MediumSigmaHQ Tuan Le (NCSGroup)

User Has Been Deleted Via Userdel

Detects execution of the "userdel" binary. Which is used to delete a user account and related files. This is sometimes abused by threat actors in order to cover their tracks

Detection logic

Detection requirements

Platform: ESXi IaaS Linux macOS Office Suite SaaS Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: linux
Log source category: process_creation

Known benign triggers

Legitimate administrator activities

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
linux.die.net/man/8/userdel	Unclassified	Only this detection cites it
linuxize.com/post/how-to-delete-group-in-linux/	Unclassified	2
www.cyberciti.biz/faq/linux-remove-user-command/	Unclassified	2
www.cybrary.it/blog/0p3n/linux-commands-used-attackers/	Unclassified	2

Detection rules

User Has Been Deleted Via Userdel

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules