{"id":"74403157-20f5-415d-89a7-c505779585cf","title":"ConvertTo-SecureString Cmdlet Usage Via CommandLine","description":"Detects usage of the \"ConvertTo-SecureString\" cmdlet via the commandline. Which is fairly uncommon and could indicate potential suspicious activity","author":"Teymur Kheirkhabarov (idea), Vasiliy Burov (rule), oscd.community, Tim Shelton","status":"test","level":"medium","date":"2020-10-11","modified":"2023-02-01","tags":["attack.stealth","attack.t1027","attack.execution","attack.t1059.001"],"technique_ids":["T1027","T1059.001"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Legitimate use to pass password to different powershell commands"],"references":["https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=65","https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/convertto-securestring?view=powershell-7.3#examples"],"source_path":"rules/windows/process_creation/proc_creation_win_powershell_cmdline_convertto_securestring.yml","source_sha256":"27ee1982cf02e37a85fd0bb1680d6033d4c1b43f1872f08bebb039ba9645846a","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_powershell_cmdline_convertto_securestring.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: ConvertTo-SecureString Cmdlet Usage Via CommandLine\nid: 74403157-20f5-415d-89a7-c505779585cf\nstatus: test\ndescription: Detects usage of the \"ConvertTo-SecureString\" cmdlet via the commandline. Which is fairly uncommon and could indicate potential suspicious activity\nreferences:\n    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=65\n    - https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/convertto-securestring?view=powershell-7.3#examples\nauthor: Teymur Kheirkhabarov (idea), Vasiliy Burov (rule), oscd.community, Tim Shelton\ndate: 2020-10-11\nmodified: 2023-02-01\ntags:\n    - attack.stealth\n    - attack.t1027\n    - attack.execution\n    - attack.t1059.001\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith:\n              - '\\powershell.exe'\n              - '\\pwsh.exe'\n        - OriginalFileName:\n              - 'PowerShell.EXE'\n              - 'pwsh.dll'\n    selection_cli:\n        CommandLine|contains: 'ConvertTo-SecureString'\n    condition: all of selection_*\nfalsepositives:\n    - Legitimate use to pass password to different powershell commands\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1027","id":"T1027","name":"Obfuscated Files or Information","page":"techniques/enterprise/T1027/"},{"key":"enterprise/T1059.001","id":"T1059.001","name":"PowerShell","page":"techniques/enterprise/T1059.001/"}],"data_path":"data/detection-rules/74403157-20f5-415d-89a7-c505779585cf.json","kind":"sigma"}