Remote Access Tool - ScreenConnect Server Web Shell Execution — Sigma Rule

Rule metadata and linked tags

Author: Jason Rathbun (Blackpoint Cyber). Source status: test; severity: high. Source dates: 2024-02-26 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 3d9c714d5fc4af2e7900a680645ea06eb127bdca003644e986219fc3c6ee29d1

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 Server Web Shell Execution
id: b19146a3-25d4-41b4-928b-1e2a92641b1b
status: test
description: Detects potential web shell execution from the ScreenConnect server process.
references:
    - https://blackpointcyber.com/resources/blog/breaking-through-the-screen/
    - https://www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8
author: Jason Rathbun (Blackpoint Cyber)
date: 2024-02-26
tags:
    - attack.initial-access
    - attack.t1190
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        ParentImage|endswith: '\ScreenConnect.Service.exe'
        Image|endswith:
            - '\cmd.exe'
            - '\csc.exe'
    condition: selection
falsepositives:
    - Unlikely
level: high

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• https://blackpointcyber.com/resources/blog/breaking-through-the-screen/
• https://www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8