Screenconnect
Table of Contents
Overview
ScreenConnect (ConnectWise ScreenConnect, classified across security telemetry as Tool:Win32/ScreenConnect and RemoteAccess:Win32/ScreenConnect) is a legitimate remote desktop and IT management software suite that is extensively weaponized and abused by cybercrime syndicates and ransomware cartels (e.g., BlackCat/ALPHV, LockBit, Play, and BianLian). Threat actors abuse exposed ConnectWise ScreenConnect instances or weaponize critical remote code execution vulnerabilities (such as CVE-2024-1709 and CVE-2024-1708) to deploy unauthorized ScreenConnect client agents. The tool provides operators with high-privilege interactive desktop access, file transfer, and remote command execution, effectively serving as an unblockable, legitimate-appearing backdoor to facilitate enterprise-wide ransomware deployment.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1219 | Remote Access Software | Command and Control | ATT&CK ↗ |
T1543.003 | Create or Modify System Process: Windows Service | Persistence | ATT&CK ↗ |
T1105 | Ingress Tool Transfer (Deploying the RMM) | Command and Control | ATT&CK ↗ |
T1059.003 | Command and Scripting Interpreter: Windows Command Shell | Execution | ATT&CK ↗ |
T1036 | Masquerading (Hiding in legitimate traffic) | Defense Evasion | ATT&CK ↗ |
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1036: Monitor for executable files running from unusual paths or with deceptive names. Use EDR to detect process masquerading.
- T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
- T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-PMA | Process Lineage & Masquerade Analysis | Detect | T1036 | Verify digital code-signing signatures and compare executable paths against known Windows binaries. |
D3-PBA | Process Spawn Analysis | Detect | T1059.003 | Inspect command-line arguments and anomalous parent-child relationships spawning from cmd.exe. |
D3-NTI | Network Traffic Inspection | Detect | T1105 | Inspect deep packet payloads for anomalous staging binaries and unauthorized egress protocols. |
D3-RASC | Remote Access Software Restrictions | Harden | T1219 | Block unapproved remote monitoring and management (RMM) tools (e.g. AnyDesk, TeamViewer) via AppLocker. |
D3-SCM | Windows Service Creation Monitoring | Detect | T1543.003 | Verify service binary image signatures and restrict standard users from creating or modifying service definitions. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_SCREENCONNECT_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Screenconnect"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "screenconnect" ascii wide nocase
$s2 = "tool:win32/screenconnect" ascii wide nocase
$s3 = "remoteaccess:win32/screenconnect" ascii wide nocase
$s4 = "screenconnect remote access" ascii wide nocase
$s5 = "connectwise screenconnect abuse" ascii wide nocase
$s6 = "hacktool:win32/screenconnect" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Screenconnect (Hacktool) Execution & Triage
id: 9d83e979-d7cd-5f4d-8aa4-1c4331575850
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Screenconnect malware family. Detects suspicious execution from temporary
user directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/screenconnect
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.hacktool
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1219
- attack.t1190
- attack.t1059_003
- attack.t1059_001
- attack.t1543_003
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \cscript.exe
- \wscript.exe
CommandLine|contains:
- AppData\Local\Temp
- -WindowStyle Hidden
- /e:jscript
- bitsadmin /transfer
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: mediumTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_SCREENCONNECT_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Screenconnect tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "screenconnect" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- Isolate the endpoint immediately; an unauthorized RMM installation means an attacker currently has interactive, remote control of the machine.
- Use the `sc stop` and `sc delete` commands to halt and remove the unauthorized ScreenConnect Windows service.
- Review firewall and proxy logs to identify the specific ScreenConnect instance/URL the client was communicating with, and block it enterprise-wide.
- Initiate a hunt across the network for lateral movement, as attackers frequently use RMM tools on a 'beachhead' machine to pivot to Domain Controllers.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not assume ScreenConnect traffic is safe simply because your IT department uses it; verify the specific instance ID and ensure the installation was authorized.
- Avoid trying to uninstall the tool via the Control Panel while the attacker is active; use EDR to kill the service forcefully to sever their connection.
References & External Analysis
- CISA Alert (AA24-054A) - Threat Actors Exploiting ConnectWise ScreenConnect Vulnerabilities
- Microsoft Defender Threat Encyclopedia - Tool:Win32/ScreenConnect
- MITRE ATT&CK - Remote Access Software (T1219)
- CISA Advisory: https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-054a
- Search "screenconnect" on VirusTotal (External Analysis)
- Search "screenconnect" on Any.Run (Sandbox Sandbox)
- Search "screenconnect" on MalwareBazaar (Malware Samples)
North American Authority Advisory (CISA / NIST)
The Cybersecurity and Infrastructure Security Agency (CISA) has published an official US federal advisory on this family, which can be mapped to NIST Cybersecurity Framework (CSF) incident response controls: https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-054a ↗
Frequently Asked Questions
What is Tool:Win32/ScreenConnect?
ScreenConnect is a legitimate remote management tool frequently weaponized by ransomware cartels as a covert backdoor for lateral movement.
Why do ransomware operators favor ScreenConnect over custom RATs?
Because it is a digitally signed, legitimate administrative utility that bypasses standard antivirus and firewall egress blocks.
Which vulnerabilities in ScreenConnect have threat actors exploited?
Threat actors extensively exploited authentication bypass and remote code execution flaws (CVE-2024-1709 and CVE-2024-1708).
What actions can attackers perform via compromised ScreenConnect?
Execute arbitrary shell commands with SYSTEM privileges, transfer secondary tools, and deploy enterprise ransomware.
How can defenders detect unauthorized ScreenConnect instances?
Audit running ScreenConnect Client services, monitor connections to unauthorized relay servers, and patch ScreenConnect servers immediately.
How do I remove the Screenconnect Hacktool from Windows?
Manual removal of Screenconnect is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Screenconnect a virus or a Hacktool?
Screenconnect is classified as a Hacktool. Unlike traditional viruses that infect files, modern malware like Screenconnect typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Screenconnect infection?
Symptoms of Screenconnect can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Hacktools
Want to prevent Screenconnect and similar threats from compromising your organization? Read our comprehensive defensive guide: HackTool & Riskware Protection.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/screenconnect.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.