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: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 33
References: None
Tags:
- Domain: Endpoint
- OS: Linux
- OS: macOS
- Use Case: Threat Detection
- Tactic: Privilege Escalation
- Data Source: Elastic Defend
Version: 103
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/PrivateFrameworks/PackageKit.framework/Versions/A/XPCServices/package_script_service.xpc/Contents/MacOS/package_script_service" OR "/var/lib/dpkg/info/whoopsie.postinst" )
Framework: 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/
-
Sub-technique:
- Name: Setuid and Setgid
- ID: T1548.001
- Reference URL: https://attack.mitre.org/techniques/T1548/001/
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/