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Ransomware is targeting vulnerable Microsoft Exchange servers

March 12, 2021

The Microsoft Exchange attacks using the ProxyLogon vulnerability, and previously associated with the dropping of malicious web shells, are taking on a ransomware twist. Until now, the name of the game has been compromise and data exfiltration, with a bit of cryptomining on the side.

To summarise: In ten days we’ve gone from “limited and targeted attacks” by a nation-state actor, to countless attacks by a number of groups against anyone with a vulnerable server. And in the space of a week the severity has escalated from unused web shells to ransomware. Depending on how the uptake in patching goes, this could well evolve again.

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