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Even as the TrickBot infrastructure closed shop, the operators of the malware are continuing to refine and retool their arsenal to carry out attacks that culminated in the deployment of Conti ransomware.
IBM Security X-Force, which discovered the revamped version of the criminal gang’s AnchorDNS backdoor, dubbed the new, upgraded variant AnchorMail.
AnchorMail “uses an email-based [command-and-control] server which it communicates with using SMTP and IMAP protocols over TLS,” IBM’s malware reverse engineer, Charlotte Hammond, said. “With the exception of the overhauled C2 communication mechanism, AnchorMail’s behavior aligns very closely to that of its AnchorDNS predecessor.”
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