FortiGate - VPN SSL Settings Modified

Description

Detects the modification of VPN SSL Settings (for example, the modification of authentication rules). This behavior was observed in pair with the addition of a VPN SSL Web Portal.

Query · sigma

selection:
  action: Edit
  cfgpath: vpn.ssl.settings
condition: selection

Known false positives

  • VPN SSL settings can be changed for legitimate purposes.
Raw source FortiGate - VPN SSL Settings Modified · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: FortiGate - VPN SSL Settings Modified
id: 8b5dacf2-aeb7-459d-b133-678eb696d410
status: experimental
description: |
    Detects the modification of VPN SSL Settings (for example, the modification of authentication rules).
    This behavior was observed in pair with the addition of a VPN SSL Web Portal.
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/114404382/config-vpn-ssl-settings
    - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/44546/44546-logid-event-config-attr
author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber)
date: 2025-11-01
tags:
    - attack.persistence
    - attack.initial-access
    - attack.t1133
logsource:
    product: fortigate
    service: event
detection:
    selection:
        action: 'Edit'
        cfgpath: 'vpn.ssl.settings'
    condition: selection
falsepositives:
    - VPN SSL settings can be changed for legitimate purposes.
level: medium

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