{"id":"0fc35fc3-efe6-4898-8a37-0b233339524f","title":"Suspicious ScreenSave Change by Reg.exe","description":"Adversaries may establish persistence by executing malicious content triggered by user inactivity.\nScreensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension\n","author":"frack113","status":"test","level":"medium","date":"2021-08-19","modified":"2022-06-02","tags":["attack.persistence","attack.privilege-escalation","attack.t1546.002"],"technique_ids":["T1546.002"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["GPO"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.002/T1546.002.md","https://www.welivesecurity.com/wp-content/uploads/2017/08/eset-gazer.pdf"],"source_path":"rules/windows/process_creation/proc_creation_win_reg_screensaver.yml","source_sha256":"b180226abb0f2222bdd27ed017118ba90d6dc9d59ab40cfd2f51b6c9062a8072","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_reg_screensaver.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 ScreenSave Change by Reg.exe\nid: 0fc35fc3-efe6-4898-8a37-0b233339524f\nstatus: test\ndescription: |\n    Adversaries may establish persistence by executing malicious content triggered by user inactivity.\n    Screensavers are programs that execute after a configurable time of user inactivity and consist of Portable Executable (PE) files with a .scr file extension\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1546.002/T1546.002.md\n    - https://www.welivesecurity.com/wp-content/uploads/2017/08/eset-gazer.pdf\nauthor: frack113\ndate: 2021-08-19\nmodified: 2022-06-02\ntags:\n    - attack.persistence\n    - attack.privilege-escalation\n    - attack.t1546.002\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_reg:\n        Image|endswith: '\\reg.exe'\n        CommandLine|contains:\n            - 'HKEY_CURRENT_USER\\Control Panel\\Desktop'\n            - 'HKCU\\Control Panel\\Desktop'\n    selection_option_1: # /force Active ScreenSaveActive\n        CommandLine|contains|all:\n            - '/v ScreenSaveActive'\n            - '/t REG_SZ'\n            - '/d 1'\n            - '/f'\n    selection_option_2: # /force  set ScreenSaveTimeout\n        CommandLine|contains|all:\n            - '/v ScreenSaveTimeout'\n            - '/t REG_SZ'\n            - '/d '\n            - '/f'\n    selection_option_3: # /force set ScreenSaverIsSecure\n        CommandLine|contains|all:\n            - '/v ScreenSaverIsSecure'\n            - '/t REG_SZ'\n            - '/d 0'\n            - '/f'\n    selection_option_4: # /force set a .scr\n        CommandLine|contains|all:\n            - '/v SCRNSAVE.EXE'\n            - '/t REG_SZ'\n            - '/d '\n            - '.scr'\n            - '/f'\n    condition: selection_reg and 1 of selection_option_*\nfalsepositives:\n    - GPO\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1546.002","id":"T1546.002","name":"Screensaver","page":"techniques/enterprise/T1546.002/"}],"data_path":"data/detection-rules/0fc35fc3-efe6-4898-8a37-0b233339524f.json","kind":"sigma"}