suricata-update tool.

For more information please see:

https://docs.suricata.io/en/latest/rule-management/index.html

make[1]: Leaving directory '/root/suricata-7.0.5'

Version Check

1 2	# suricata -V This is Suricata version 7.0.5 RELEASE

Stop the Suricata service as it needs to be configured first.

1	# systemctl stop suricata

2.Configure Suricata

①Determine interface and IP address where Suricata will inspect network packets

# ip --brief add

lo UNKNOWN 127.0.0.1/8 ::1/128

ens33 UP 192.168.11.83/24 fe80::xxx:xxxx:xxxx:xxxx/64

Edit /etc/suricata/suricata.yaml file

# vi /etc/suricata/suricata.yaml

# Line 18 : change

HOME_NET: "[192.168.11.0/24]"

# Kine 136 : change

community-id: false　→　community-id: true

# Line 615 : change

af-packet:

- interface: eth0

↓

af-packet:

- interface: ens33 ←Change to your own interface name

➁suricata Update

# suricata-update -o /etc/suricata/rules

-------omission-------

2/5/2024 -- 11:39:42 - <Info> -- Loaded 48910 rules.

2/5/2024 -- 11:39:42 - <Info> -- Disabled 14 rules.

2/5/2024 -- 11:39:42 - <Info> -- Enabled 0 rules.

2/5/2024 -- 11:39:42 - <Info> -- Modified 0 rules.

2/5/2024 -- 11:39:42 - <Info> -- Dropped 0 rules.

2/5/2024 -- 11:39:42 - <Info> -- Enabled 136 rules for flowbit dependencies.

2/5/2024 -- 11:39:42 - <Info> -- Backing up current rules.

2/5/2024 -- 11:39:42 - <Info> -- Writing rules to /etc/suricata/rules/suricata.rules: total: 48910; enabled: 37185; added: 48910; removed 0; modified: 0

2/5/2024 -- 11:39:42 - <Info> -- Writing /etc/suricata/rules/classification.config

2/5/2024 -- 11:39:43 - <Info> -- Testing with suricata -T.

2/5/2024 -- 11:40:07 - <Info> -- Done.

It also shows the number of rules processed, in this example 48910 were added, of which 37185 were activated.

➂Check configuration file

# suricata -T -c /etc/suricata/suricata.yaml -v

Notice: suricata: This is Suricata version 7.0.5 RELEASE running in SYSTEM mode

Info: cpu: CPUs/cores online: 2

Info: suricata: Running suricata under test mode

Info: suricata: Setting engine mode to IDS mode by default

Info: exception-policy: master exception-policy set to: auto

Info: logopenfile: fast output device (regular) initialized: fast.log

Info: logopenfile: eve-log output device (regular) initialized: eve.json

Info: logopenfile: stats output device (regular) initialized: stats.log

Info: detect: 1 rule files processed. 37236 rules successfully loaded, 0 rules failed, 0

Info: threshold-config: Threshold config parsed: 0 rule(s) found

Info: detect: 37239 signatures processed. 1137 are IP-only rules, 4877 are inspecting packet payload, 31013 inspect application layer, 108 are decoder event only

Notice: suricata: Configuration provided was successfully loaded. Exiting

④Confirm that the service starts
Enter the name of each network interface (ens33 in this case)

1	# suricata -c /etc/suricata/suricata.yaml -i ens33

The following appears

1 2	i: suricata: This is Suricata version 7.0.5 RELEASE running in SYSTEM mode i: threads: Threads created -> W: 2 FM: 1 FR: 1 Engine started

3.Automatic startup of Suricata services

①Create systemd service

# vi /etc/systemd/system/suricata.service

[Unit]

Description=Suricata IDS/IPS

After=network.target

[Service]

ExecStart=/usr/bin/suricata -c /etc/suricata/suricata.yaml -i ens33

[Install]

WantedBy=default.target

➁Enable Suricata

1 2	# systemctl enable suricata Created symlink /etc/systemd/system/default.target.wants/suricata.service → /etc/systemd/system/suricata.service

➂Start Suricata

1 2	# systemctl daemon-reload # systemctl start suricata

④Check Suricata's status

# systemctl status suricata

● suricata.service - Suricata IDS/IPS

Loaded: loaded (/etc/systemd/system/suricata.service; enabled; preset: enabled)

Active: active (running) since Fri 2024-05-03 12:46:02 JST; 30s ago

Main PID: 23182 (Suricata-Main)

Tasks: 8 (limit: 4556)

Memory: 776.9M (peak: 812.1M)

CPU: 3.049s

CGroup: /system.slice/suricata.service

mq23182 /usr/bin/suricata -c /etc/suricata/suricata.yaml -i ens33

May 03 12:46:02 lepard systemd[1]: Started suricata.service - Suricata IDS/IPS.

May 03 12:46:02 lepard suricata[23182]: i: suricata: This is Suricata version 7.0.5 RELEASE running in SYSTEM mode

May 03 12:46:05 lepard suricata[23182]: i: threads: Threads created -> W: 2 FM: 1 FR: 1 Engine started

4.Testing the Suricata Rule

①Test ET Open rule number 2100498

1 2	# curl http://testmynids.org/uid/index.html uid=0(root) gid=0(root) groups=0(root)

Check log file by specifying rule number

1 2	# grep 2100498 /var/log/suricata/fast.log 05/03/2024-12:54:12.517864 [] [1:2100498:7] GPL ATTACK_RESPONSE id check returned root [] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 99.86.199.74:80 -> 192.168.11.83:47068

➁Check events in /var/log/suricata/eve.log
Install jq

1	# apt install jq

Filter EVE Log events by searching for 2100498 signatures
Display alert objects with signature_id keys that match the values in 2100498

1	# jq 'select(.alert .signature_id==2100498)' /var/log/suricata/eve.json

The following appears

{

"timestamp": "2024-05-03T12:54:12.517864+0900",

"flow_id": 1259841387789651,

"in_iface": "ens33",

"event_type": "alert",

"src_ip": "99.86.199.74",

"src_port": 80,

"dest_ip": "192.168.11.83",

"dest_port": 47068,

"proto": "TCP",

"pkt_src": "wire/pcap",

"community_id": "1:b6Z5YOjKiLOagLna2F8gX75pnDM=",

"alert": {

"action": "allowed",

"gid": 1,

"signature_id": 2100498,

"rev": 7,

"signature": "GPL ATTACK_RESPONSE id check returned root",

"category": "Potentially Bad Traffic",

"severity": 2,

"metadata": {

"created_at": [

"2010_09_23"

"updated_at": [

"2019_07_26"

]

}

5.Creating and Applying Custom Rules

①Create custom signatures for Custom Rules files

# vi /etc/suricata/rules/local.rules

Include the following

alert icmp any any -> $HOME_NET any (msg:"ICMP Ping"; sid:10001; rev:1;)

➁Edit configuration file (define path for local.rules above)

# vi /etc/suricata/suricata.yaml

# Added around line 2155

default-rule-path: /var/lib/suricata/rules

rule-files:

- suricata.rules

- /etc/suricata/rules/local.rules

③Testing the configuration file

# suricata -T -c /etc/suricata/suricata.yaml -v

Notice: suricata: This is Suricata version 7.0.5 RELEASE running in SYSTEM mode

Info: cpu: CPUs/cores online: 2

Info: suricata: Running suricata under test mode

Info: suricata: Setting engine mode to IDS mode by default

Info: exception-policy: master exception-policy set to: auto

Info: logopenfile: fast output device (regular) initialized: fast.log

Info: logopenfile: eve-log output device (regular) initialized: eve.json

Info: logopenfile: stats output device (regular) initialized: stats.log

Info: detect: 2 rule files processed. 37237 rules successfully loaded, 0 rules failed, 0

Info: threshold-config: Threshold config parsed: 0 rule(s) found

Info: detect: 37240 signatures processed. 1138 are IP-only rules, 4877 are inspecting packet payload, 31013 inspect application layer, 108 are decoder event only

Notice: suricata: Configuration provided was successfully loaded. Exiting

④Suricat service restart

1	# systemctl restart suricata

⑤Testing the application of Custom Rules
Run ping on another PC on the same local network to see if it was logged

# cat /var/log/suricata/fast.log

05/03/2024-13:06:06.322710 [**] [1:10000:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.22:8 -> 192.168.11.83:0

05/03/2024-13:06:06.322819 [**] [1:10000:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.83:0 -> 192.168.11.22:0

⑥Obtain logs in JSON format

Ping another PC on the same local network

# tail -f /var/log/suricata/eve.json | jq 'select(.event_type=="alert")'

When ping is executed, the following is displayed in the console

{

"timestamp": "2024-05-03T13:24:01.134991+0900",

"flow_id": 298106683534580,

"in_iface": "ens33",

"event_type": "alert",

"src_ip": "192.168.11.83",

"src_port": 0,

"dest_ip": "192.168.11.22",

"dest_port": 0,

"proto": "ICMP",

"icmp_type": 0,

"icmp_code": 0,

"pkt_src": "wire/pcap",

"community_id": "1:s8KsUEhci/Nac9CjIft0d/rc2+U=",

"alert": {

"action": "allowed",

"gid": 1,

"signature_id": 10001,

"rev": 1,

"signature": "ICMP Ping",

"category": "",

"severity": 3

"direction": "to_client",

"flow": {

"pkts_toserver": 2,

"pkts_toclient": 1,

"bytes_toserver": 148,

"bytes_toclient": 74,

"start": "2024-05-03T13:24:01.134944+0900",

"src_ip": "192.168.11.22",

"dest_ip": "192.168.11.83"

}

6.Adding a Rule Set Provider

①List Default Provider List

# suricata-update list-sources

Name: et/open
  Vendor: Proofpoint
  Summary: Emerging Threats Open Ruleset
  License: MIT
Name: et/pro
  Vendor: Proofpoint
  Summary: Emerging Threats Pro Ruleset
  License: Commercial
  Replaces: et/open
  Parameters: secret-code
  Subscription: https://www.proofpoint.com/us/threat-insight/et-pro-ruleset
Name: etnetera/aggressive
  Vendor: Etnetera a.s.
  Summary: Etnetera aggressive IP blacklist
  License: MIT
Name: malsilo/win-malware
  Vendor: malsilo
  Summary: Commodity malware rules
  License: MIT
Name: oisf/trafficid
  Vendor: OISF
  Summary: Suricata Traffic ID ruleset
  License: MIT
Name: scwx/enhanced
  Vendor: Secureworks
  Summary: Secureworks suricata-enhanced ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: scwx/malware
  Vendor: Secureworks
  Summary: Secureworks suricata-malware ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: scwx/security
  Vendor: Secureworks
  Summary: Secureworks suricata-security ruleset
  License: Commercial
  Parameters: secret-code
  Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)
Name: sslbl/ja3-fingerprints
  Vendor: Abuse.ch
  Summary: Abuse.ch Suricata JA3 Fingerprint Ruleset
  License: Non-Commercial
Name: sslbl/ssl-fp-blacklist
  Vendor: Abuse.ch
  Summary: Abuse.ch SSL Blacklist
  License: Non-Commercial
Name: stamus/lateral
  Vendor: Stamus Networks
  Summary: Lateral movement rules
  License: GPL-3.0-only
Name: tgreen/hunting
  Vendor: tgreen
  Summary: Threat hunting rules
  License: GPLv3

# suricata-update list-sources

Name: et/open

Vendor: Proofpoint

Summary: Emerging Threats Open Ruleset

License: MIT

Name: et/pro

Vendor: Proofpoint

Summary: Emerging Threats Pro Ruleset

License: Commercial

Replaces: et/open

Parameters: secret-code

Subscription: https://www.proofpoint.com/us/threat-insight/et-pro-ruleset

Name: etnetera/aggressive

Vendor: Etnetera a.s.

Summary: Etnetera aggressive IP blacklist

License: MIT

Name: malsilo/win-malware

Vendor: malsilo

Summary: Commodity malware rules

License: MIT

Name: oisf/trafficid

Vendor: OISF

Summary: Suricata Traffic ID ruleset

License: MIT

Name: scwx/enhanced

Vendor: Secureworks

Summary: Secureworks suricata-enhanced ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: scwx/malware

Vendor: Secureworks

Summary: Secureworks suricata-malware ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: scwx/security

Vendor: Secureworks

Summary: Secureworks suricata-security ruleset

License: Commercial

Parameters: secret-code

Subscription: https://www.secureworks.com/contact/ (Please reference CTU Countermeasures)

Name: sslbl/ja3-fingerprints

Vendor: Abuse.ch

Summary: Abuse.ch Suricata JA3 Fingerprint Ruleset

License: Non-Commercial

Name: sslbl/ssl-fp-blacklist

Vendor: Abuse.ch

Summary: Abuse.ch SSL Blacklist

License: Non-Commercial

Name: stamus/lateral

Vendor: Stamus Networks

Summary: Lateral movement rules

License: GPL-3.0-only

Name: tgreen/hunting

Vendor: tgreen

Summary: Threat hunting rules

License: GPLv3

If you include the tgreen/hunting ruleset as an example

# suricata-update enable-source tgreen/hunting

4/5/2024 -- 11:23:57 - <Info> -- Using data-directory /var/lib/suricata.

4/5/2024 -- 11:23:57 - <Info> -- Using Suricata configuration /etc/suricata/suricata.yaml

4/5/2024 -- 11:23:57 - <Info> -- Using /usr/share/suricata/rules for Suricata provided rules.

4/5/2024 -- 11:23:57 - <Info> -- Found Suricata version 7.0.5 at /usr/bin/suricata.

4/5/2024 -- 11:23:57 - <Warning> -- Source index does not exist, will use bundled one.

4/5/2024 -- 11:23:57 - <Warning> -- Please run suricata-update update-sources.

4/5/2024 -- 11:23:57 - <Info> -- Creating directory /var/lib/suricata/update/sources

4/5/2024 -- 11:23:57 - <Info> -- Enabling default source et/open

4/5/2024 -- 11:23:57 - <Info> -- Source tgreen/hunting enabled

Perform update

1	# suricata-update -o /etc/suricata/rules

Snort3

1.Install required packages

# apt install build-essential libpcap-dev libpcre3-dev libnet1-dev zlib1g-dev luajit hwloc libdumbnet-dev bison flex liblzma-dev openssl libssl-dev pkg-config libhwloc-dev cmake cpputest libsqlite3-dev uuid-dev libcmocka-dev libnetfilter-queue-dev libmnl-dev autotools-dev libluajit-5.1-dev libunwind-dev libfl-dev -y

2. Install DAQ library

Download and install DAQ library

# git clone https://github.com/snort3/libdaq.git

# cd libdaq/

~/libdaq# ./bootstrap

~/libdaq# ./configure

~/libdaq# make

~/libdaq# make install

3. Install Gperftools

Profiler tool used to improve the performance of a particular application or service by improving memory handling in multiple instances

# cd

# wget https://github.com/gperftools/gperftools/releases/download/gperftools-2.13/gperftools-2.13.tar.gz

# tar xzf gperftools-2.13.tar.gz

# cd gperftools-2.13

~/gperftools-2.13# ./configure

~/gperftools-2.13# make

~/gperftools-2.13# make install

4. SNORT3 Install

①Download and deploy SNORT3

# cd

# wget https://github.com/snort3/snort3/archive/refs/heads/master.zip

# apt install unzip

# unzip master.zip

# cd snort3-master

➁configuration

# ./configure_cmake.sh --prefix=/usr/local --enable-tcmalloc
-------------------------------------------------------
snort version 3.1.84.0

Install options:
    prefix:     /usr/local
    includes:   /usr/local/include/snort
    plugins:    /usr/local/lib/snort

Compiler options:
    CC:             /usr/bin/cc
    CXX:            /usr/bin/c++
    CFLAGS:            -fvisibility=hidden   -DNDEBUG -g -ggdb  -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free  -O2 -g -DNDEBUG
    CXXFLAGS:          -fvisibility=hidden   -DNDEBUG -g -ggdb  -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free  -O2 -g -DNDEBUG
    EXE_LDFLAGS:
    MODULE_LDFLAGS:

Feature options:
    DAQ Modules:    Static (afpacket;bpf;dump;fst;gwlb;nfq;pcap;savefile;trace)
    libatomic:      System-provided
    Hyperscan:      OFF
    ICONV:          ON
    Libunwind:      ON
    LZMA:           ON
    RPC DB:         Built-in
    SafeC:          OFF
    TCMalloc:       ON
    JEMalloc:       OFF
    UUID:           ON
    NUMA:           ON
    LibML:          OFF
-------------------------------------------------------

-- Configuring done (4.5s)
-- Generating done (0.5s)
-- Build files have been written to: /root/snort3-master/build

# ./configure_cmake.sh --prefix=/usr/local --enable-tcmalloc

-------------------------------------------------------

snort version 3.1.84.0

Install options:

prefix: /usr/local

includes: /usr/local/include/snort

plugins: /usr/local/lib/snort

Compiler options:

CC: /usr/bin/cc

CXX: /usr/bin/c++

CFLAGS: -fvisibility=hidden -DNDEBUG -g -ggdb -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O2 -g -DNDEBUG

CXXFLAGS: -fvisibility=hidden -DNDEBUG -g -ggdb -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-free -O2 -g -DNDEBUG

EXE_LDFLAGS:

MODULE_LDFLAGS:

Feature options:

DAQ Modules: Static (afpacket;bpf;dump;fst;gwlb;nfq;pcap;savefile;trace)

libatomic: System-provided

Hyperscan: OFF

ICONV: ON

Libunwind: ON

LZMA: ON

RPC DB: Built-in

SafeC: OFF

TCMalloc: ON

JEMalloc: OFF

UUID: ON

NUMA: ON

LibML: OFF

-------------------------------------------------------

-- Configuring done (4.5s)

-- Generating done (0.5s)

-- Build files have been written to: /root/snort3-master/build

➂Install

# cd build

# make

# make install

④Update shared libraries

1	# ldconfig

⑤Check version

# snort -V

,,_ -*> Snort++ <*-

o" )~ Version 3.1.84.0

'''' By Martin Roesch & The Snort Team

http://snort.org/contact#team

Using DAQ version 3.0.14

Using LuaJIT version 2.1.1703358377

Using OpenSSL 3.0.13 30 Jan 2024

Using libpcap version 1.10.4 (with TPACKET_V3)

Using PCRE version 8.39 2016-06-14

Using ZLIB version 1.3

Using LZMA version 5.4.5

⑥Test default settings

1	# snort -c /usr/local/etc/snort/snort.lua

If it is normal, it will be displayed as follows

--------------------------------------------------
o")~   Snort++ 3.1.84.0
--------------------------------------------------
Loading /usr/local/etc/snort/snort.lua:
Loading snort_defaults.lua:
Finished snort_defaults.lua:

----omission-----

--------------------------------------------------
rule counts
       total rules loaded: 208
               text rules: 208
            option chains: 208
            chain headers: 1
--------------------------------------------------
service rule counts          to-srv  to-cli
                  file_id:      208     208
                    total:      208     208
--------------------------------------------------
fast pattern groups
                to_server: 1
                to_client: 1
--------------------------------------------------
search engine (ac_bnfa)
                instances: 2
                 patterns: 416
            pattern chars: 2508
               num states: 1778
         num match states: 370
             memory scale: KB
             total memory: 68.5879
           pattern memory: 18.6973
        match list memory: 27.3281
        transition memory: 22.3125
appid: MaxRss diff: 3328
appid: patterns loaded: 300
--------------------------------------------------
pcap DAQ configured to passive.

Snort successfully validated the configuration (with 0 warnings).
o")~   Snort exiting

--------------------------------------------------

o")~ Snort++ 3.1.84.0

--------------------------------------------------

Loading /usr/local/etc/snort/snort.lua:

Loading snort_defaults.lua:

Finished snort_defaults.lua:

----omission-----

--------------------------------------------------

rule counts

total rules loaded: 208

text rules: 208

option chains: 208

chain headers: 1

--------------------------------------------------

service rule counts to-srv to-cli

file_id: 208 208

total: 208 208

--------------------------------------------------

fast pattern groups

to_server: 1

to_client: 1

--------------------------------------------------

search engine (ac_bnfa)

instances: 2

patterns: 416

pattern chars: 2508

num states: 1778

num match states: 370

memory scale: KB

total memory: 68.5879

pattern memory: 18.6973

match list memory: 27.3281

transition memory: 22.3125

appid: MaxRss diff: 3328

appid: patterns loaded: 300

--------------------------------------------------

pcap DAQ configured to passive.

Snort successfully validated the configuration (with 0 warnings).

o")~ Snort exiting

5. Identify and configure network interfaces

①Check network interface

# ip addr

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

inet 127.0.0.1/8 scope host lo

valid_lft forever preferred_lft forever

inet6 ::1/128 scope host noprefixroute

valid_lft forever preferred_lft forever

2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

link/ether 00:0c:29:1c:f2:f6 brd ff:ff:ff:ff:ff:ff

altname enp2s1

inet 192.168.11.83/24 brd 192.168.11.255 scope global ens33

valid_lft forever preferred_lft forever

inet6 fe80::20c:29ff:fe1c:f2f6/64 scope link

valid_lft forever preferred_lft forever

The network interface name is ens33

➁Set network interface to promiscuous mode

1	# ip link set dev ens33 promisc on

Check settings

1 2	# ip addr \| grep ens33 \| grep mtu 2: ens33: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000

➂Set Large Receive Offload (LRO) and Generic Receive Offload (GRO) to off state

Check current status

# ethtool -k ens33 | grep receive-offload

generic-receive-offload: on

large-receive-offload: off [fixed]

Set LRO and GRO offload status to off state

1	# ethtool -K ens33 gro off lro off

6. Create systemd service for network interface

1 2	# touch /etc/systemd/system/snort3-nic.service # vi /etc/systemd/system/snort3-nic.service

Contents of snort3-nic.service

[Unit]

Description=Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot

After=network.target

[Service]

Type=oneshot

ExecStart=/usr/sbin/ip link set dev ens33 promisc on

ExecStart=/usr/sbin/ethtool -K ens33 gro off lro off

TimeoutStartSec=0

RemainAfterExit=yes

[Install]

WantedBy=default.target

Reload the systemd daemon and apply the changes

1	# systemctl daemon-reload

Start and enable snort3-nic.service

# systemctl start snort3-nic.service

# systemctl enable snort3-nic.service

Created symlink /etc/systemd/system/default.target.wants/snort3-nic.service → /etc/systemd/system/snort3-nic.service

Check the status of snort3-nic.service

# systemctl status snort3-nic.service

● snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot

Loaded: loaded (/etc/systemd/system/snort3-nic.service; enabled; preset: enabled)

Active: active (exited) since Fri 2024-05-03 17:43:10 JST; 39s ago

Main PID: 61473 (code=exited, status=0/SUCCESS)

CPU: 6ms

May 03 17:43:10 lepard systemd[1]: Starting snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot...

May 03 17:43:10 lepard systemd[1]: Finished snort3-nic.service - Set Snort 3 NIC in promiscuous mode and Disable GRO, LRO on boot.

7. Adding Snort Rules

7.1 Community rule sets added

①Create a folder for Snort rules and download the community ruleset from the Snort website

1 2	# mkdir /usr/local/etc/snort/rules # wget -qO- https://www.snort.org/downloads/community/snort3-community-rules.tar.gz \| tar xz -C /usr/local/etc/snort/rules/

➁ Edit Snort main configuration file

# vi /usr/local/etc/snort/snort.lua

# Line 24 : Change to own network

HOME_NET = '192.168.11.0/24'

# Line 28 : change

EXTERNAL_NET = '!$HOME_NET'

# Per Line 193 : add

ips =

{

-- use this to enable decoder and inspector alerts

-- enable_builtin_rules = true,

-- use include for rules files; be sure to set your path

-- note that rules files can include other rules files

-- (see also related path vars at the top of snort_defaults.lua)

variables = default_variables,

rules = [[

include /usr/local/etc/snort/rules/snort3-community-rules/snort3-community.rules

]]

}

➂Test main configuration changes

# snort -c /usr/local/etc/snort/snort.lua

If all is well, the following is displayed

...

--------------------------------------------------

search engine (ac_bnfa)

instances: 338

patterns: 10778

pattern chars: 175278

num states: 123344

num match states: 10498

memory scale: MB

total memory: 3.68713

pattern memory: 0.577984

match list memory: 1.33597

transition memory: 1.73192

fast pattern only: 7099

appid: MaxRss diff: 3328

appid: patterns loaded: 300

--------------------------------------------------

pcap DAQ configured to passive.

Snort successfully validated the configuration (with 0 warnings).

o")~ Snort exiting

7.2 Add custom rules

①Create a file in the Snort rules directory

# touch /usr/local/etc/snort/rules/local.rules

# vi /usr/local/etc/snort/rules/local.rules

alert icmp any any -> $HOME_NET any (msg:"Incoming ICMP"; sid:1000001; rev:1;)

➁Edit Snort Main Configuration

# vi /usr/local/etc/snort/snort.lua

# Add per line 194

ips =

{

-- use this to enable decoder and inspector alerts

-- enable_builtin_rules = true,

-- use include for rules files; be sure to set your path

-- note that rules files can include other rules files

-- (see also related path vars at the top of snort_defaults.lua)

variables = default_variables,

rules = [[

include /usr/local/etc/snort/rules/local.rules

include /usr/local/etc/snort/rules/snort3-community-rules/snort3-community.rules

]]

}

➂Test main configuration changes

# snort -c /usr/local/etc/snort/snort.lua

If all is well, the following is displayed

...

--------------------------------------------------

search engine (ac_bnfa)

instances: 338

patterns: 10778

pattern chars: 175278

num states: 123344

num match states: 10498

memory scale: MB

total memory: 3.68713

pattern memory: 0.577984

match list memory: 1.33597

transition memory: 1.73192

fast pattern only: 7099

appid: MaxRss diff: 3328

appid: patterns loaded: 300

--------------------------------------------------

pcap DAQ configured to passive.

Snort successfully validated the configuration (with 0 warnings).

o")~ Snort exiting

8. OpenAppID Installation

Once the OpenAppID extension is installed, Snort can detect network threats at the application layer level

①Download and deploy OpenAppID

1 2	# wget https://www.snort.org/downloads/openappid/33380 -O OpenAppId-33380.tgz # tar -xzvf OpenAppId-33380.tgz

➁Copy the extracted folder (odp) to the following directory

1	# cp -R odp /usr/local/lib/

➂Edit the main configuration file and define the location of the OpenAppID folder

# vi /usr/local/etc/snort/snort.lua

Add per line 101

appid =

{

-- appid requires this to use appids in rules

app_detector_dir = '/usr/local/lib',

log_stats = true,

}

Add per line 105

appid_listener =

{

json_logging = true,

file = "/var/log/snort/appid-output.log",

}

④Test main configuration changes

# snort -c /usr/local/etc/snort/snort.lua

If all is well, the following is displayed

...

--------------------------------------------------

search engine (ac_bnfa)

instances: 338

patterns: 10778

pattern chars: 175278

num states: 123344

num match states: 10498

memory scale: MB

total memory: 3.68713

pattern memory: 0.577984

match list memory: 1.33597

transition memory: 1.73192

fast pattern only: 7099

appid: MaxRss diff: 225920

appid: patterns loaded: 11537

--------------------------------------------------

pcap DAQ configured to passive.

Snort successfully validated the configuration (with 0 warnings).

o")~ Snort exiting

9. Create systemd service for Snort

9.1 Check all setups

Snort on network interface using local.rules

1	# snort -c /usr/local/etc/snort/snort.lua -R /usr/local/etc/snort/rules/local.rules -i ens33 -A alert_fast -s 65535 -k none

Sending a ping command to the Ubuntu server IP address from another PC on the same network
You will see the following alert log in the console window of the host server

05/03-19:11:01.942097 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:01.942098 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:01.974136 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:02.948665 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:02.948665 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:02.948739 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:02.948845 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:03.956689 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:03.956689 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:03.956746 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:03.956824 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:04.966197 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:04.966197 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83
05/03-19:11:04.966304 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22
05/03-19:11:04.966564 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:01.942097 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83

05/03-19:11:01.942098 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83

05/03-19:11:01.974136 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:02.948665 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83

05/03-19:11:02.948739 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:02.948845 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:03.956689 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83

05/03-19:11:03.956746 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:03.956824 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:04.966197 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.22 -> 192.168.11.83

05/03-19:11:04.966304 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

05/03-19:11:04.966564 [**] [1:1000001:1] "Incoming ICMP" [**] [Priority: 0] [AppID: ICMP] {ICMP} 192.168.11.83 -> 192.168.11.22

9.2 Create systemd service for Snort

①Create user (snort) for Snort service

1	# useradd -r -s /usr/sbin/nologin -M snort

➁Create log folder and set permissions

# mkdir /var/log/snort

# chmod -R 5775 /var/log/snort

# chown -R snort:snort /var/log/snort

➂Create SNORT systemd service file

1 2	# touch /etc/systemd/system/snort3.service # vi /etc/systemd/system/snort3.service

Contents of snort3.service

[Unit]

Description=Snort3 IDS Daemon Service

After=syslog.target network.target

[Service]

Type=simple

ExecStart=/usr/local/bin/snort -c /usr/local/etc/snort/snort.lua -s 65535 -k none -l /var/log/snort -D -i ens33 -m 0x1b -u snort -g snort

ExecStop=/bin/kill -9 $MAINPID

[Install]

WantedBy=multi-user.target

④Reload and enable Snort service

# systemctl daemon-reload

# systemctl enable --now snort3

Created symlink /etc/systemd/system/multi-user.target.wants/snort3.service → /etc/systemd/system/snort3.service.

⑤Start Snort service and check status

# systemctl start snort3
# systemctl status snort3
● snort3.service - Snort3 IDS Daemon Service
     Loaded: loaded (/etc/systemd/system/snort3.service; enabled; preset: enabled)
     Active: active (running) since Sat 2024-05-04 09:41:16 JST; 1min 52s ago
   Main PID: 1658 (snort3)
      Tasks: 2 (limit: 4556)
     Memory: 288.9M (peak: 289.2M)
        CPU: 4.633s
     CGroup: /system.slice/snort3.service
             mq1658 /usr/local/bin/snort -c /usr/local/etc/snort/snort.lua -s 65535 -k none -l /var/log/snort -D -i ens33 -m 0x1b -u snort -g snort

May 04 09:41:16 lepard snort[1658]:                 instances: 338
May 04 09:41:16 lepard snort[1658]:                  patterns: 10778
May 04 09:41:16 lepard snort[1658]:             pattern chars: 175278
May 04 09:41:16 lepard snort[1658]:                num states: 123344
May 04 09:41:16 lepard snort[1658]:          num match states: 10498
May 04 09:41:16 lepard snort[1658]:              memory scale: MB
May 04 09:41:16 lepard snort[1658]:              total memory: 3.68713
May 04 09:41:16 lepard snort[1658]:            pattern memory: 0.577984
May 04 09:41:16 lepard snort[1658]:         match list memory: 1.33597
May 04 09:41:16 lepard snort[1658]:         transition memory: 1.73192

# systemctl start snort3

# systemctl status snort3

● snort3.service - Snort3 IDS Daemon Service

Loaded: loaded (/etc/systemd/system/snort3.service; enabled; preset: enabled)

Active: active (running) since Sat 2024-05-04 09:41:16 JST; 1min 52s ago

Main PID: 1658 (snort3)

Tasks: 2 (limit: 4556)

Memory: 288.9M (peak: 289.2M)

CPU: 4.633s

CGroup: /system.slice/snort3.service

mq1658 /usr/local/bin/snort -c /usr/local/etc/snort/snort.lua -s 65535 -k none -l /var/log/snort -D -i ens33 -m 0x1b -u snort -g snort

May 04 09:41:16 lepard snort[1658]: instances: 338

May 04 09:41:16 lepard snort[1658]: patterns: 10778

May 04 09:41:16 lepard snort[1658]: pattern chars: 175278

May 04 09:41:16 lepard snort[1658]: num states: 123344

May 04 09:41:16 lepard snort[1658]: num match states: 10498

May 04 09:41:16 lepard snort[1658]: memory scale: MB

May 04 09:41:16 lepard snort[1658]: total memory: 3.68713

May 04 09:41:16 lepard snort[1658]: pattern memory: 0.577984

May 04 09:41:16 lepard snort[1658]: match list memory: 1.33597

May 04 09:41:16 lepard snort[1658]: transition memory: 1.73192

10. Snort JSON logging configuration

①Edit Snort configuration file

# vi /usr/local/etc/snort/snort.lua

Add to end of line 281 "7. configure outputs section"

---------------------------------------------------------------------------

-- 7. configure outputs

---------------------------------------------------------------------------

---------------

-- additional logs

--packet_capture = { }

--file_log = { }

alert_json =

{

file = true,

limit = 50,

fields = 'timestamp msg pkt_num proto pkt_gen pkt_len dir src_addr src_port dst_addr dst_port service rule priority class action b64_data'

}

➁Restart Snort

1	# systemctl restart snort3

➂Checking the configuration
Ping command from another PC on the same network to the Ubuntu host server
A log is recorded and saved in the Snort alert_json.txt file. Check the log file

# tail -f /var/log/snort/alert_json.txt

The following log results are displayed
{ "timestamp" : "05/04-09:57:21.234382", "msg" : "Incoming ICMP", "pkt_num" : 879, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:21.234477", "msg" : "Incoming ICMP", "pkt_num" : 880, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:22.242861", "msg" : "Incoming ICMP", "pkt_num" : 991, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:22.242861", "msg" : "Incoming ICMP", "pkt_num" : 992, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:22.242912", "msg" : "Incoming ICMP", "pkt_num" : 993, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:22.242985", "msg" : "Incoming ICMP", "pkt_num" : 994, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:23.254556", "msg" : "Incoming ICMP", "pkt_num" : 1018, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:23.254557", "msg" : "Incoming ICMP", "pkt_num" : 1019, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:23.254611", "msg" : "Incoming ICMP", "pkt_num" : 1020, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }
{ "timestamp" : "05/04-09:57:23.254678", "msg" : "Incoming ICMP", "pkt_num" : 1021, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

# tail -f /var/log/snort/alert_json.txt

The following log results are displayed

{ "timestamp" : "05/04-09:57:21.234382", "msg" : "Incoming ICMP", "pkt_num" : 879, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:21.234477", "msg" : "Incoming ICMP", "pkt_num" : 880, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:22.242861", "msg" : "Incoming ICMP", "pkt_num" : 991, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:22.242861", "msg" : "Incoming ICMP", "pkt_num" : 992, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:22.242912", "msg" : "Incoming ICMP", "pkt_num" : 993, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:22.242985", "msg" : "Incoming ICMP", "pkt_num" : 994, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:23.254556", "msg" : "Incoming ICMP", "pkt_num" : 1018, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:23.254557", "msg" : "Incoming ICMP", "pkt_num" : 1019, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "C2S", "src_addr" : "192.168.11.22", "dst_addr" : "192.168.11.83", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:23.254611", "msg" : "Incoming ICMP", "pkt_num" : 1020, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

{ "timestamp" : "05/04-09:57:23.254678", "msg" : "Incoming ICMP", "pkt_num" : 1021, "proto" : "ICMP", "pkt_gen" : "raw", "pkt_len" : 60, "dir" : "S2C", "src_addr" : "192.168.11.83", "dst_addr" : "192.168.11.22", "service" : "unknown", "rule" : "1:1000001:1", "priority" : 0, "class" : "none", "action" : "allow", "b64_data" : "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dndhYmNkZWZnaGk=" }

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