Elastic high stable eql

Potential Linux Backdoor User Account Creation

Identifies the attempt to create a new backdoor user by setting the user's UID to 0. Attackers may alter a user's UID to 0 to establish persistence on a system.

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Detection Logic

process where host.os.type == "linux" and event.type == "start" and
event.action in ("exec", "exec_event", "start", "ProcessRollup2", "executed", "process_started") and
process.name == "usermod" and process.args in ("-u", "--uid") and process.args == "0" and
process.args in ("-o", "--non-unique")

Field Validations

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