title: CrackMapExec PowerShell Obfuscation
author: Thomas Patzke
date: 2020/05/22
description: The CrachMapExec pentesting framework implements a PowerShell obfuscation
    with some static strings detected by this rule.
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        CommandLine: '*powershell.exe*'
    SELECTION_3:
        CommandLine: '*join*split*'
    SELECTION_4:
        CommandLine: '*( $ShellId[1]+$ShellId[13]+''x'')*'
    SELECTION_5:
        CommandLine: '*( $PSHome[*]+$PSHOME[*]+*'
    SELECTION_6:
        CommandLine: '*( $env:Public[13]+$env:Public[5]+''x'')*'
    SELECTION_7:
        CommandLine: '*( $env:ComSpec[4,*,25]-Join'''')*'
    SELECTION_8:
        CommandLine: '*[1,3]+''x''-Join'''')*'
    condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7 or SELECTION_8))
falsepositives:
- Unknown
fields:
- ComputerName
- User
- CommandLine
id: 6f8b3439-a203-45dc-a88b-abf57ea15ccf
level: high
logsource:
    category: process_creation
    product: windows
references:
- https://github.com/byt3bl33d3r/CrackMapExec
- https://github.com/byt3bl33d3r/CrackMapExec/blob/0a49f75347b625e81ee6aa8c33d3970b5515ea9e/cme/helpers/powershell.py#L242
status: experimental
tags:
- attack.execution
- attack.t1059.001
- attack.defense_evasion
- attack.t1027.005
- attack.t1027
- attack.t1086
yml_filename: win_susp_crackmapexec_powershell_obfuscation.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation