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FortiGate - New Firewall Policy Added — Sigma Rule

Sigma rule f24ab7a8-f09a-4319-82c1-915586aa642b. FortiGate - New Firewall Policy Added — Sigma Rule. Detects the addition of a new firewall policy on a Fortinet FortiGate Firewall.

Rule metadata and linked tags

experimentalmediumfortigateeventattack.defense-impairmentattack.t1685

Author: Marco Pedrinazzi @pedrinazziM (InTheCyber). Source status: experimental; severity: medium. Source dates: 2025-11-01 / not supplied.

{
  "product": "fortigate",
  "service": "event"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 03994c6cc7a46bc0f0102402558004d225a5626ea8f06143353f9f524abda69c

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: FortiGate - New Firewall Policy Added
id: f24ab7a8-f09a-4319-82c1-915586aa642b
status: experimental
description: Detects the addition of a new firewall policy on a Fortinet FortiGate Firewall.
references:
    - https://www.fortiguard.com/psirt/FG-IR-24-535
    - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/398/event
    - https://docs.fortinet.com/document/fortigate/7.6.4/cli-reference/333889629/config-firewall-policy
    - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/44547/44547-logid-event-config-objattr
author: Marco Pedrinazzi @pedrinazziM (InTheCyber)
date: 2025-11-01
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: fortigate
    service: event
detection:
    selection:
        action: 'Add'
        cfgpath: 'firewall.policy'
    condition: selection
falsepositives:
    - A firewall policy can be added for legitimate purposes.
level: medium

Original YAML and metadata in JSON

False positives

  • A firewall policy can be added for legitimate purposes.

Source references

Connected ecosystem references

Exact source-tagged techniques

Telemetry review

Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.

Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.