Elastic low stable kql

Unusual Exim4 Child Process

This rule detects the execution of unusual commands via a descendant process of exim4. Attackers may use descendant processes of exim4 to evade detection and establish persistence or execute post-exploitation commands on a target system.

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Detection Logic

host.os.type:linux and event.type:start and event.action:exec and process.parent.name:exim4 and
not process.name:(
  exim4 or start-stop-daemon or run-parts or systemctl or update-exim4.conf or install or plymouth or
  readlink or grep or stat or cmake or gcc or cppcheck or sort or sshd
)

Field Validations

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