{"id":"724ea201-6514-4f38-9739-e5973c34f49a","title":"Bypass UAC Using SilentCleanup Task","description":"Detects the setting of the environement variable \"windir\" to a non default value.\nAttackers often abuse this variable in order to trigger a UAC bypass via the \"SilentCleanup\" task.\nThe SilentCleanup task located in %windir%\\system32\\cleanmgr.exe is an auto-elevated task that can be abused to elevate any file with administrator privileges without prompting UAC.\n","author":"frack113, Nextron Systems","status":"test","level":"high","date":"2022-01-06","modified":"2024-01-30","tags":["attack.privilege-escalation","attack.t1548.002"],"technique_ids":["T1548.002"],"logsource":{"category":"registry_set","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.002/T1548.002.md#atomic-test-9---bypass-uac-using-silentcleanup-task","https://www.reddit.com/r/hacking/comments/ajtrws/bypassing_highest_uac_level_windows_810/","https://www.fortinet.com/blog/threat-research/enter-the-darkgate-new-cryptocurrency-mining-and-ransomware-campaign"],"source_path":"rules/windows/registry/registry_set/registry_set_bypass_uac_using_silentcleanup_task.yml","source_sha256":"a08281aa43d30f511df06d3142677a2a14bd7fd1c5aefe99b13260e3b3d8c470","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_bypass_uac_using_silentcleanup_task.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Bypass UAC Using SilentCleanup Task\nid: 724ea201-6514-4f38-9739-e5973c34f49a\nstatus: test\ndescription: |\n    Detects the setting of the environement variable \"windir\" to a non default value.\n    Attackers often abuse this variable in order to trigger a UAC bypass via the \"SilentCleanup\" task.\n    The SilentCleanup task located in %windir%\\system32\\cleanmgr.exe is an auto-elevated task that can be abused to elevate any file with administrator privileges without prompting UAC.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.002/T1548.002.md#atomic-test-9---bypass-uac-using-silentcleanup-task\n    - https://www.reddit.com/r/hacking/comments/ajtrws/bypassing_highest_uac_level_windows_810/\n    - https://www.fortinet.com/blog/threat-research/enter-the-darkgate-new-cryptocurrency-mining-and-ransomware-campaign\nauthor: frack113, Nextron Systems\ndate: 2022-01-06\nmodified: 2024-01-30\ntags:\n    - attack.privilege-escalation\n    - attack.t1548.002\nlogsource:\n    category: registry_set\n    product: windows\ndetection:\n    selection:\n        TargetObject|endswith: '\\Environment\\windir'\n    filter_main_default:\n        Details: '%SystemRoot%'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Unknown\nlevel: high\nregression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_bypass_uac_using_silentcleanup_task/info.yml\nsimulation:\n    - type: atomic-red-team\n      name: Bypass UAC using SilentCleanup Task\n      technique: T1548.002\n      atomic_guid: 28104f8a-4ff1-4582-bcf6-699dce156608\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1548.002","id":"T1548.002","name":"Bypass User Account Control","page":"techniques/enterprise/T1548.002/"}],"data_path":"data/detection-rules/724ea201-6514-4f38-9739-e5973c34f49a.json","kind":"sigma"}