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Detection rules › Sigma

FortiGate - New Firewall Policy Added

Status
experimental
Severity
medium
Log source
product fortigate, service event
Author
Marco Pedrinazzi (@pedrinazziM) (InTheCyber)
Source
github.com/SigmaHQ/sigma

Detects the addition of a new firewall policy on a Fortinet FortiGate Firewall.

Known false positives

  • A firewall policy can be added for legitimate purposes.

MITRE ATT&CK coverage

TacticTechniques
Defense Impairment

Rule body

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
modified: 2026-05-04
tags:
    - attack.defense-impairment
    - attack.t1686.002
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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    action: 'Add'
    cfgpath: 'firewall.policy'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
actioneq
  • Add
field:"action" kind:eq value:"Add"
cfgpatheq
  • firewall.policy
field:"cfgpath" kind:eq value:"firewall.policy"