Setuid / Setgid Bit Set via chmod
editSetuid / Setgid Bit Set via chmod
editAn 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: 8 (version history)
Added (Elastic Stack release): 7.8.0
Last modified (Elastic Stack release): 7.13.0
Rule authors: Elastic
Rule license: Elastic License v2
Rule query
editevent.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}/) AND NOT process.args: ( /.*\/Applications\/VirtualBox.app\/.+/ OR /\/usr\/local\/lib\/python.+/ OR /\/var\/folders\/.+\/FP.*nstallHelper/ OR /\/Library\/Filesystems\/.+/ OR /\/usr\/lib\/virtualbox\/.+/ OR /\/Library\/Application.*/ OR "/run/postgresql" OR "/var/crash" OR "/var/run/postgresql" OR /\/usr\/bin\/.+/ OR /\/usr\/local\/share\/.+/ OR /\/Applications\/.+/ OR /\/usr\/libexec\/.+/ OR "/var/metrics" OR /\/var\/lib\/dpkg\/.+/ OR /\/run\/log\/journal\/.*/ OR \/Users\/*\/.minikube\/bin\/docker-machine-driver-hyperkit ) AND NOT process.parent.executable: ( /\/var\/lib\/docker\/.+/ OR "/System/Library/PrivateFrame works/PackageKit.framework/Versions/A/XPCServices/package_script_servi ce.xpc/Contents/MacOS/package_script_service" OR "/var/lib/dpkg/info/whoopsie.postinst" )
Threat mapping
editFramework: MITRE ATT&CKTM
-
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 8 (7.13.0 release)
-
-
Updated query, changed from:
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}/)
-
- 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
-