FortiGate - VPN SSL Settings Modified

Title: FortiGate - VPN SSL Settings Modified
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
modified:None
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