LoFP LoFP / legitimate addin installation

Techniques

Sample rules

Potential Persistence Via Visual Studio Tools for Office

Description

Detects persistence via Visual Studio Tools for Office (VSTO) add-ins in Office applications.

Detection logic

condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
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|endswith:
  - \excel.exe
  - \Integrator.exe
  - \outlook.exe
  - \powerpnt.exe
  - \Teams.exe
  - \visio.exe
  - \winword.exe
  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
filter_main_office_click_to_run:
  Image|endswith: \OfficeClickToRun.exe
  Image|startswith:
  - C:\Program Files\Common Files (x86)\Microsoft Shared\ClickToRun\
  - C:\Program Files\Common Files\Microsoft Shared\ClickToRun\
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_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\
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\
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\