Sigma rule: FortiGate - VPN SSL Settings Modified

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-a8838533d31b, updated 2025-11-01T00:00:00.000Z.

Rule

Title
FortiGate - VPN SSL Settings Modified
Status
experimental
Level
medium
Author
Marco Pedrinazzi (@pedrinazziM) (InTheCyber)
Date
2025-11-01
File
rules/network/fortinet/fortigate/fortinet_fortigate_vpn_ssl_settings_modified.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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.

Log source

product
fortigate
service
event

Detection

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

False positives (as the rule lists them)

  • VPN SSL settings can be changed for legitimate purposes.

Tags

  • attack.persistence
  • attack.initial-access
  • attack.t1133

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/network/fortinet/fortigate/fortinet_fortigate_vpn_ssl_settings_modified.yml

Sources and licences

  • SigmaHQ

    "FortiGate - VPN SSL Settings Modified" by Marco Pedrinazzi (@pedrinazziM) (InTheCyber) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/network/fortinet/fortigate/fortinet_fortigate_vpn_ssl_settings_modified.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: FortiGate - VPN SSL Settings Modified",
entity page, dataset version ref-a8838533d31b, updated 2025-11-01T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/8b5dacf2-aeb7-459d-b133-678eb696d410 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 8b5dacf2-aeb7-459d-b133-678eb696d410, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.