PaperCut MF/NG Potential Exploitation

Description

Detects suspicious child processes of "pc-app.exe". Which could indicate potential exploitation of PaperCut

Query · sigma

selection:
  ParentImage|endswith: \pc-app.exe
  Image|endswith:
  - \bash.exe
  - \calc.exe
  - \certutil.exe
  - \cmd.exe
  - \csc.exe
  - \cscript.exe
  - \dllhost.exe
  - \mshta.exe
  - \msiexec.exe
  - \powershell.exe
  - \pwsh.exe
  - \regsvr32.exe
  - \rundll32.exe
  - \scriptrunner.exe
  - \wmic.exe
  - \wscript.exe
  - \wsl.exe
condition: selection

Known false positives

  • Legitimate administration activity
Raw source PaperCut MF/NG Potential Exploitation · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: PaperCut MF/NG Potential Exploitation
id: 0934ac71-a331-4e98-a034-d49c491fbbcb
status: test
description: Detects suspicious child processes of "pc-app.exe". Which could indicate potential exploitation of PaperCut
references:
    - https://www.huntress.com/blog/critical-vulnerabilities-in-papercut-print-management-software
    - https://github.com/huntresslabs/threat-intel/blob/3bad6b0fadfcca3ff5680923e74e39edd72f32da/2023/2023-04/20-PaperCut/win_susp_papercut_code_execution.yml
author: Nasreddine Bencherchali (Nextron Systems), Huntress DE&TH Team (idea)
date: 2023-04-20
modified: 2023-04-25
tags:
    - attack.execution
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\pc-app.exe'
        Image|endswith:
            - '\bash.exe'
            - '\calc.exe'
            - '\certutil.exe'
            - '\cmd.exe'
            - '\csc.exe'
            - '\cscript.exe'
            - '\dllhost.exe'
            - '\mshta.exe'
            - '\msiexec.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\regsvr32.exe'
            - '\rundll32.exe'
            - '\scriptrunner.exe'
            - '\wmic.exe'
            - '\wscript.exe'
            - '\wsl.exe'
    condition: selection
falsepositives:
    - Legitimate administration activity
level: high

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