huntrule

ScreenConnect RMM File Transfer Activity on Windows (Event ID 201)

Flags ScreenConnect RMM file transfer events on Windows based on provider name, Event ID 201, and transfer action text.

FreeUnreviewedSigmalowv1
title: ScreenConnect RMM File Transfer Activity on Windows (Event ID 201)
id: ceb66950-2882-408b-82d5-8c7e6cd0f22a
related:
  - id: b1f73849-6329-4069-bc8f-78a604bb8b23
    type: similar
  - id: 5d19eb78-5b5b-4ef2-a9f0-4bfa94d58a13
    type: derived
status: test
description: This rule identifies ScreenConnect RMM file transfer activity by matching Windows application logs for a specific ScreenConnect provider name and Event ID 201 with transfer-related action text. Attackers can use legitimate remote administration tooling to move files during staging, credential/tool deployment, or lateral movement. The detection relies on telemetry containing the provider name, event ID, and message content that includes the file transfer action phrase.
references:
  - https://www.huntandhackett.com/blog/revil-the-usage-of-legitimate-remote-admin-tooling
  - https://github.com/SigmaHQ/sigma/pull/4467
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/builtin/application/screenconnect/win_app_remote_access_tools_screenconnect_file_transfer.yml
author: Ali Alwashali, Huntrule Team
date: 2023-10-10
tags:
  - attack.execution
  - attack.t1059.003
logsource:
  service: application
  product: windows
detection:
  selection:
    Provider_Name: ScreenConnect
    EventID: 201
    Data|contains: Transferred files with action
  condition: selection
falsepositives:
  - Legitimate use of ScreenConnect
level: low
license: DRL-1.1

What it detects

This rule identifies ScreenConnect RMM file transfer activity by matching Windows application logs for a specific ScreenConnect provider name and Event ID 201 with transfer-related action text. Attackers can use legitimate remote administration tooling to move files during staging, credential/tool deployment, or lateral movement. The detection relies on telemetry containing the provider name, event ID, and message content that includes the file transfer action phrase.

Known false positives

  • Legitimate use of ScreenConnect

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.