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Diagram shows how ransomware operators incorporate the SystemBC malware into an attack. (Source: Sophos) Several recent ransomware attacks, including those involving Ryuk and Egregor, have used a commodity malware variant called SystemBC as a backdoor, security firm Sophos reports. First uncovered by security firm Proofpoint in August 2019, SystemBC works as a network proxy for concealed communications and as a remote access Trojan, or RAT, that allows threat actors to deploy additional commands and scripts to infected Windows devices and to gather data. While researchers have tracked SystemBC over the years, the Sophos report finds that its creators have added new features, which ransomware operators and their affiliates are taking advantage of to deploy their crypto-locking malware.

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