A novel remote access trojan (RAT) being distributed via a Russian-language spear-phishing campaign is using unique manipulation of Windows Registry to evade most security detections, demonstrating a significant evolution in fileless malware techniques. Dubbed DarkWatchman, the RAT – discovered by researchers at Prevailion’s Adversarial Counterintelligence Team (PACT) – uses the registry on Windows systems for nearly all temporary storage on a machine and thus never writes anything to disk.

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