sigmamediumHunting

Potentially Suspicious Child Process of KeyScrambler.exe

Detects potentially suspicious child processes of KeyScrambler.exe

MITRE ATT&CK

persistenceexecutiondefense-evasionprivilege-escalation

Detection Query

selection_parent:
  ParentImage|endswith: \KeyScrambler.exe
selection_binaries:
  - Image|endswith:
      - \cmd.exe
      - \cscript.exe
      - \mshta.exe
      - \powershell.exe
      - \pwsh.exe
      - \regsvr32.exe
      - \rundll32.exe
      - \wscript.exe
  - OriginalFileName:
      - Cmd.Exe
      - cscript.exe
      - mshta.exe
      - PowerShell.EXE
      - pwsh.dll
      - regsvr32.exe
      - RUNDLL32.EXE
      - wscript.exe
condition: all of selection_*

Author

Swachchhanda Shrawan Poudel

Created

2024-05-13

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://twitter.com/DTCERT/status/1712785421845790799

Tags

attack.persistenceattack.executionattack.defense-evasionattack.privilege-escalationattack.t1203attack.t1574.001

Raw Content

title: Potentially Suspicious Child Process of KeyScrambler.exe
id: ca5583e9-8f80-46ac-ab91-7f314d13b984
related:
    - id: d2451be2-b582-4e15-8701-4196ac180260
      type: similar
status: test
description: Detects potentially suspicious child processes of KeyScrambler.exe
references:
    - https://twitter.com/DTCERT/status/1712785421845790799
author: Swachchhanda Shrawan Poudel
date: 2024-05-13
tags:
    - attack.persistence
    - attack.execution
    - attack.defense-evasion
    - attack.privilege-escalation
    - attack.t1203
    - attack.t1574.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|endswith: '\KeyScrambler.exe'
    selection_binaries:
        # Note: add additional binaries that the attacker might use
        - Image|endswith:
              - '\cmd.exe'
              - '\cscript.exe'
              - '\mshta.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
              - '\regsvr32.exe'
              - '\rundll32.exe'
              - '\wscript.exe'
        - OriginalFileName:
              - 'Cmd.Exe'
              - 'cscript.exe'
              - 'mshta.exe'
              - 'PowerShell.EXE'
              - 'pwsh.dll'
              - 'regsvr32.exe'
              - 'RUNDLL32.EXE'
              - 'wscript.exe'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium