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Active Rule
Suspicious Activity in Shell Commands
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Suspicious Activity in Shell Commands
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
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
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/linux/builtin/lnx_shell_susp_commands.yml