Chinese APT GopherWhisper Exploits Cloud Services in Mongolian Cyber Espionage
In April 2026, ESET researchers uncovered a Chinese advanced persistent threat (APT) group named GopherWhisper targeting Mongolian government institutions. Active since at least November 2023, GopherWhisper deployed multiple custom backdoors—LaxGopher, CompactGopher, RatGopher, BoxOfFriends, and SSLORDoor—each utilizing different cloud services like Slack, Discord, Microsoft Outlook, and file.io for command-and-control communications and data exfiltration. This campaign compromised at least 12 systems within a Mongolian governmental institution, with indications of broader impact across the region. This incident underscores a growing trend of APT groups leveraging legitimate cloud services to evade detection and maintain persistent access. Organizations must enhance their monitoring of cloud-based communications and implement robust security measures to detect and mitigate such sophisticated threats.
Kill Chain