Sigma Rule Library

ScreenConnect - SlashAndGrab Exploitation Indicators

Detects indicators of exploitation by threat actors during exploitation of the "SlashAndGrab" vulnerability related to ScreenConnect as reported Team Huntress

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Detection logic

selection

- TargetFilename|contains|all:
    - C:\Windows\Temp\ScreenConnect\
    - \LB3.exe
- TargetFilename|contains:
    - C:\mpyutd.msi
    - C:\perflogs\RunSchedulerTaskOnce.ps1
    - C:\ProgramData\1.msi
    - C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\mpyutd.msi
    - C:\ProgramData\update.dat
    - C:\Users\oldadmin\Documents\MilsoftConnect\Files\ta.exe
    - C:\Windows\Help\Help\SentinelAgentCore.dll
    - C:\Windows\Help\Help\SentinelUI.exe
    - C:\Windows\spsrv.exe
    - C:\Windows\Temp\svchost.exe

Condition

selection

Raw YAML

title: ScreenConnect - SlashAndGrab Exploitation Indicators
id: 05164d17-8e11-4d7d-973e-9e4962436b87
status: test
description: |
    Detects indicators of exploitation by threat actors during exploitation of the "SlashAndGrab" vulnerability related to ScreenConnect as reported Team Huntress
references:
    - https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708
author: Nasreddine Bencherchali (Nextron Systems)
date: 2024-02-23
tags:
    - detection.emerging-threats
    - attack.stealth
logsource:
    product: windows
    category: file_event
detection:
    selection:
        - TargetFilename|contains|all:
              - 'C:\Windows\Temp\ScreenConnect\'
              - '\LB3.exe'
        - TargetFilename|contains:
              - 'C:\mpyutd.msi'
              - 'C:\perflogs\RunSchedulerTaskOnce.ps1'
              - 'C:\ProgramData\1.msi'
              - 'C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup\mpyutd.msi'
              - 'C:\ProgramData\update.dat'
              - 'C:\Users\oldadmin\Documents\MilsoftConnect\Files\ta.exe'
              - 'C:\Windows\Help\Help\SentinelAgentCore.dll'
              - 'C:\Windows\Help\Help\SentinelUI.exe'
              - 'C:\Windows\spsrv.exe'
              - 'C:\Windows\Temp\svchost.exe'
    condition: selection
falsepositives:
    - Unknown
level: high

False positives

  • Unknown

References

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