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Malware

QuietSieve

According to Microsoft, this is a heavily obfuscated .NET malware, primarily geared towards the exfiltration of data from the compromised host.

QuietSieve is a Windows malware family operated by Gamaredon Group.

Background

Microsoft characterizes this as a strongly obfuscated .NET malware whose main purpose is to steal data from an infected machine. Beyond exfiltration, it can also accept and run a remote payload supplied by the operator.

Source: Malpedia (Fraunhofer FKIE).