{"id":"db1c21e4-cd66-4b4e-85ca-590f0780529c","title":"Windows Recovery Environment Disabled Via Reagentc","description":"Detects attempts to disable windows recovery environment using Reagentc.\nReAgentc.exe is a command-line tool in Windows used to manage the Windows Recovery Environment (WinRE).\nIt allows users to enable, disable, and configure WinRE, which is used for troubleshooting and repairing common boot issues.\n","author":"Daniel Koifman (KoifSec), Michael Vilshin","status":"experimental","level":"medium","date":"2025-07-31","modified":"","tags":["attack.impact","attack.t1490"],"technique_ids":["T1490"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Legitimate administrative activity"],"references":["https://www.elastic.co/security-labs/maas-appeal-an-infostealer-rises-from-the-ashes","https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/reagentc-command-line-options?view=windows-11"],"source_path":"rules/windows/process_creation/proc_creation_win_reagentc_disable_windows_recovery_environment.yml","source_sha256":"9d685dad1ea2864cfd81c7f300c177c6a18e003c8e3226a6a3683350a9982823","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_reagentc_disable_windows_recovery_environment.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Windows Recovery Environment Disabled Via Reagentc\nid: db1c21e4-cd66-4b4e-85ca-590f0780529c\nstatus: experimental\ndescription: |\n    Detects attempts to disable windows recovery environment using Reagentc.\n    ReAgentc.exe is a command-line tool in Windows used to manage the Windows Recovery Environment (WinRE).\n    It allows users to enable, disable, and configure WinRE, which is used for troubleshooting and repairing common boot issues.\nreferences:\n    - https://www.elastic.co/security-labs/maas-appeal-an-infostealer-rises-from-the-ashes\n    - https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/reagentc-command-line-options?view=windows-11\nauthor: Daniel Koifman (KoifSec), Michael Vilshin\ndate: 2025-07-31\ntags:\n    - attack.impact\n    - attack.t1490\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:   # Example command simulated:  reagentc /disable\n        - Image|endswith: '\\reagentc.exe'\n        - OriginalFileName: 'reagentc.exe'\n    selection_cli:\n        CommandLine|contains|windash: '/disable'\n    condition: all of selection_*\nfalsepositives:\n    - Legitimate administrative activity\nlevel: medium\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/db1c21e4-cd66-4b4e-85ca-590f0780529c.json","kind":"sigma"}