FBULoader

Mimbrob Malware Uses Fake Dronner App to Target Russian Military and Industrial Firms

Researchers at F6 have identified a new malware campaign dubbed Mimbrob that leverages a fake drone-tracking application called Dronner. The lure promises data on heavy Baba Yaga drones and remote mining locations but instead deploys malicious payloads aimed primarily at Russian military personnel near the front line. The malware checks system language, keyboard layouts, and interface preferences, remaining dormant or terminating if Russian or certain CIS and Romanian languages are absent. Since April 2026 the same operators have conducted phishing campaigns against Russian industrial and IT companies using FBULoader disguised as a Yandex Browser update and the RAT-Go remote access trojan. The attackers register lookalike domains of legitimate Russian enterprises to deliver fake metrology notices and court documents. While espionage appears the most probable objective, researchers have not yet obtained the final payload and therefore refrain from definitive attribution.