The Hidden RAT: Detecting PureHVNC with Argus by Genix Cyber
PureHVNC is a stealthy hidden VNC remote access trojan abused by initial access brokers. Here's how Argus surfaces it across endpoint, network, and identity telemetry.
PureHVNC is a commercially available remote access trojan that creates a hidden virtual desktop on the victim's machine, allowing operators to interact with the system invisibly while the legitimate user continues working.
Because PureHVNC piggybacks on legitimate Windows components and avoids dropping noisy artifacts, it routinely slips past signature-based AV. Detecting it reliably requires correlating subtle behavioral indicators across multiple telemetry sources.
Inside Argus, three signals drive high-confidence detection: anomalous svchost child processes spawning hidden desktop sessions, unusual outbound TLS to short-lived infrastructure, and identity events that don't match the user's baseline activity windows.
When Argus correlates these signals, it raises a single high-fidelity case with a recommended containment playbook: isolate the host, kill the hidden session, rotate the user's credentials, and collect a memory image for forensic review.