Potential Shell via Web Server

IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

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

Rule type: query

Rule indices:

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum signals per execution: 100

References:

Tags:

Version: 2 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.6.1

Network monitoring or management products may have a web server component that runs shell commands as part of normal behavior.

process.name:bash and user.name:(apache or www or www-data) and
event.action:executed

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/techniques/TA0003/
Technique:
- Name: Web Shell
- ID: T1100
- Reference URL: https://attack.mitre.org/techniques/T1100/

Version 2 (7.6.1 release)

Updated query, changed from:

process.name: bash and user.name: (apache or www or "wwww-data") and
event.action:executed