{"id":"fb843269-508c-4b76-8b8d-88679db22ce7","title":"Suspicious Execution of Powershell with Base64","description":"Commandline to launch powershell with a base64 payload","author":"frack113","status":"test","level":"medium","date":"2022-01-02","modified":"2023-01-05","tags":["attack.execution","attack.t1059.001"],"technique_ids":["T1059.001"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.001/T1059.001.md#atomic-test-20---powershell-invoke-known-malicious-cmdlets","https://unit42.paloaltonetworks.com/unit42-pulling-back-the-curtains-on-encodedcommand-powershell-attacks/","https://mikefrobbins.com/2017/06/15/simple-obfuscation-with-powershell-using-base64-encoding/"],"source_path":"rules/windows/process_creation/proc_creation_win_powershell_encode.yml","source_sha256":"321cd98268d4365c1ee3182f0fb2c17b50feaf7419582fb2b253955750d540e1","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_powershell_encode.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 Execution of Powershell with Base64\nid: fb843269-508c-4b76-8b8d-88679db22ce7\nstatus: test\ndescription: Commandline to launch powershell with a base64 payload\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.001/T1059.001.md#atomic-test-20---powershell-invoke-known-malicious-cmdlets\n    - https://unit42.paloaltonetworks.com/unit42-pulling-back-the-curtains-on-encodedcommand-powershell-attacks/\n    - https://mikefrobbins.com/2017/06/15/simple-obfuscation-with-powershell-using-base64-encoding/\nauthor: frack113\ndate: 2022-01-02\nmodified: 2023-01-05\ntags:\n    - attack.execution\n    - attack.t1059.001\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith:\n            - \\powershell.exe\n            - \\pwsh.exe\n        CommandLine|contains:\n            - ' -e '\n            - ' -en '\n            - ' -enc '\n            - ' -enco'\n            - ' -ec '\n    filter_encoding:\n        CommandLine|contains: ' -Encoding '\n    filter_azure:\n        ParentImage|contains:\n            - 'C:\\Packages\\Plugins\\Microsoft.GuestConfiguration.ConfigurationforWindows\\'\n            - '\\gc_worker.exe'\n    condition: selection and not 1 of filter_*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1059.001","id":"T1059.001","name":"PowerShell","page":"techniques/enterprise/T1059.001/"}],"data_path":"data/detection-rules/fb843269-508c-4b76-8b8d-88679db22ce7.json","kind":"sigma"}