Remote Access Tool - ScreenConnect Potential Suspicious Remote Command Execution — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems), @Kostastsale. Source status: test; severity: medium. Source dates: 2022-02-25 / 2024-02-28.

{
  "product": "windows",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f899c2d70066d2b05dec7ca628b6fec544c0a1393fefab9ab5a996802b8b7d24

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Remote Access Tool - ScreenConnect Potential Suspicious Remote Command Execution
id: 7b582f1a-b318-4c6a-bf4e-66fe49bf55a5
related:
    - id: d1a401ab-8c47-4e86-a7d8-2460b6a53e4a
      type: derived
status: test
description: |
    Detects potentially suspicious child processes launched via the ScreenConnect client service.
references:
    - https://www.mandiant.com/resources/telegram-malware-iranian-espionage
    - https://docs.connectwise.com/ConnectWise_Control_Documentation/Get_started/Host_client/View_menu/Backstage_mode
    - https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708
    - https://www.trendmicro.com/en_us/research/24/b/threat-actor-groups-including-black-basta-are-exploiting-recent-.html
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems), @Kostastsale
date: 2022-02-25
modified: 2024-02-28
tags:
    - attack.command-and-control
    - attack.t1219.002
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        ParentCommandLine|contains|all:
            - ':\Windows\TEMP\ScreenConnect\'
            - 'run.cmd'
        Image|endswith:
            - '\bitsadmin.exe'
            - '\cmd.exe'
            - '\curl.exe'
            - '\dllhost.exe'
            - '\net.exe'
            - '\nltest.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\rundll32.exe'
            - '\wevtutil.exe'
    condition: selection
falsepositives:
    - If the script being executed make use of any of the utilities mentioned in the detection then they should filtered out or allowed.
level: medium

Original YAML and metadata in JSON

False positives

• If the script being executed make use of any of the utilities mentioned in the detection then they should filtered out or allowed.

Source references

• https://www.mandiant.com/resources/telegram-malware-iranian-espionage
• https://docs.connectwise.com/ConnectWise_Control_Documentation/Get_started/Host_client/View_menu/Backstage_mode
• https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708
• https://www.trendmicro.com/en_us/research/24/b/threat-actor-groups-including-black-basta-are-exploiting-recent-.html