Query: alert when Detects presence of a potentially xor encoded powershell command
Matching passage: Sigma rule: Detects presence of a potentially xor encoded powershell command. Logsource: windows / process_creation. Rule: title: Suspicious XOR Encoded PowerShell Command id: bb780e0c-16cf-4383-8383-1e5471db6cf9 related: - id: 5b572dcf-254b-425c-a8c5-d9af6bea35a6 type: obsolete status: test description: Detects presence of a potentially xor encoded powershell command references: - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=65 - https://redcanary.com/blog/yellow-cockatoo/ - https://zero2auto.com/2020/05/19/netwalker-re/ - https://mez0.cc/posts/cobaltstrike-powershell-exec/ author: Sami Ruohonen, Harish Segar, Tim Shelton, Teymur Kheirkhabarov, Vasiliy Burov, oscd.community, Nasreddine Bencherchali date: 2018-09-05 modified: 2023-01-30 tags: - attack.execution - attack.stealth - attack.t1059.001 - attack.t1140 - attack.t1027 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll - Description: Windows PowerShell - Product: PowerShell Core 6 selection_cli_xor: CommandLine|contains: bxor selection_cli_other: CommandLine|contains: - ForEach - for( - 'for ' - '-join ' - -join' - -join" - -join` - ::Join - '[char]' condition: all of selection_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects modification of Windows Registry Classes keys used for persistence. Adversaries modify these autostart extensibi. Logsource: windows / registry_set. Rule: title: Classes Autorun Keys Modification id: 9df5f547-c86a-433e-b533-f2794357e242 related: - id: 17f878b8-9968-4578-b814-c4217fc5768c type: obsolete status: test description: 'Detects modification of Windows Registry Classes keys used for persistence. Adversaries modify these autostart extensibility points (ASEP) to execute malicious code when file types are opened or actions are performed. Various legitimate software also uses these keys. Currently, this rule only filters out known legitimate software paths, thus it is recommended to review and tune filters for your environment to reduce false positives before deploying to production. ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.001/T1547.001.md - https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns - https://gist.github.com/GlebSukhodolskiy/0fc5fa5f482903064b448890db1eaf9d author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split) date: 2019-10-25 modified: 2025-10-22 tags: - attack.privilege-escalation - attack.persistence - attack.t1547.001 logsource: category: registry_set product: windows detection: selection_classes_base: TargetObject|contains: \Software\Classes selection_classes_target: TargetObject|contains: - \Folder\ShellEx\ExtShellFolderViews - \Folder\ShellEx\DragDropHandlers - \Folder\Shellex\ColumnHandlers - \Filter - \Exefile\Shell\Open\Command\(Default) - \Directory\Shellex\DragDropHandlers - \Directory\Shellex\CopyHookHandlers - \CLSID\{AC757296-3522-4E11-9862-C17BE5A1767E}\Instance - \CLSID\{ABE3B9A4-257D-4B97-BD1A-294AF496222E}\Instance - \CLSID\{7ED96837-96F0-4812-B211-F13C24117ED3}\Instance - \CLSID\{083863F1-70DE-11d0-BD40-00A0C911CE86}\Instance - \Classes\AllFileSystemObjects\ShellEx\DragDropHandlers - \.exe - \.cmd - \ShellEx\PropertySheetHandlers - \ShellEx\ContextMenuHandlers filter_main_drivers: Image: C:\Windows\System32\drvinst.exe filter_main_empty: Details: (Empty) filter_main_null: Details: null filter_main_svchost: Image: C:\Windows\System32\svchost.exe TargetObject|contains: \lnkfile\shellex\ContextMenuHandlers\ filter_optional_msoffice: Details: '{807583E5-5146-11D5-A672-00B0D022E945}' condition: all of selection_* and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason - Legitimate admi