Ransomware Operators Abuse Velociraptor for Persistent Access and Deployment
Ransomware operators have begun leveraging Velociraptor, an open-source digital forensics and incident response (DFIR) tool, to facilitate and enhance their attacks on enterprise environments. Cisco Talos confirmed that Velociraptor, previously not definitively linked to ransomware campaigns, was used by threat actors believed to be associated with Storm-2603 and possibly a China-based group. These actors targeted VMware ESXi virtual machines and Windows servers, deploying multiple ransomware strains including Warlock, LockBit, and Babuk, which resulted in significant disruption to the victim's IT infrastructure. The attackers installed an outdated version of Velociraptor (0.73.4.0) that contained a privilege escalation vulnerability (CVE-2025-6264), enabling them to execute arbitrary commands and potentially take over endpoints. Velociraptor was used to maintain stealthy, persistent access, allowing the attackers to operate undetected while preparing and executing the ransomware payloads. In addition to Velociraptor, the attackers utilized the Windows msiexec utility to download and install tools from a Cloudflare Workers domain, including Visual Studio Code and the Radmin remote administration tool, further expanding their control and tunneling capabilities. Visual Studio Code was installed as a service and configured to create a tunnel to an attacker-controlled command-and-control (C2) server, with logs redirected for monitoring. The attackers also used encoded PowerShell commands to automate the download and execution of these tools. Sophos incident responders encountered the same threat actors in a separate incident, where they were able to prevent the final deployment of ransomware, but observed the same tactics, techniques, and procedures (TTPs). The use of Velociraptor in these attacks highlights a growing trend of threat actors repurposing legitimate security tools for malicious purposes, complicating detection and response efforts. The campaign demonstrates the attackers' ability to combine multiple open-source and commercial tools to achieve persistence, lateral movement, and data exfiltration. The presence of Babuk ransomware files on the victim's network marks a new development, as this strain had not previously been associated with Storm-2603. The attackers' use of multiple ransomware variants in a single campaign suggests a flexible and opportunistic approach to maximizing impact. The exploitation of a known vulnerability in Velociraptor underscores the importance of timely patching and monitoring of security tools themselves. The campaign also involved the use of Cloudflare tunneling and remote administration utilities, indicating a sophisticated approach to maintaining access and evading detection. The incident serves as a warning to organizations about the risks of outdated or misconfigured security tools being turned against them. Security teams are advised to monitor for unusual deployments of DFIR tools and to ensure all such software is kept up to date. The blending of legitimate and malicious activity in these attacks poses significant challenges for defenders, requiring enhanced vigilance and advanced detection capabilities.
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