{"id":"8b5dacf2-aeb7-459d-b133-678eb696d410","title":"FortiGate - VPN SSL Settings Modified","description":"Detects the modification of VPN SSL Settings (for example, the modification of authentication rules).\nThis behavior was observed in pair with the addition of a VPN SSL Web Portal.\n","author":"Marco Pedrinazzi @pedrinazziM (InTheCyber)","status":"experimental","level":"medium","date":"2025-11-01","modified":"","tags":["attack.persistence","attack.initial-access","attack.t1133"],"technique_ids":["T1133"],"logsource":{"product":"fortigate","service":"event"},"falsepositives":["VPN SSL settings can be changed for legitimate purposes."],"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"],"source_path":"rules/network/fortinet/fortigate/fortinet_fortigate_vpn_ssl_settings_modified.yml","source_sha256":"0c5df7b64121425869ffd9da1fbdf195725d08d307fe500f1f20749f1384db2e","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/network/fortinet/fortigate/fortinet_fortigate_vpn_ssl_settings_modified.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: FortiGate - VPN SSL Settings Modified\nid: 8b5dacf2-aeb7-459d-b133-678eb696d410\nstatus: experimental\ndescription: |\n    Detects the modification of VPN SSL Settings (for example, the modification of authentication rules).\n    This behavior was observed in pair with the addition of a VPN SSL Web Portal.\nreferences:\n    - https://www.fortiguard.com/psirt/FG-IR-24-535\n    - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/398/event\n    - https://docs.fortinet.com/document/fortigate/7.6.4/cli-reference/114404382/config-vpn-ssl-settings\n    - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/44546/44546-logid-event-config-attr\nauthor: Marco Pedrinazzi @pedrinazziM (InTheCyber)\ndate: 2025-11-01\ntags:\n    - attack.persistence\n    - attack.initial-access\n    - attack.t1133\nlogsource:\n    product: fortigate\n    service: event\ndetection:\n    selection:\n        action: 'Edit'\n        cfgpath: 'vpn.ssl.settings'\n    condition: selection\nfalsepositives:\n    - VPN SSL settings can be changed for legitimate purposes.\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1133","id":"T1133","name":"External Remote Services","page":"techniques/enterprise/T1133/"}],"data_path":"data/detection-rules/8b5dacf2-aeb7-459d-b133-678eb696d410.json","kind":"sigma"}