Suspicious Activity in Shell Commands

Description

Detects suspicious shell commands used in various exploit codes (see references)

Query · sigma

keywords:
- wget * - http* | perl
- wget * - http* | sh
- wget * - http* | bash
- python -m SimpleHTTPServer
- -m http.server
- import pty; pty.spawn*
- socat exec:*
- socat -O /tmp/*
- socat tcp-connect*
- '*echo binary >>*'
- '*wget *; chmod +x*'
- '*wget *; chmod 777 *'
- '*cd /tmp || cd /var/run || cd /mnt*'
- '*stop;service iptables stop;*'
- '*stop;SuSEfirewall2 stop;*'
- chmod 777 2020*
- '*>>/etc/rc.local'
- '*base64 -d /tmp/*'
- '* | base64 -d *'
- '*/chmod u+s *'
- '*chmod +s /tmp/*'
- '*chmod u+s /tmp/*'
- '* /tmp/haxhax*'
- '* /tmp/ns_sploit*'
- nc -l -p *
- cp /bin/ksh *
- cp /bin/sh *
- '* /tmp/*.b64 *'
- '*/tmp/ysocereal.jar*'
- '*/tmp/x *'
- '*; chmod +x /tmp/*'
- '*;chmod +x /tmp/*'
condition: keywords

Known false positives

  • Unknown
Raw source Suspicious Activity in Shell Commands · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Suspicious Activity in Shell Commands
id: 2aa1440c-9ae9-4d92-84a7-a9e5f5e31695
status: test
description: Detects suspicious shell commands used in various exploit codes (see references)
references:
    - https://web.archive.org/web/20170319121015/http://www.threatgeek.com/2017/03/widespread-exploitation-attempts-using-cve-2017-5638.html
    - https://github.com/rapid7/metasploit-framework/blob/eb6535009f5fdafa954525687f09294918b5398d/modules/exploits/multi/http/struts_code_exec_exception_delegator.rb
    - http://pastebin.com/FtygZ1cg
    - https://artkond.com/2017/03/23/pivoting-guide/
author: Florian Roth (Nextron Systems)
date: 2017-08-21
modified: 2021-11-27
tags:
    - attack.execution
    - attack.t1059.004
logsource:
    product: linux
detection:
    keywords:
        # Generic suspicious commands
        - 'wget * - http* | perl'
        - 'wget * - http* | sh'
        - 'wget * - http* | bash'
        - 'python -m SimpleHTTPServer'
        - '-m http.server'      # Python 3
        - 'import pty; pty.spawn*'
        - 'socat exec:*'
        - 'socat -O /tmp/*'
        - 'socat tcp-connect*'
        - '*echo binary >>*'
        # Malware
        - '*wget *; chmod +x*'
        - '*wget *; chmod 777 *'
        - '*cd /tmp || cd /var/run || cd /mnt*'
        # Apache Struts in-the-wild exploit codes
        - '*stop;service iptables stop;*'
        - '*stop;SuSEfirewall2 stop;*'
        - 'chmod 777 2020*'
        - '*>>/etc/rc.local'
        # Metasploit framework exploit codes
        - '*base64 -d /tmp/*'
        - '* | base64 -d *'
        - '*/chmod u+s *'
        - '*chmod +s /tmp/*'
        - '*chmod u+s /tmp/*'
        - '* /tmp/haxhax*'
        - '* /tmp/ns_sploit*'
        - 'nc -l -p *'
        - 'cp /bin/ksh *'
        - 'cp /bin/sh *'
        - '* /tmp/*.b64 *'
        - '*/tmp/ysocereal.jar*'
        - '*/tmp/x *'
        - '*; chmod +x /tmp/*'
        - '*;chmod +x /tmp/*'
    condition: keywords
falsepositives:
    - Unknown
level: high

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