Sigma rule: Invoke-Obfuscation STDIN+ Launcher - System

Rule

Title

Invoke-Obfuscation STDIN+ Launcher - System

Status

test

Level

high

Author

Jonathan Cheong, oscd.community

Date

2020-10-15

Modified

2022-11-29

File

rules/windows/builtin/system/service_control_manager/win_system_invoke_obfuscation_stdin_services.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects Obfuscated use of stdin to execute PowerShell

Log source

product

windows

service

system

Detection

selection_main:
    Provider_Name: 'Service Control Manager'
    EventID: 7045
    # ImagePath|re: 'cmd.{0,5}(?:\/c|\/r).+powershell.+(?:\$\{?input\}?|noexit).+\"'
    # Example 1: c:\windows\sYstEm32\CmD.eXE /C"echO\Invoke-Expression (New-Object Net.WebClient).DownloadString | POwersHELl -NoEXiT -"
    # Example 2: c:\WiNDOws\sysTEm32\cmd.EXe /C " ECHo Invoke-Expression (New-Object Net.WebClient).DownloadString | POwersHELl -nol ${EXEcUtIONCONTeXT}.INvOkEComMANd.InvOKEScRIPt( $InpUt )"
    ImagePath|contains|all:
        - 'cmd'
        - 'powershell'
    ImagePath|contains:
        - '/c'
        - '/r'
selection_other:
    - ImagePath|contains: 'noexit'
    - ImagePath|contains|all:
          - 'input'
          - '$'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.stealth
• attack.t1027
• attack.execution
• attack.t1059.001

MITRE ATT&CK ids this rule names

• T1027
• T1059.001

References

• https://github.com/SigmaHQ/sigma/issues/1009

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/system/service_control_manager/win_system_invoke_obfuscation_stdin_services.yml