Qilin and Warlock Ransomware Utilize BYOVD to Disable EDR Tools
In April 2026, cybersecurity researchers from Cisco Talos and Trend Micro identified that the Qilin and Warlock ransomware groups are employing the 'Bring Your Own Vulnerable Driver' (BYOVD) technique to disable endpoint detection and response (EDR) tools on compromised systems. This method involves deploying malicious DLLs, such as 'msimg32.dll,' to initiate multi-stage infection chains that terminate over 300 EDR drivers from various security vendors. By leveraging vulnerable drivers like 'rwdrv.sys' and 'hlpdrv.sys,' these ransomware groups effectively neutralize security defenses, facilitating the encryption of files and demanding ransoms from victims. ([thehackernews.com](https://thehackernews.com/2026/04/qilin-and-warlock-ransomware-use.html?utm_source=openai)) The adoption of BYOVD tactics by Qilin and Warlock underscores a significant evolution in ransomware strategies, highlighting the increasing sophistication of threat actors in circumventing traditional security measures. This trend necessitates enhanced vigilance and the implementation of advanced security protocols to detect and mitigate such evasive techniques.
Kill Chain
