Query: write Sigma for Detects the modification of a user group on a Fortinet FortiGate Firewall. The group could be used to grant VPN access t
Matching passage: Sigma rule: Detects the modification of a user group on a Fortinet FortiGate Firewall. The group could be used to grant VPN access t. Logsource: fortigate / event. Rule: title: FortiGate - User Group Modified id: 69ffc84e-8b1a-4024-8351-e018f66b8275 status: experimental description: 'Detects the modification of a user group on a Fortinet FortiGate Firewall. The group could be used to grant VPN access to a network. ' 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/328136827/config-user-group - https://docs.fortinet.com/document/fortigate/7.6.4/fortios-log-message-reference/44547/44547-logid-event-config-objattr author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber) date: 2025-11-01 tags: - attack.persistence - attack.privilege-escalation logsource: product: fortigate service: event detection: selection: action: Edit cfgpath: user.group condition: selection falsepositives: - A group can be modified for legitimate purposes. level: medium
Near-miss passage: Sigma rule: Detects persistence via Visual Studio Tools for Office (VSTO) add-ins in Office applications.. Logsource: windows / registry_set. Rule: title: Potential Persistence Via Visual Studio Tools for Office id: 9d15044a-7cfe-4d23-8085-6ebc11df7685 status: test description: Detects persistence via Visual Studio Tools for Office (VSTO) add-ins in Office applications. references: - https://twitter.com/_vivami/status/1347925307643355138 - https://vanmieghem.io/stealth-outlook-persistence/ author: Bhabesh Raj date: 2021-01-10 modified: 2026-01-09 tags: - attack.t1137.006 - attack.persistence logsource: category: registry_set product: windows detection: selection: TargetObject|contains: - \Software\Microsoft\Office\Outlook\Addins\ - \Software\Microsoft\Office\Word\Addins\ - \Software\Microsoft\Office\Excel\Addins\ - \Software\Microsoft\Office\Powerpoint\Addins\ - \Software\Microsoft\VSTO\Security\Inclusion\ filter_main_system: Image: - C:\Windows\System32\msiexec.exe - C:\Windows\SysWOW64\msiexec.exe - C:\Windows\System32\regsvr32.exe - C:\Windows\SysWOW64\regsvr32.exe filter_main_office_click_to_run: Image|startswith: - C:\Program Files\Common Files (x86)\Microsoft Shared\ClickToRun\ - C:\Program Files\Common Files\Microsoft Shared\ClickToRun\ Image|endswith: \OfficeClickToRun.exe filter_main_integrator: Image: - C:\Program Files (x86)\Microsoft Office\root\integration\integrator.exe - C:\Program Files\Microsoft Office\root\integration\integrator.exe filter_main_office_apps: Image|startswith: - C:\Program Files\Microsoft Office\OFFICE - C:\Program Files (x86)\Microsoft Office\OFFICE - C:\Program Files\Microsoft Office\Root\OFFICE - C:\Program Files (x86)\Microsoft Office\Root\OFFICE - C:\PROGRA~2\MICROS~2\Office Image|endswith: - \excel.exe - \Integrator.exe - \OneNote.exe - \outlook.exe - \powerpnt.exe - \Teams.exe - \visio.exe - \winword.exe filter_main_vsto: Image|startswith: - C:\Program Files\Common Files\Microsoft Shared\VSTO\ - C:\Program Files (x86)\Microsoft Shared\VSTO\ Image|endswith: \VSTOInstaller.exe filter_optional_avg: Image: - C:\Program Files\AVG\Antivirus\RegSvr.exe - C:\Program Files (x86)\AVG\Antivirus\RegSvr.exe TargetObject|contains: \Microsoft\Office\Outlook\Addins\Antivirus.AsOutExt\ filter_optional_avast: Image: - C:\Program Files\Avast Software\Avast\RegSvr.exe - C:\Program Files (x86)\Avast Software\Avast\RegSvr.exe TargetObject|contains: \Microsoft\Office\Outlook\Addins\Avast.AsOutExt\ condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Legitimate Addin Installation level: medium