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MediumSigmaHQ Marco Pedrinazzi (@pedrinazziM) (InTheCyber)

FortiGate - New Local User Created

Detects the creation of a new local user on a Fortinet FortiGate Firewall. The new local user could be used for VPN connections.

Detection logic

Detection requirements

Platform: Containers ESXi Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: fortigate
Log source service: event

Known benign triggers

A local user can be created for legitimate purposes. Investigate the user details to determine if it is authorized.

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
docs.fortinet.com/document/fortigate/7.6.4/cli-reference/109120963/config-user-local	Unclassified	Only this detection cites it
docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/398/event	Unclassified	7
docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/44547/44547-logid-event-config-objattr	Unclassified	6
www.fortiguard.com/psirt/FG-IR-24-535	Unclassified	7

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