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Healthcare and education sectors are the frequent targets of a new surge in credential harvesting activity from what’s a “highly modular” .NET-based information stealer and keylogger, charting the course for the threat actor’s continued evolution while simultaneously remaining under the radar.

Dubbed “Solarmarker,” the malware campaign is believed to be active since September 2020, with telemetry data pointing to malicious actions as early as April 2020, according to Cisco Talos. “At its core, the Solarmarker campaign appears to be conducted by a fairly sophisticated actor largely focused on credential and residual information theft,” Talos researchers Andrew Windsor and Chris Neal said in a technical write-up published last week.

Infections consist of multiple moving parts, chief among them being a .NET assembly module that serves as a system profiler and staging ground on the victim host for command-and-control (C2) communications and further malicious actions, including the deployment of information-stealing components like Jupyter and Uran (likely a reference to Uranus).

While the former boasts of capabilities to steal personal data, credentials, and form submission values from the victim’s Firefox and Google Chrome browsers, the latter — a previously unreported payload — acts as a keylogger to capture the user’s keystrokes.

images from Hacker News