IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Service Command Lateral Movement Shell Execution via Apple Scripting »

› › ›

Setuid / Setgid Bit Set via chmod

edit

Setuid / Setgid Bit Set via chmod

edit

An adversary may add the setuid or setgid bit to a file or directory in order to run a file with the privileges of the owning user or group. An adversary can take advantage of this to either do a shell escape or exploit a vulnerability in an application with the setuid or setgid bit to get code running in a different user’s context. Additionally, adversaries can use this mechanism on their own malware to make sure they’re able to execute in elevated contexts in the future.

Rule type: query

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5 minutes

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

Maximum alerts per execution: 33

Tags:

Elastic
Host
Linux
macOS
Threat Detection
Privilege Escalation

Version: 7 (version history)

Added (Elastic Stack release): 7.8.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

edit

event.category:process AND event.type:(start OR process_started) AND
process.name:chmod AND process.args:("+s" OR "u+s" OR /4[0-9]{3}/ OR
g+s OR /2[0-9]{3}/)

Threat mapping

edit

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/

Rule version history

edit

Version 7 (7.12.0 release)

Rule name changed from: Setuid Bit Set via chmod

Updated query, changed from:

event.category:process AND event.type:(start or process_started) AND
process.name:chmod AND process.args:(u+s OR /4[0-9]{3}/) AND NOT
user.name:root

Version 6 (7.11.2 release)

Formatting only

Version 5 (7.11.0 release)

Formatting only

Version 4 (7.10.0 release)

Formatting only

Version 3 (7.9.1 release)

Formatting only

Version 2 (7.9.0 release)

Updated query, changed from:

event.action:(executed OR process_started) AND process.name:chmod AND
process.args:(u+s OR /4[0-9]{3}/) AND NOT user.name:root

« Service Command Lateral Movement Shell Execution via Apple Scripting »