Remote Access Tool - ScreenConnect Temporary File

Status: test
Severity: low
Log source: category file_event, product windows
Author: Ali Alwashali
Source: github.com/SigmaHQ/sigma

Detects the creation of files in a specific location by ScreenConnect RMM. ScreenConnect has feature to remotely execute binaries on a target machine. These binaries will be dropped to ":\Users<username>\Documents\ConnectWiseControl\Temp" before execution.

Known false positives

Legitimate use of ScreenConnect

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.003` Command and Scripting Interpreter: Windows Command Shell

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 11: FileCreate

Rule body

title: Remote Access Tool - ScreenConnect Temporary File
id: 0afecb6e-6223-4a82-99fb-bf5b981e92a5
related:
    - id: b1f73849-6329-4069-bc8f-78a604bb8b23
      type: similar
status: test
description: |
    Detects the creation of files in a specific location by ScreenConnect RMM.
    ScreenConnect has feature to remotely execute binaries on a target machine. These binaries will be dropped to ":\Users\<username>\Documents\ConnectWiseControl\Temp\" before execution.
references:
    - https://github.com/SigmaHQ/sigma/pull/4467
author: Ali Alwashali
date: 2023-10-10
tags:
    - attack.execution
    - attack.t1059.003
logsource:
    category: file_event
    product: windows
detection:
    selection:
        Image|endswith: '\ScreenConnect.WindowsClient.exe'
        TargetFilename|contains: '\Documents\ConnectWiseControl\Temp\'
    condition: selection
falsepositives:
    - Legitimate use of ScreenConnect
# Note: Incase the level if ScreenConnect is not used
level: low

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: '\ScreenConnect.WindowsClient.exe'
    TargetFilename|contains: '\Documents\ConnectWiseControl\Temp\'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Image`	ends_with	`\ScreenConnect.WindowsClient.exe`	`field:"Image" kind:ends_with value:"\ScreenConnect.WindowsClient.exe"`
`TargetFilename`	match	`\Documents\ConnectWiseControl\Temp\`	`field:"TargetFilename" kind:match value:"\Documents\ConnectWiseControl\Temp\"`