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Mandiant has identified multiple DARKSIDE victims through our incident response engagements and from reports on the DARKSIDE blog. Reporting on DARKSIDE has been available in advance of this blog post to users of Mandiant Advantage Free, a no-cost version of our threat intelligence platform.

While the threat actors commonly relied on commercially available and legitimate tools to facilitate various stages of their operations, at least one of the threat clusters also employed a now patched zero-day vulnerability. These clusters demonstrated varying levels of technical sophistication throughout intrusions. Mandiant currently tracks multiple threat clusters that have deployed this ransomware, which is consistent with multiple affiliates using DARKSIDE. DARKSIDE ransomware operates as a ransomware-as-a-service (RaaS) wherein profit is shared between its owners and partners, or affiliates, who provide access to organizations and deploy the ransomware.

The origins of these incidents are not monolithic. Like many of their peers, these actors conduct multifaceted extortion where data is both exfiltrated and encrypted in place, allowing them to demand payment for unlocking and the non-release of stolen data to exert more pressure on victims. Since initially surfacing in August 2020, the creators of DARKSIDE ransomware and their affiliates have launched a global crime spree affecting organizations in more than 15 countries and multiple industry verticals.

We have not independently validated these claims and there is some speculation by other actors that this could be an exit scam. The post cited law enforcement pressure and pressure from the United States for this decision.

Decrypters would also be provided for companies who have not paid, possibly to their affiliates to distribute. This announcement stated that they lost access to their infrastructure, including their blog, payment, and CDN servers, and would be closing their service. Update (May 14): Mandiant has observed multiple actors cite a May 13 announcement that appeared to be shared with DARKSIDE RaaS affiliates by the operators of the service.

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