Processes Executing with Unusual Command Lines

 1title: Processes Executing with Unusual Command Lines
 2id: 4108fe33-1d66-4111-a698-53b4ecc15dc4
 3status: experimental
 4description: |
 5    Detects powershell command lines used with a process name besides powershell. Part 
 6    of the RedCanary 2024 Threat Detection Report.    
 7references:
 8    - https://redcanary.com/threat-detection-report/techniques/rename-system-utilities/
 9author: RedCanary, Sigma formatting by Micah Babinski
10date: 2024/03/21
11tags:
12    - attack.defense_evasion
13    - attack.t1036
14    - attack.t1036.003
15logsource:
16    category: process_creation
17    product: windows
18detection:
19    selection:
20        CommandLine|contains:
21            - 'iex'
22            - 'invoke-expression'
23    filter:
24        Image|endswith: '\powershell.exe'
25    condition: selection and not filter
26falsepositives:
27    - Unknown
28level: low```

References

• Rename System Utilities - Red Canary Threat Detection Report

  

  Adversaries rename system utilities to circumvent security controls and bypass detection logic dependent on process names and process paths.

  
  Read More

Related rules

• Unexpected Internal Process Name
• Potential Homoglyph Attack Using Lookalike Characters
• Suspicious Use of Rcedit Utility to Alter Executable Metadata
• Command or Scripting Interpreter Creating EXE File
• File Creation of Executables in Temp Folders (Event 4663)