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Potential Remote Code Execution via Web Server

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Potential Remote Code Execution via Web Server

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Identifies suspicious commands executed via a web server, which may suggest a vulnerability and remote shell access.

Rule type: eql

Rule indices:

logs-endpoint.events.*
endgame-*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Persistence
Tactic: Initial Access
Data Source: Elastic Endgame
Use Case: Vulnerability

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "linux" and event.type == "start" and
event.action in ("exec", "exec_event") and process.parent.executable : (
  "/usr/sbin/nginx", "/usr/local/sbin/nginx",
  "/usr/sbin/apache", "/usr/local/sbin/apache",
  "/usr/sbin/apache2", "/usr/local/sbin/apache2",
  "/usr/sbin/php*", "/usr/local/sbin/php*",
  "/usr/sbin/lighttpd", "/usr/local/sbin/lighttpd",
  "/usr/sbin/hiawatha", "/usr/local/sbin/hiawatha",
  "/usr/local/bin/caddy",
  "/usr/local/lsws/bin/lswsctrl",
  "*/bin/catalina.sh"
) and
process.name : ("*sh", "python*", "perl", "php*", "tmux") and
process.args : ("whoami", "id", "uname", "cat", "hostname", "ip", "curl", "wget", "pwd")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Server Software Component
- ID: T1505
- Reference URL: https://attack.mitre.org/techniques/T1505/
Sub-technique:
- Name: Web Shell
- ID: T1505.003
- Reference URL: https://attack.mitre.org/techniques/T1505/003/
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Exploit Public-Facing Application
- ID: T1190
- Reference URL: https://attack.mitre.org/techniques/T1190/

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