{"id":"2d367498-5112-4ae5-a06a-96e7bc33a211","title":"Suspicious Binary Writes Via AnyDesk","description":"Detects AnyDesk writing binary files to disk other than \"gcapi.dll\".\nAccording to RedCanary research it is highly abnormal for AnyDesk to write executable files to disk besides gcapi.dll,\nwhich is a legitimate DLL that is part of the Google Chrome web browser used to interact with the Google Cloud API. (See reference section for more details)\n","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2022-09-28","modified":"2025-02-24","tags":["attack.command-and-control","attack.t1219.002"],"technique_ids":["T1219.002"],"logsource":{"product":"windows","category":"file_event"},"falsepositives":["Unknown"],"references":["https://redcanary.com/blog/misbehaving-rats/","https://thedfirreport.com/2025/02/24/confluence-exploit-leads-to-lockbit-ransomware/"],"source_path":"rules/windows/file/file_event/file_event_win_anydesk_writing_susp_binaries.yml","source_sha256":"a34368f66ca76bd9cd367497d259f6954d72dbada1a8b37b21835f4841979e11","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_event/file_event_win_anydesk_writing_susp_binaries.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 Binary Writes Via AnyDesk\nid: 2d367498-5112-4ae5-a06a-96e7bc33a211\nstatus: test\ndescription: |\n    Detects AnyDesk writing binary files to disk other than \"gcapi.dll\".\n    According to RedCanary research it is highly abnormal for AnyDesk to write executable files to disk besides gcapi.dll,\n    which is a legitimate DLL that is part of the Google Chrome web browser used to interact with the Google Cloud API. (See reference section for more details)\nreferences:\n    - https://redcanary.com/blog/misbehaving-rats/\n    - https://thedfirreport.com/2025/02/24/confluence-exploit-leads-to-lockbit-ransomware/\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-09-28\nmodified: 2025-02-24\ntags:\n    - attack.command-and-control\n    - attack.t1219.002\nlogsource:\n    product: windows\n    category: file_event\ndetection:\n    selection:\n        Image|endswith:\n            - '\\AnyDesk.exe'\n            - '\\AnyDeskMSI.exe'\n        TargetFilename|endswith:\n            - '.dll'\n            - '.exe'\n    filter_dlls:\n        TargetFilename|endswith: '\\gcapi.dll'\n    condition: selection and not 1 of filter_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1219.002","id":"T1219.002","name":"Remote Desktop Software","page":"techniques/enterprise/T1219.002/"}],"data_path":"data/detection-rules/2d367498-5112-4ae5-a06a-96e7bc33a211.json","kind":"sigma"}