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FBI silently removed web shells planted on Microsoft Exchange servers in the US

April 14, 2021

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A US judge granted the FBI the power to log into web shells that were injected by nation-state hackers on Microsoft Exchange servers across the US and remove the malware, announced the US Department of Justice.

“Authorities have executed a court-authorized operation to copy and remove malicious web shells from hundreds of vulnerable computers in the United States. They were running on-premises versions of Microsoft Exchange Server software used to provide enterprise-level email service.” reads the press release published by DoJ. “The FBI conducted the removal by issuing a command through the web shell to the server, which was designed to cause the server to delete only the web shell (identified by its unique file path).”

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