Kaspersky researchers have discovered overlap between the GreyEnergy threat group, considered the successor to  BlackEnergy, and the Sofacy subset Zebrocy.

Researchers described GreyEnergy and BlackEnergy as an advanced threat group that possesses extensive knowledge on penetrating their victim´s networks and exploiting any available vulnerabilities. The threat actor is also known for updating its tools and infrastructure to avoid detection, tracking and attribution.

Most recently, the GreyEnergy malware was spotted attacking industrial and ICS targets, mainly in Ukraine, while Zebrocy has mainly targeted government agencies widely spread across the Middle East, Europe and Asia, according to a Jan. 24 blog post.

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