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REvil’s Grand Coup | Abusing Kaseya Managed Services Software for Massive Profits

What Happened?
On Friday, July 2nd, 2021 a well-orchestrated, mass-scale, ransomware campaign was discovered targeting customers of Kaseya’s managed services software and delivering REvil ransomware. It was initially considered a supply chain attack, a safe assumption at that scale, but with time it became apparent that the attackers were instead leveraging a zero-day exploit against internet-facing Kaseya VSA servers.

Kaseya’s initial advisory underscored the severity of the situation as the company instructed customers to shut down VSA servers until further notice. Since then, Kaseya has engaged the security community and triaged the root cause of this incident. This post seeks to unravel the infection chain, highlight relevant indicators, and clarify protections for companies.