sigmahighHunting

Potentially Suspicious Execution From Parent Process In Public Folder

Detects a potentially suspicious execution of a parent process located in the "\Users\Public" folder executing a child process containing references to shell or scripting binaries and commandlines.

MITRE ATT&CK

T1564 T1059

defense-evasionexecution

Detection Query

selection_parent:
  ParentImage|contains: :\Users\Public\
selection_child:
  - Image|endswith:
      - \bitsadmin.exe
      - \certutil.exe
      - \cmd.exe
      - \cscript.exe
      - \mshta.exe
      - \powershell.exe
      - \pwsh.exe
      - \regsvr32.exe
      - \rundll32.exe
      - \wscript.exe
  - CommandLine|contains:
      - bitsadmin
      - certutil
      - cscript
      - mshta
      - powershell
      - regsvr32
      - rundll32
      - wscript
condition: all of selection_*

Author

Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)

Created

2022-02-25

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://redcanary.com/blog/blackbyte-ransomware/

Tags

attack.defense-evasionattack.executionattack.t1564attack.t1059

Raw Content

title: Potentially Suspicious Execution From Parent Process In Public Folder
id: 69bd9b97-2be2-41b6-9816-fb08757a4d1a
status: test
description: |
    Detects a potentially suspicious execution of a parent process located in the "\Users\Public" folder executing a child process containing references to shell or scripting binaries and commandlines.
references:
    - https://redcanary.com/blog/blackbyte-ransomware/
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2022-02-25
modified: 2024-07-12
tags:
    - attack.defense-evasion
    - attack.execution
    - attack.t1564
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|contains: ':\Users\Public\'
    selection_child:
        - Image|endswith:
              - '\bitsadmin.exe'
              - '\certutil.exe'
              - '\cmd.exe'
              - '\cscript.exe'
              - '\mshta.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
              - '\regsvr32.exe'
              - '\rundll32.exe'
              - '\wscript.exe'
        - CommandLine|contains:
              - 'bitsadmin'
              - 'certutil'
              - 'cscript'
              - 'mshta'
              - 'powershell'
              - 'regsvr32'
              - 'rundll32'
              - 'wscript'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high