{"id":"85d23b42-9a9d-4f8f-b3d7-d2733c1d58f5","title":"HackTool - HollowReaper Execution","description":"Detects usage of HollowReaper, a process hollowing shellcode launcher used for stealth payload execution through process hollowing.\nIt replaces the memory of a legitimate process with custom shellcode, allowing the attacker to execute payloads under the guise of trusted binaries.\n","author":"Swachchhanda Shrawan Poudel (Nextron Systems)","status":"experimental","level":"high","date":"2025-07-01","modified":"","tags":["attack.privilege-escalation","attack.stealth","attack.t1055.012"],"technique_ids":["T1055.012"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/vari-sh/RedTeamGrimoire/tree/b5e7635d34db6e1f0398d8847e8f293186e947c5/HollowReaper"],"source_path":"rules/windows/process_creation/proc_creation_win_hktl_hollowreaper.yml","source_sha256":"22259875a4fc82b03c134e6caeded89b7af5b5d2bf034696d65925aa79bb917c","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_hktl_hollowreaper.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 - HollowReaper Execution\nid: 85d23b42-9a9d-4f8f-b3d7-d2733c1d58f5\nstatus: experimental\ndescription: |\n    Detects usage of HollowReaper, a process hollowing shellcode launcher used for stealth payload execution through process hollowing.\n    It replaces the memory of a legitimate process with custom shellcode, allowing the attacker to execute payloads under the guise of trusted binaries.\nreferences:\n    - https://github.com/vari-sh/RedTeamGrimoire/tree/b5e7635d34db6e1f0398d8847e8f293186e947c5/HollowReaper\nauthor: Swachchhanda Shrawan Poudel (Nextron Systems)\ndate: 2025-07-01\ntags:\n    - attack.privilege-escalation\n    - attack.stealth\n    - attack.t1055.012\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\HollowReaper.exe'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1055.012","id":"T1055.012","name":"Process Hollowing","page":"techniques/enterprise/T1055.012/"}],"data_path":"data/detection-rules/85d23b42-9a9d-4f8f-b3d7-d2733c1d58f5.json","kind":"sigma"}