Contents
Suricata
SURICATA IDS/IPS is an open source IDS that monitors communications on the network and detects suspicious traffic.
The 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.advance preparation
①Activate the EPEL Repository
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# dnf -y install epel-release |
②System updates
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# dnf update -y |
2.Suricata Installation and Configuration
①Suricata Install
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# dnf -y install suricata Check Version # suricata -V This is Suricata version 6.0.20 RELEASE |
②Determine interface and IP address where Suricata will inspect network packets
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# ip --brief add lo UNKNOWN 127.0.0.1/8 ::1/128 ens160 UP 192.168.11.83/24 |
③Edit configuration file
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# vi /etc/suricata/suricata.yaml # Line 15 : In the "vars" section, define the network HOME_NET: "[192.168.11.0/24]" EXTRNAL_NET: "!$HOME_NET" # Line 595 : Set interface name in "af-packet" section af-packet: - interface: ens160 |
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# vi /etc/sysconfig/suricata # Line 8 :Specify interface # Add options to be passed to the daemon OPTIONS="-i ens160 --user suricata " |
④Suricata rules update
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# suricata-update |
⑤Activate Suricata
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# systemctl enable --now suricata Created symlink /etc/systemd/system/multiuser.target.wants/suricata.service → /usr/lib/systemd/system/suricata.service. |
⑥Confirm Suricata startup
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# systemctl status suricata ● suricata.service - Suricata Intrusion Detection Service Loaded: loaded (/usr/lib/systemd/system/suricata.service; enabled; preset: disabled) Active: active (running) since Sat 2024-08-24 13:00:32 JST; 5s ago Docs: man:suricata(1) Process: 29135 ExecStartPre=/bin/rm -f /var/run/suricata.pid (code=exited, status=0/SUCCESS) Main PID: 29136 (Suricata-Main) Tasks: 1 (limit: 10900) Memory: 181.9M CPU: 5.847s CGroup: /system.slice/suricata.service mq29136 /sbin/suricata -c /etc/suricata/suricata.yaml --pidfile /var/run/suricata.pid -i ens160 --user suricata Aug 24 13:00:32 Lepard systemd[1]: Starting Suricata Intrusion Detection Service... Aug 24 13:00:32 Lepard systemd[1]: Started Suricata Intrusion Detection Service. Aug 24 13:00:32 Lepard suricata[29136]: 24/8/2024 -- 13:00:32 - <Notice> - This is Suricata version 6.0.20 RELEASE running in SYSTEM mode |
Check Log
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# tail /var/log/suricata/suricata.log 24/8/2024 -- 13:00:33 - <Info> - stats output device (regular) initialized: stats.log 24/8/2024 -- 13:00:33 - <Info> - Running in live mode, activating unix socket 24/8/2024 -- 13:00:45 - <Info> - 1 rule files processed. 39675 rules successfully loaded, 0 rules failed 24/8/2024 -- 13:00:45 - <Info> - Threshold config parsed: 0 rule(s) found 24/8/2024 -- 13:00:46 - <Info> - 39678 signatures processed. 1170 are IP-only rules, 4858 are inspecting packet payload, 33446 inspect application layer, 108 are decoder event only 24/8/2024 -- 13:00:54 - <Info> - Going to use 2 thread(s) 24/8/2024 -- 13:00:55 - <Info> - Running in live mode, activating unix socket 24/8/2024 -- 13:00:55 - <Info> - Using unix socket file '/var/run/suricata/suricata-command.socket' 24/8/2024 -- 13:00:55 - <Notice> - all 2 packet processing threads, 4 management threads initialized, engine started. 24/8/2024 -- 13:00:55 - <Info> - All AFP capture threads are running. |
Check the stats.log file for statistics (updated every 8 seconds by default)
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# tail -f /var/log/suricata/stats.log |
A more advanced output, EVE JSON, can be generated with the following command
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# tail -f /var/log/suricata/eve.json |
3.Suricata Testing
①Run ping test with curl utility
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# curl http://testmynids.org/uid/index.html uid=0(root) gid=0(root) groups=0(root) |
②Check the alert log to see if it has been logged
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# cat /var/log/suricata/fast.log 08/24/2024-13:02:10.840990 [**] [1:2100498:7] GPL ATTACK_RESPONSE id check returned root [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} 18.65.159.75:80 -> 192.168.11.83:37040 |
4.Setting Suricata Rules
①Display of rule sets packaged in Suricata
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# ls -al /var/lib/suricata/rules/ total 29724 drwxr-s--- 2 root suricata 57 Aug 24 13:00 . drwxrws--- 4 suricata suricata 33 Aug 24 13:00 .. -rw-r--r-- 1 root suricata 3228 Aug 24 13:00 classification.config -rw-r--r-- 1 root suricata 30432369 Aug 24 13:00 suricata.rules |
②Index list of sources providing rule sets
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# 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: 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: abuse.ch/sslbl-blacklist Vendor: Abuse.ch Summary: Abuse.ch SSL Blacklist License: CC0-1.0 Replaces: s, s, l, b, l, /, s, s, l, -, f, p, -, b, l, a, c, k, l, i, s, t Name: abuse.ch/sslbl-ja3 Vendor: Abuse.ch Summary: Abuse.ch Suricata JA3 Fingerprint Ruleset License: CC0-1.0 Replaces: s, s, l, b, l, /, j, a, 3, -, f, i, n, g, e, r, p, r, i, n, t, s Name: abuse.ch/sslbl-c2 Vendor: Abuse.ch Summary: Abuse.ch Suricata Botnet C2 IP Ruleset License: CC0-1.0 Name: abuse.ch/feodotracker Vendor: Abuse.ch Summary: Abuse.ch Feodo Tracker Botnet C2 IP ruleset License: CC0-1.0 Name: abuse.ch/urlhaus Vendor: abuse.ch Summary: Abuse.ch URLhaus Suricata Rules License: CC0-1.0 Name: etnetera/aggressive Vendor: Etnetera a.s. Summary: Etnetera aggressive IP blacklist License: MIT Name: tgreen/hunting Vendor: tgreen Summary: Threat hunting rules License: GPLv3 Name: malsilo/win-malware Vendor: malsilo Summary: Commodity malware rules License: MIT Name: stamus/lateral Vendor: Stamus Networks Summary: Lateral movement rules License: GPL-3.0-only Name: stamus/nrd-30-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 30 day list, complete License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: stamus/nrd-14-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 14 day list, complete License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: stamus/nrd-entropy-30-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 30 day list, high entropy License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: stamus/nrd-entropy-14-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 14 day list, high entropy License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: stamus/nrd-phishing-30-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 30 day list, phishing License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: stamus/nrd-phishing-14-open Vendor: Stamus Networks Summary: Newly Registered Domains Open only - 14 day list, phishing License: Commercial Parameters: secret-code Subscription: https://www.stamus-networks.com/stamus-labs/subscribe-to-threat-intel-feed Name: pawpatrules Vendor: pawpatrules Summary: PAW Patrules is a collection of rules for IDPS / NSM Suricata engine License: CC-BY-SA-4.0 |
③Enable source (if et/open is enabled)
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# suricata-update enable-source et/open 24/8/2024 -- 13:04:38 - <Info> -- Using data-directory /var/lib/suricata. 24/8/2024 -- 13:04:38 - <Info> -- Using Suricata configuration /etc/suricata/suricata.yaml 24/8/2024 -- 13:04:38 - <Info> -- Using /usr/share/suricata/rules for Suricata provided rules. 24/8/2024 -- 13:04:38 - <Info> -- Found Suricata version 6.0.20 at /usr/sbin/suricata. 24/8/2024 -- 13:04:38 - <Info> -- Creating directory /var/lib/suricata/update/sources 24/8/2024 -- 13:04:38 - <Info> -- Source et/open enabled |
Perform update
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# suricata-update |
Restart Suricata service
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# systemctl restart suricata |
5.Creating Suricata Custom Rules
①Create files containing customer rules
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# vi /etc/suricata/rules/local.rules Include the following information alert icmp any any -> $HOME_NET any (msg:"ICMP Ping"; sid:1; rev:1;) |
②Edit configuration file (define new rule paths)
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# vi /etc/suricata/suricata.yaml # Added around line 1969 default-rule-path: /var/lib/suricata/rules rule-files: - suricata.rules - /etc/suricata/rules/local.rules |
③Testing the configuration file
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# suricata -T -c /etc/suricata/suricata.yaml -v 24/8/2024 -- 13:06:27 - <Info> - Running suricata under test mode 24/8/2024 -- 13:06:27 - <Notice> - This is Suricata version 6.0.20 RELEASE running in SYSTEM mode 24/8/2024 -- 13:06:27 - <Info> - CPUs/cores online: 2 24/8/2024 -- 13:06:27 - <Info> - Setting engine mode to IDS mode by default 24/8/2024 -- 13:06:27 - <Info> - master exception-policy set to: auto 24/8/2024 -- 13:06:27 - <Info> - fast output device (regular) initialized: fast.log 24/8/2024 -- 13:06:27 - <Info> - eve-log output device (regular) initialized: eve.json 24/8/2024 -- 13:06:27 - <Info> - stats output device (regular) initialized: stats.log 24/8/2024 -- 13:06:39 - <Info> - 2 rule files processed. 39676 rules successfully loaded, 0 rules failed 24/8/2024 -- 13:06:39 - <Info> - Threshold config parsed: 0 rule(s) found 24/8/2024 -- 13:06:40 - <Info> - 39679 signatures processed. 1171 are IP-only rules, 4858 are inspecting packet payload, 33446 inspect application layer, 108 are decoder event only 24/8/2024 -- 13:06:49 - <Notice> - Configuration provided was successfully loaded. Exiting. 24/8/2024 -- 13:06:49 - <Info> - cleaning up signature grouping structure... complete |
Restart Suricata service
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# systemctl restart suricata |
④Testing the application of Custom Rules
Ping another device on the same local network to see if it was logged
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# cat /var/log/suricata/fast.log 08/24/2024-13:07:38.894788 [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.22:8 -> 192.168.11.83:0 08/24/2024-13:07:38.894829 [**] [1:1:1] ICMP Ping [**] [Classification: (null)] [Priority: 3] {ICMP} 192.168.11.83:0 -> 192.168.11.22:0 |
To get logs in JSON format, install jq on your system
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# dnf install jq |
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# systemctl restart suricata |
Execute the following command to ping another device on the same local network
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# tail -f /var/log/suricata/eve.json | jq 'select(.event_type=="alert")' When ping is executed, the following is displayed in the console { "timestamp": "2024-08-24T13:10:04.683809+0900", "flow_id": 1467332041666337, "in_iface": "ens160", "event_type": "alert", "src_ip": "192.168.11.22", "src_port": 0, "dest_ip": "192.168.11.83", "dest_port": 0, "proto": "ICMP", "icmp_type": 8, "icmp_code": 0, "alert": { "action": "allowed", "gid": 1, "signature_id": 1, "rev": 1, "signature": "ICMP Ping", "category": "", "severity": 3 }, "flow": { "pkts_toserver": 1, "pkts_toclient": 0, "bytes_toserver": 74, "bytes_toclient": 0, "start": "2024-08-24T13:10:04.683809+0900" } } { "timestamp": "2024-08-24T13:10:04.683873+0900", "flow_id": 1467332041666337, "in_iface": "ens160", "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, "alert": { "action": "allowed", "gid": 1, "signature_id": 1, "rev": 1, "signature": "ICMP Ping", "category": "", "severity": 3 }, "flow": { "pkts_toserver": 2, "pkts_toclient": 1, "bytes_toserver": 148, "bytes_toclient": 74, "start": "2024-08-24T13:10:04.683809+0900" } } |
Tripwire
1.Installation
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# dnf install -y tripwire |
2.Passphrase setting
Set site passphrase and local passphrase
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# tripwire-setup-keyfiles |
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---------------------------------------------- The Tripwire site and local passphrases are used to sign a variety of files, such as the configuration, policy, and database files. Passphrases should be at least 8 characters in length and contain both letters and numbers. See the Tripwire manual for more information. ---------------------------------------------- Creating key files... (When selecting a passphrase, keep in mind that good passphrases typically have upper and lower case letters, digits and punctuation marks, and are at least 8 characters in length.) Enter the site keyfile passphrase: ←Enter any "Site Passphrase" Verify the site keyfile passphrase: ←Enter "Site Passphrase" again Generating key (this may take several minutes)...Key generation complete. (When selecting a passphrase, keep in mind that good passphrases typically have upper and lower case letters, digits and punctuation marks, and are at least 8 characters in length.) Enter the local keyfile passphrase: ←Enter any "local passphrase" Verify the local keyfile passphrase: ←Enter "Local Passphrase" again Generating key (this may take several minutes)...Key generation complete. ---------------------------------------------- Signing configuration file... Please enter your site passphrase: ←Enter "Site Passphrase" Wrote configuration file: /etc/tripwire/tw.cfg A clear-text version of the Tripwire configuration file: /etc/tripwire/twcfg.txt has been preserved for your inspection. It is recommended that you move this file to a secure location and/or encrypt it in place (using a tool such as GPG, for example) after you have examined it. ---------------------------------------------- Signing policy file... Please enter your site passphrase: ←Enter "Site Passphrase" Wrote policy file: /etc/tripwire/tw.pol A clear-text version of the Tripwire policy file: /etc/tripwire/twpol.txt ～omission～ default values from the current configuration file are used. |
3.Tripwire Configuration
①Configuration File Edit
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# vi /etc/tripwire/twcfg.txt ●Line 9 : change LOOSEDIRECTORYCHECKING =true ●Line 12 : change Level 4 provides the most detailed report of the five levels from "0" to "4". #REPORTLEVEL =3 REPORTLEVEL =4 |
②Create a Tripwire configuration file (cryptographically signed version)
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# twadmin -m F -c /etc/tripwire/tw.cfg -S /etc/tripwire/site.key /etc/tripwire/twcfg.txt Please enter your site passphrase: ←Enter site passphrase Wrote configuration file: /etc/tripwire/tw.cfg |
③Delete Tripwire configuration file (text version)
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# rm -f /etc/tripwire/twcfg.txt |
④Policy File Settings
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# cd /etc/tripwire/ # vi twpolmake.pl |
Contents of twpolmake.pl
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#!/usr/bin/perl # Tripwire Policy File customize tool # $POLFILE=$ARGV[0]; open(POL,"$POLFILE") or die "open error: $POLFILE" ; my($myhost,$thost) ; my($sharp,$tpath,$cond) ; my($INRULE) = 0 ; while (<POL>) { chomp; if (($thost) = /^HOSTNAME\s*=\s*(.*)\s*;/) { $myhost = `hostname` ; chomp($myhost) ; if ($thost ne $myhost) { $_="HOSTNAME=\"$myhost\";" ; } } elsif ( /^{/ ) { $INRULE=1 ; } elsif ( /^}/ ) { $INRULE=0 ; } elsif ($INRULE == 1 and ($sharp,$tpath,$cond) = /^(\s*\#?\s*)(\/\S+)\b(\s+->\s+.+)$/) { $ret = ($sharp =~ s/\#//g) ; if ($tpath eq '/sbin/e2fsadm' ) { $cond =~ s/;\s+(tune2fs.*)$/; \#$1/ ; } if (! -s $tpath) { $_ = "$sharp#$tpath$cond" if ($ret == 0) ; } else { $_ = "$sharp$tpath$cond" ; } } print "$_\n" ; } close(POL) ; |
⑤Policy File Optimizations
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# perl /etc/tripwire/twpolmake.pl /etc/tripwire/twpol.txt > /etc/tripwire/twpol.txt.new |
⑥Create policy file (cryptographically signed version) based on optimized policy file
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# twadmin -m P -c /etc/tripwire/tw.cfg -p /etc/tripwire/tw.pol -S /etc/tripwire/site.key /etc/tripwire/twpol.txt.new Please enter your site passphrase: ←Enter site passphrase Wrote policy file: /etc/tripwire/tw.pol |
⑦Create database and check operation
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# tripwire -m i -s -c /etc/tripwire/tw.cfg Please enter your local passphrase: ←Enter local passphrase |
Create test files
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# echo test > /root/test.txt |
Check Tripwire operation
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# tripwire -m c -s -c /etc/tripwire/tw.cfg OK if it appears as follows Open Source Tripwire(R) 2.4.3.7 Integrity Check Report Report generated by: root Report created on: Sat 24 Aug 2024 01:16:28 PM JST Database last updated on: Never =============================================================================== Report Summary: =============================================================================== Host name: Lepard Host IP address: 192.168.11.83 Host ID: None Policy file used: /etc/tripwire/tw.pol Configuration file used: /etc/tripwire/tw.cfg Database file used: /var/lib/tripwire/Lepard.twd Command line used: tripwire -m c -s -c /etc/tripwire/tw.cfg =============================================================================== Rule Summary: =============================================================================== ------------------------------------------------------------------------------- Section: Unix File System ------------------------------------------------------------------------------- Rule Name Severity Level Added Removed Modified --------- -------------- ----- ------- -------- User binaries 66 0 0 0 Tripwire Binaries 100 0 0 0 Libraries 66 0 0 0 Operating System Utilities 100 0 0 0 File System and Disk Administraton Programs 100 0 0 0 Kernel Administration Programs 100 0 0 0 Networking Programs 100 0 0 0 System Administration Programs 100 0 0 0 Hardware and Device Control Programs 100 0 0 0 System Information Programs 100 0 0 0 (/sbin/runlevel) Application Information Programs 100 0 0 0 (/sbin/rtmon) Critical Utility Sym-Links 100 0 0 0 Shell Binaries 100 0 0 0 Critical system boot files 100 0 0 0 * Tripwire Data Files 100 1 0 0 System boot changes 100 0 0 0 OS executables and libraries 100 0 0 0 Security Control 100 0 0 0 Login Scripts 100 0 0 0 Critical configuration files 100 0 0 0 * Root config files 100 1 0 0 Invariant Directories 66 0 0 0 Temporary directories 33 0 0 0 Critical devices 100 0 0 0 (/proc/kcore) Total objects scanned: 40880 Total violations found: 2 =============================================================================== Object Summary: =============================================================================== ------------------------------------------------------------------------------- # Section: Unix File System ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Rule Name: Tripwire Data Files (/var/lib/tripwire) Severity Level: 100 ------------------------------------------------------------------------------- Added: "/var/lib/tripwire/Lepard.twd" ------------------------------------------------------------------------------- Rule Name: Root config files (/root) Severity Level: 100 ------------------------------------------------------------------------------- Added: "/root/test.txt" =============================================================================== Error Report: =============================================================================== No Errors ------------------------------------------------------------------------------- *** End of report *** Open Source Tripwire 2.4 Portions copyright 2000-2018 Tripwire, Inc. Tripwire is a registered trademark of Tripwire, Inc. This software comes with ABSOLUTELY NO WARRANTY; for details use --version. This is free software which may be redistributed or modified only under certain conditions; see COPYING for details. All rights reserved. |
Delete test files
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# rm -f /root/test.txt |
⑧Tripwire Scheduled Scripts
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# cd /var/www/system # vi tripwire.sh |
Contents of tripwire.sh
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#!/bin/bash PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin # Passphrase setting LOCALPASS= ←local passphrase SITEPASS= ←site passphrase cd /etc/tripwire # Tripwire check run tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" root # Policy File Update twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt perl twpolmake.pl twpol.txt > twpol.txt.new twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null rm -f twpol.txt* *.bak # Database Update rm -f /usr/local/tripwire/lib/tripwire/*.twd* tripwire -m i -s -c tw.cfg -P $LOCALPASS |
⑨Tripwire Autorun Script Execution Settings
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# chmod 700 tripwire.sh Add to cron # crontab -e 0 3 * * * /var/www/system/tripwire.sh |
Reference: Script for reporting results by e-mail
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#!/bin/bash PATH=/usr/sbin:/usr/bin:/bin:/usr/local/tripwire/sbin # Passphrase setting LOCALPASS=xxxxx # local passphrase SITEPASS=xxxxx # site passphrase #Specify e-mail address for notification MAIL="<your mailaddress> " cd /etc/tripwire # Tripwire check run tripwire -m c -s -c tw.cfg|mail -s "Tripwire(R) Integrity Check Report in `hostname`" $MAIL # Policy File Update twadmin -m p -c tw.cfg -p tw.pol -S site.key > twpol.txt perl twpolmake.pl twpol.txt > twpol.txt.new twadmin -m P -c tw.cfg -p tw.pol -S site.key -Q $SITEPASS twpol.txt.new > /dev/null rm -f twpol.txt* *.bak # Database update rm -f /usr/local/tripwire/lib/tripwire/*.twd* tripwire -m i -s -c tw.cfg -P $LOCALPASS |
Confirmation that the results of the tripwire execution are notified to the specified e-mail address
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# /var/www/system/tripwire.sh |
Chkrootkit
① Download and install chkrootkit
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# cd /usr/local/src # wget ftp://ftp.chkrootkit.org/pub/seg/pac/chkrootkit.tar.gz # tar xvf chkrootkit.tar.gz |
➁Create /root/bin directory and move chkrootkit command to that directory
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# mkdir -p /root/bin # mv chkrootkit-0.58b/chkrootkit /root/bin |
➂Check chkrootkit.
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# chkrootkit | grep INFECTED |
Checking `chsh'... INFECTED
If the above display appears, it is probably a false positive.
④Create chkrootkit periodic execution script and change permissions
Create chkrootkit execution script in a directory where it is automatically executed daily
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# vi /etc/cron.daily/chkrootkit |
Scheduled Script Contents
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#!/bin/bash PATH=/usr/bin:/bin:/root/bin LOG=/tmp/$(basename ${0}) # Run chkrootkit chkrootkit > $LOG 2>&1 # log output cat $LOG | logger -t $(basename ${0}) # SMTPS bindshell false positive response if [ ! -z "$(grep 465 $LOG)" ] && \ [ -z $(/usr/sbin/lsof -i:465|grep bindshell) ]; then sed -i '/465/d' $LOG fi # Support for Suckit false positives when updating upstart package if [ ! -z "$(grep Suckit $LOG)" ] && \ [ -z "$(rpm -V `rpm -qf /sbin/init`)" ]; then sed -i '/Suckit/d' $LOG fi # Send mail to root only when rootkit is detected [ ! -z "$(grep INFECTED $LOG)" ] && \ grep INFECTED $LOG | mail -s "chkrootkit report in `hostname`" root |
Add execution permission to chkrootkit execution script
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# chmod 700 /etc/cron.daily/chkrootkit |
⑥Backup commands used by chkrootkit
If the commands used by chkrootkit are tampered with, rootkit will not be detected.
Back up these commands.
If necessary, run chkrootkit with the backed up command
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# cd /root # mkdir /root/chkrootkit_cmd # cp `which --skip-alias awk cut echo egrep grep find head id ls netstat ps strings sed ssh uname` chkrootkit_cmd/ # ls -l /root/chkrootkit_cmd/ total 2784 -rwxr-xr-x 1 root root 714928 Aug 24 13:22 awk -rwxr-xr-x 1 root root 48768 Aug 24 13:22 cut -rwxr-xr-x 1 root root 36136 Aug 24 13:22 echo -rwxr-xr-x 1 root root 32 Aug 24 13:22 egrep -rwxr-xr-x 1 root root 291600 Aug 24 13:22 find -rwxr-xr-x 1 root root 158200 Aug 24 13:22 grep -rwxr-xr-x 1 root root 44656 Aug 24 13:22 head -rwxr-xr-x 1 root root 40472 Aug 24 13:22 id -rwxr-xr-x 1 root root 140752 Aug 24 13:22 ls -rwxr-xr-x 1 root root 161648 Aug 24 13:22 netstat -rwxr-xr-x 1 root root 144536 Aug 24 13:22 ps -rwxr-xr-x 1 root root 116744 Aug 24 13:22 sed -rwxr-xr-x 1 root root 863768 Aug 24 13:22 ssh -rwxr-xr-x 1 root root 32504 Aug 24 13:22 strings -rwxr-xr-x 1 root root 32232 Aug 24 13:22 uname |
⑦Run chkrootkit on the copied command
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# chkrootkit -p /root/chkrootkit_cmd | grep INFECTED |
If nothing is displayed, no problem.
⑧Compresses backed up commands
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# tar zcvf chkrootkit_cmd.tar.gz chkrootkit_cmd chkrootkit_cmd/ chkrootkit_cmd/awk chkrootkit_cmd/cut chkrootkit_cmd/echo chkrootkit_cmd/egrep chkrootkit_cmd/find chkrootkit_cmd/head chkrootkit_cmd/id chkrootkit_cmd/ls chkrootkit_cmd/netstat chkrootkit_cmd/ps chkrootkit_cmd/strings chkrootkit_cmd/sed chkrootkit_cmd/ssh chkrootkit_cmd/uname chkrootkit_cmd/grep |
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# ls -l total 1276 -rw-------. 1 root root 1200 Aug 22 22:08 anaconda-ks.cfg drwxr-xr-x 2 root root 24 Aug 24 13:21 bin drwxr-xr-x 2 root root 184 Aug 24 13:22 chkrootkit_cmd -rw-r--r-- 1 root root 1301582 Aug 24 13:23 chkrootkit_cmd.tar.gz drwx------ 3 root root 21 Aug 24 11:06 snap |
⑨Send chkrootkit use command (compressed version) to root by e-mail
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1 |
# echo|mail -a chkrootkit_cmd.tar.gz -s chkrootkit_cmd.tar.gz root |
⑩Download and save chkrootkit_cmd.tar.gz file to Windows
⑪Delete commands on the backed up server
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1 |
# rm -f chkrootkit_cmd.tar.gz |