{"id":"c598cc0c-9e70-4852-b9eb-8921af79f598","title":"Hacktool - EDR-Freeze Execution","description":"Detects execution of EDR-Freeze, a tool that exploits the MiniDumpWriteDump function and WerFaultSecure.exe to suspend EDR and Antivirus processes on Windows.\nEDR-Freeze leverages a race-condition attack to put security processes into a dormant state by suspending WerFaultSecure at the moment it freezes the target process.\nThis technique does not require kernel-level exploits or BYOVD, but instead abuses user-mode functionality to temporarily disable monitoring by EDR or Antimalware solutions.\n","author":"Swachchhanda Shrawan Poudel (Nextron Systems)","status":"experimental","level":"high","date":"2025-09-24","modified":"2025-11-27","tags":["attack.defense-impairment","attack.t1685"],"technique_ids":["T1685"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unlikely"],"references":["https://www.zerosalarium.com/2025/09/EDR-Freeze-Puts-EDRs-Antivirus-Into-Coma.html","https://github.com/TwoSevenOneT/EDR-Freeze"],"source_path":"rules/windows/process_creation/proc_creation_win_hktl_edr_freeze.yml","source_sha256":"c7c156456886c633baaa887908a61e8016c4e4dae23d1e8c5d59011b1ea00913","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_hktl_edr_freeze.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Hacktool - EDR-Freeze Execution\nid: c598cc0c-9e70-4852-b9eb-8921af79f598\nstatus: experimental\ndescription: |\n    Detects execution of EDR-Freeze, a tool that exploits the MiniDumpWriteDump function and WerFaultSecure.exe to suspend EDR and Antivirus processes on Windows.\n    EDR-Freeze leverages a race-condition attack to put security processes into a dormant state by suspending WerFaultSecure at the moment it freezes the target process.\n    This technique does not require kernel-level exploits or BYOVD, but instead abuses user-mode functionality to temporarily disable monitoring by EDR or Antimalware solutions.\nreferences:\n    - https://www.zerosalarium.com/2025/09/EDR-Freeze-Puts-EDRs-Antivirus-Into-Coma.html\n    - https://github.com/TwoSevenOneT/EDR-Freeze\nauthor: Swachchhanda Shrawan Poudel (Nextron Systems)\ndate: 2025-09-24\nmodified: 2025-11-27\ntags:\n    - attack.defense-impairment\n    - attack.t1685\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        Image|contains:\n            - '\\EDR-Freeze'\n            - '\\EDRFreeze'\n        Image|endswith: '.exe'\n    selection_imphash:\n        Hashes|contains:\n            - 'IMPHASH=1195F7935954A2CD09157390C33F8E8C'\n            - 'IMPHASH=129F58DE3D687FB7F012BF6C3D679997'\n            - 'IMPHASH=2C617A175D0086251642C6619F7CC8BA'\n            - 'IMPHASH=8828F0B906F7844358FB92A899E9520F'\n            - 'IMPHASH=AF76D95157EC554DC1EF178E4E66D447'\n            - 'IMPHASH=E1B04316B61ACA31DD52ABBEC0A37FD5'\n            - 'IMPHASH=8B2D5B54AFCFEC60D54F6B31D80ED4A0'\n            - 'IMPHASH=AB8BB31EDD91D2A05FE7B62A535E9EB7'\n    condition: 1 of selection_*\nfalsepositives:\n    - Unlikely\nlevel: high\nregression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_hktl_edr_freeze/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1685","id":"T1685","name":"Disable or Modify Tools","page":"techniques/enterprise/T1685/"}],"data_path":"data/detection-rules/c598cc0c-9e70-4852-b9eb-8921af79f598.json","kind":"sigma"}