In 2021, Kaspersky researchers began to investigate an attack on the telecom industry in South Asia. During the investigation, they discovered QSC: a multi-plugin malware framework that loads and runs plugins (modules) in memory. The framework includes a Loader, a Core module, a Network module, a Command Shell module and a File Manager module. It is dropped either as a standalone executable or as a payload file along with a loader DLL. In this post, the researchers describe each component of the framework as well as its recent activity including a deployment scenario, an additional backdoor, post-compromise activity and a link to the CloudComputating group.
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Source: Kaspersky
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