XWorm V6 is a sophisticated remote access Trojan (RAT) that has gained rapid traction among threat actors since its release on June 4, 2025. The malware is primarily delivered through malicious JavaScript files that execute PowerShell scripts, which in turn deploy an injector to install the XWorm client on victim systems. This multi-stage infection chain allows the malware to evade traditional detection mechanisms by leveraging script-based execution and AMSI (Antimalware Scan Interface) bypass techniques. The malware incorporates a range of capabilities including remote desktop access, file management, credential harvesting, and process injection (notably process hollowing and thread injection), enabling attackers to maintain persistent and stealthy control over compromised hosts. The use of PowerShell and JavaScript as delivery and execution vectors aligns with common phishing campaigns, increasing the likelihood of successful initial compromise. The malware’s modular design allows it to load pivotal plugins that extend its functionality, making it adaptable to different operational needs. Although there are no known exploits in the wild targeting specific vulnerabilities, the threat relies heavily on social engineering and script execution to infiltrate environments. The tags associated with the threat (e.g., T1012, T1027, T1036, T1041, T1055, T1056, T1057, T1059) correspond to MITRE ATT&CK techniques such as system information discovery, obfuscated files or information, masquerading, command and control, process injection, input capture, system service discovery, and command-line interface usage, highlighting the malware’s comprehensive attack lifecycle. The absence of affected versions and patch links indicates that this is a malware campaign rather than a software vulnerability. The threat is documented by AlienVault and analyzed in detail by Trellix researchers, providing actionable intelligence for defenders.

For European organizations, XWorm V6 poses significant risks primarily through unauthorized remote access and data exfiltration. The malware’s ability to bypass AMSI and execute obfuscated PowerShell scripts complicates detection and response efforts, potentially allowing attackers to maintain long-term persistence. Confidentiality is at risk due to credential theft and file management capabilities, while integrity and availability may be compromised through remote desktop control and process injection, which can be used to manipulate or disrupt critical systems. Sectors such as finance, healthcare, government, and critical infrastructure in Europe are particularly vulnerable due to their reliance on Windows-based environments and remote management tools. The phishing-based delivery vector increases the attack surface, especially in organizations with less mature email security and user awareness programs. The medium severity rating reflects the malware’s potent capabilities balanced against the need for user interaction and the absence of zero-day exploits. However, the rapid adoption of XWorm V6 by threat actors suggests a growing threat landscape that could escalate if combined with targeted campaigns or supply chain compromises.

European organizations should implement layered defenses focusing on detection and prevention of script-based attacks. Specific recommendations include: 1) Enforce strict PowerShell execution policies, such as constrained language mode and script signing requirements, to limit unauthorized script execution. 2) Deploy advanced endpoint detection and response (EDR) solutions capable of identifying AMSI bypass attempts, process injection, and anomalous remote desktop sessions. 3) Harden email gateways with robust phishing detection, sandboxing, and URL filtering to block malicious JavaScript attachments and links. 4) Conduct regular user training focused on phishing awareness and safe handling of email attachments. 5) Monitor network traffic for unusual command and control patterns associated with XWorm’s communication techniques. 6) Implement application whitelisting to restrict execution of unauthorized scripts and binaries. 7) Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. 8) Utilize threat intelligence feeds to stay informed about emerging XWorm variants and indicators of compromise. These measures, combined with proactive hunting for suspicious PowerShell and JavaScript activity, will reduce the risk and impact of XWorm V6 infections.