A threat actor named Sweed who has been active for more than two years using spearphishing emails with malicious attachments to spread Formbook, Lokibot and Agent Tesla has been given a detailed examination by Cisco Talos.

Cisco Talos researcher Edmund Brumaghin said for the most part Agent Tesla is the group’s favorite flavor of malware, but noted Sweed has used a variety of delivery methods since 2017.

The first that was used in 2017 had Sweed place a dropper inside a .zip archive containing Agent Tesla and then attached the file to an email claiming to contain a purchase order. The packer used .NET and leveraged steganography to hide and decode a second .NET executable, which uses the same technique to retrieve the final Agent Tesla payload, Brumaghin wrote.

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