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Seeking Counsel: Ongoing Targeted Campaign Against US Law Firms

Source: cloudblog.withgoogle.com 1 min read

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Seeking Counsel: Ongoing Targeted Campaign Against US Law Firms

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Mandiant reports UNC3753 ran a fast data theft extortion campaign against U.S. legal, professional, and financial services from Jan–May 2026. The group uses vishing and IT helpdesk impersonation to get screen-sharing and RMM access, steal sensitive files, and issue rapid extortion demands, with suspected cases of in-person USB data theft.

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