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Attackers Employ Sneaky New Method to Control Trojans

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Attackers Employ Sneaky New Method to Control TrojansA new malware sample shows threat actors have begun using DNS TXT record and queries for C2 communications, Cisco Talos says,

Security researchers at Cisco’s Talos intelligence and research group have discovered what they describe as an extremely evasive and uncommon way for threat actors to command and to communicate with a Remote Access Trojan (RAT) on an infected system.

The multi-stage method involves the use of the Domain Name System (DNS) in a manner that makes bidirectional C2 communication between an infected host and a malicious server almost invisible - even to organizations that have implemented controls for restricting outbound DNS.

Talos security researchers discovered the new threat while studying a malware sample that had been uploaded to a public sandbox designed for malware analysis. Their analysis revealed the malware was designed to infect targeted systems via the use of phishing emails containing a...(continued)

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