TA866 returns with a large Email campaign

Proofpoint researchers identified the return of TA866 to email threat campaign data, after a nine-month absence.

On January 11, 2024, Proofpoint blocked a large volume campaign consisting of several thousand emails targeting North America. Invoice-themed emails had attached PDFs with names such as “Document_[10 digits].pdf” and various subjects such as “Project achievements”. The PDFs contained OneDrive URLs that, if clicked, initiated a multi-step infection chain eventually leading to the malware payload, a variant of the WasabiSeed and Screenshotter custom toolset.

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Source: Proofpoint