UPDATE (June 9): On June 6, 2023, Mandiant merged UNC4857 into FIN11 based on targeting, infrastructure, certificate and data leak site (DLS) overlaps. This blog post has been updated to reflect the new attribution and supporting evidence.
Mandiant has observed wide exploitation of a zero-day vulnerability in the MOVEit Transfer secure managed file transfer software for subsequent data theft. This vulnerability was announced by Progress Software Corporation on May 31, 2023 and has been assigned CVE-2023-34362. Based on initial analysis from Mandiant incident response engagements, the
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