Suspicious FortiGate - VPN SSL Settings Modified (via event)

title: Suspicious FortiGate - VPN SSL Settings Modified (via event)
id: 162e0f83-88a9-597f-a471-808eb2386c10
status: stable
description: This rule 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://attack.mitre.org/techniques/T1133/
    - 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: Huntrule Team
date: 2026-02-08
tags:
    - attack.persistence
    - attack.initial-access
    - attack.t1133
logsource:
    product: fortigate
    service: event
detection:
    selection:
        action: 'Edit'
        cfgpath: 'vpn.ssl.settings'
    condition: selection
falsepositives:
    - Unknown
level: medium