Researchers have uncovered a version of the ComRat backdoor, one of the Turla Group’s oldest malware families, that distinguishes itself by using Gmail’s web UI to receive commands and nick data.

The new version of ComRAT, known for stealing sensitive documents and targeting various government entities and military organizations, was in use as late as early 2020.

“Thanks to its use of the Gmail web interface, [ComRAT v4] is able to bypass some security controls because it doesn’t rely on any malicious domain,” said ESET researcher Matthieu Faou, who detailed his findings in a white paper. “This shows the level of sophistication of this group and its intention to stay on the same machines for a long time.”

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