Microsoft Exchange servers hacked to deploy LockBit ransomware

Microsoft is investigating reports of a new zero-day bug abused to hack Exchange servers which were later used to launch Lockbit ransomware attacks. In at least one such incident from July 2022, the attackers used a previously deployed web shell on a compromised Exchange server to escalate privileges to Active Directory admin, steal roughly 1.3 TB of data, and encrypt network systems.

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