A critical security flaw in WinRAR, tracked as CVE-2025-8088, is under active exploitation by the Russia-linked hacking group RomCom. The vulnerability allows malicious .rar archives to extract files into unintended system paths-such as the Startup folder-leading to automatic malware execution upon reboot.
Because WinRAR does not have an auto-update function, this flaw remains a significant threat to users who have not manually updated to version 7.13 or later.
How the Exploit Works
- The flaw leverages a path traversal vulnerability, allowing crafted archives to place malicious payloads in sensitive locations without the user’s awareness.
- Threat actors use alternate data streams (ADS) to mask malicious files and bypass basic detection.
- RomCom targeted financial services, manufacturing, defense, and logistics sectors between mid and late July 2025.
- Another group, known as Paper Werewolf, has also exploited the flaw, suggesting the method is circulating among multiple cybercriminal groups.
Why This Matters
WinRAR remains a widely used utility, particularly in enterprise workflows. The lack of auto-update capability means many systems could remain exposed indefinitely-making them prime targets for phishing campaigns disguised as job offers, invoices, or official documents.
The risks include:
- Persistent malware installation
- Privilege escalation
- Network-wide compromise
- Data theft and ransomware deployment
Recommended Actions
- Update Immediately – Manually install WinRAR 7.13 or later from the official website.
- Block Risky Attachments – Flag .rar files in inbound email, particularly those from unverified senders.
- Monitor Startup Folders – Detect and investigate suspicious executables placed in startup paths.
- Simulate Archive Exploits – Train employees using phishing simulations that mimic this style of attack.
- Enhance Incident Response – Ensure your playbooks account for archive-based malware infiltration.
Conclusion
CVE-2025-8088 is a reminder that even trusted, long-standing tools like WinRAR can become vehicles for sophisticated cyberattacks. By keeping software updated, blocking suspicious content, and empowering teams with awareness, organizations can greatly reduce their exposure to such threats.
About COE Security
COE Security partners with organizations in financial services, healthcare, retail, manufacturing, and government to secure AI-powered systems and ensure compliance. Our offerings include:
- AI-enhanced threat detection and real-time monitoring
- Data governance aligned with GDPR, HIPAA, and PCI DSS
- Secure model validation to guard against adversarial attacks
- Customized training to embed AI security best practices
- Penetration Testing (Mobile, Web, AI, Product, IoT, Network & Cloud)
- Secure Software Development Consulting (SSDLC)
- Customized CyberSecurity Services
In light of threats like CVE-2025-8088, we also deliver:
- Legacy software risk assessments
- Archive extraction monitoring and malware defense strategies
- Phishing simulation and security awareness training tailored to evolving threat tactics
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