Cybersecurity — 2026-04-24

ESET Discovers China-Aligned GopherWhisper APT Using Slack and Discord to Target Government Systems

ESET first identified GopherWhisper in January 2025 upon discovering LaxGopher in a Mongolian government system, with backdoor activity traced back to November 2023. The full seven-tool kit includes Go-based backdoors LaxGopher, RatGopher, and BoxOfFriends; C++ backdoor SSLORDoor; injector JabGopher; exfiltration tool CompactGopher; and loader FriendDelivery. The attackers hardcoded API credentials directly into the backdoors, an OPSEC failure that allowed ESET to access the attacker-operated Discord and Slack servers and enumerate dozens of additional victims. China attribution rests on C&C activity concentrated between 08:00–17:00 UTC+8.

Analysis
GopherWhisper's use of hardcoded API credentials in its backdoors represents an operational security failure that allowed ESET to pivot from a single Mongolian government compromise to mapping dozens of additional victims, a tactical gift that rarely occurs in state-aligned APT campaigns. The seven-tool kit's exclusive use of Go and commercial collaboration platforms (Discord, Slack, Outlook) for command-and-control parallels the compromised-device infrastructure strategy documented in the allied AA26-113A advisory released the same day, suggesting a broader shift in Chinese state-aligned operations toward blending malicious traffic with legitimate enterprise communications. China attribution rests on work-hour analysis concentrated in UTC+8 rather than technical indicators, which is circumstantial but consistent with prior ESET methodology.
4 sources
  1. ESET Research discovers new China-aligned group GopherWhisper - GlobeNewsWire
  2. China-linked hackers targeted Mongolian government using Slack, Discord for covert communications - The Record
  3. New GopherWhisper APT group abuses Outlook, Slack, Discord for comms - BleepingComputer
  4. GopherWhisper: A burrow full of malware - WeLiveSecurity (ESET Research)

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