Windows RPC Privilege Escalation PhantomRPC Technique | MSSP Advisory

Kaspersky researchers discovered PhantomRPC, a Windows RPC architecture vulnerability that allows attackers to create fake RPC servers and escalate privileges on compromised systems. The technique exploits Windows Remote Procedure Call mechanisms to gain higher-level access once an initial foothold is established. This affects all Windows environments where RPC services operate, which includes virtually every Windows deployment.

Your RMM agents and remote access tools run with elevated privileges on client Windows systems, making them prime targets for this escalation technique if an attacker gains initial access. Every Windows client you manage becomes a potential privilege escalation target, and if attackers use this technique to move laterally through client networks, you need documented evidence that you warned about this specific risk.

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