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Potential Shell via Web Server

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-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Version: 5 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.9.1

Rule authors: Elastic

Rule license: Elastic License

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

event.category:process and event.type:(start or process_started) and
process.name:(bash or dash) and user.name:(apache or nginx or www or
"www-data")

Framework: MITRE ATT&CK^TM

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

Version 5 (7.9.1 release)

Version 4 (7.9.0 release)

Updated query, changed from:

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

Version 3 (7.8.0 release)

Updated query, changed from:

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

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