{"id":"37774c23-25a1-4adb-bb6d-8bb9fd59c0f8","title":"Suspicious Volume Shadow Copy Vssapi.dll Load","description":"Detects the image load of VSS DLL by uncommon executables","author":"frack113","status":"test","level":"high","date":"2022-10-31","modified":"2026-05-18","tags":["attack.impact","attack.t1490"],"technique_ids":["T1490"],"logsource":{"category":"image_load","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/ORCx41/DeleteShadowCopies"],"source_path":"rules/windows/image_load/image_load_dll_vssapi_susp_load.yml","source_sha256":"6d564b6f62383fe24c747194946781ad8cece0f07b26bde6cf9b95af32cfa4a7","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/image_load/image_load_dll_vssapi_susp_load.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Volume Shadow Copy Vssapi.dll Load\nid: 37774c23-25a1-4adb-bb6d-8bb9fd59c0f8\nrelated:\n    - id: 333cdbe8-27bb-4246-bf82-b41a0dca4b70 # vss_ps.dll\n      type: similar\n    - id: 48bfd177-7cf2-412b-ad77-baf923489e82 # vsstrace.dll\n      type: similar\nstatus: test\ndescription: Detects the image load of VSS DLL by uncommon executables\nreferences:\n    - https://github.com/ORCx41/DeleteShadowCopies\nauthor: frack113\ndate: 2022-10-31\nmodified: 2026-05-18\ntags:\n    - attack.impact\n    - attack.t1490\nlogsource:\n    category: image_load\n    product: windows\ndetection:\n    selection:\n        ImageLoaded|endswith: '\\vssapi.dll'\n    filter_main_windows:\n        - Image:\n              - 'C:\\Windows\\explorer.exe'\n              - 'C:\\Windows\\ImmersiveControlPanel\\SystemSettings.exe'\n        - Image|startswith:\n              - 'C:\\Windows\\System32\\'\n              - 'C:\\Windows\\SysWOW64\\'\n              - 'C:\\Windows\\Temp\\{' # Installers\n              - 'C:\\Windows\\WinSxS\\'\n              - 'C:\\$WinREAgent\\Scratch\\'\n    filter_main_program_files:\n        # When using this rule in your environment replace the \"Program Files\" folder by the exact applications you know use this. Examples would be software such as backup solutions\n        Image|startswith:\n            - 'C:\\Program Files\\'\n            - 'C:\\Program Files (x86)\\'\n    filter_main_null_image:\n        Image: null\n    filter_optional_programdata_packagecache:\n        # The following filter is required because of many FPs cause by:\n        #   C:\\ProgramData\\Package Cache\\{10c6cfdc-27af-43fe-bbd3-bd20aae88451}\\dotnet-sdk-3.1.425-win-x64.exe\n        #   C:\\ProgramData\\Package Cache\\{b9cfa33e-ace4-49f4-8bb4-82ded940990a}\\windowsdesktop-runtime-6.0.11-win-x86.exe\n        #   C:\\ProgramData\\Package Cache\\{50264ff2-ad47-4569-abc4-1c350f285fb9}\\aspnetcore-runtime-6.0.11-win-x86.exe\n        #   C:\\ProgramData\\Package Cache\\{2dcef8c3-1563-4149-a6ec-5b6c98500d7d}\\dotnet-sdk-6.0.306-win-x64.exe\n        #   etc.\n        Image|startswith: 'C:\\ProgramData\\Package Cache\\'\n    filter_optional_avira:\n        Image|contains|all:\n            - '\\temp\\is-'\n            - '\\avira_system_speedup.tmp'\n    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1490","id":"T1490","name":"Inhibit System Recovery","page":"techniques/enterprise/T1490/"}],"data_path":"data/detection-rules/37774c23-25a1-4adb-bb6d-8bb9fd59c0f8.json","kind":"sigma"}