Microsoft-signed driver weaponized in ransomware attacks
A Microsoft-signed kernel driver has been weaponized by ransomware gangs to disable security software before encrypting corporate systems, according to a new report. The tactic, known as Bring Your Own Vulnerable Driver (BYOVD), exploits Microsoft’s digital signature to bypass defenses and escalate privileges on targeted networks.
How the attack unfolds
Security researchers observed the “GodDamn” ransomware family leveraging a legitimate but vulnerable driver that Microsoft had previously signed. The driver, repurposed as a malicious component, is used to terminate endpoint protection processes and uninstall security agents across Windows environments. Once defenses are disabled, the ransomware proceeds with file encryption and data exfiltration, intensifying the impact of each breach.
The abuse hinges on Microsoft’s own validation process: drivers signed by the company are trusted by default in Windows, making them ideal for attackers seeking to evade detection. Although Microsoft revoked the driver’s signature after being notified, the incident highlights the persistent risk posed by signed but vulnerable components in the software supply chain.
Broader implications for enterprise defense
This development underscores the growing sophistication of ransomware operations and their reliance on signed components to undermine security controls. Organizations already struggling with BYOVD threats now face an added layer of complexity, as attackers exploit trusted identities to move laterally within networks. The reliance on driver signatures for system integrity is being tested, prompting calls for stricter validation and monitoring of signed code.
Why it matters
The weaponization of a Microsoft-signed driver demonstrates how trust mechanisms in operating systems can be inverted by attackers. For defenders, this means traditional endpoint security may not be sufficient; continuous monitoring of driver behavior and rapid response to signed-component abuse are becoming essential. The episode also serves as a reminder that supply chain integrity—even for signed software—requires constant vigilance to prevent exploitation at scale.
Source: Dark Reading. AI-assisted editorial synthesis — TechnoExpress.