title: Suspicious PowerShell Command Line
author: Teymur Kheirkhabarov (idea), Vasiliy Burov (rule), oscd.community
date: 2020/10/15
description: Detects the PowerShell command lines with special characters
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        Image: '*\powershell.exe'
    SELECTION_3:
        CommandLine|re: .*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*\+.*
    SELECTION_4:
        CommandLine|re: .*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*\{.*
    SELECTION_5:
        CommandLine|re: .*{.*{.*{.*{.*{.*
    SELECTION_6:
        CommandLine|re: .*\^.*\^.*\^.*\^.*\^.*
    SELECTION_7:
        CommandLine|re: .*`.*`.*`.*`.*`.*
    condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7))
falsepositives:
- Unlikely
id: d7bcd677-645d-4691-a8d4-7a5602b780d1
level: high
logsource:
    category: process_creation
    product: windows
references:
- https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=64
status: experimental
tags:
- attack.defense_evasion
- attack.t1027
- attack.execution
- attack.t1059.001
yml_filename: win_powershell_cmdline_special_characters.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation