APT / THREAT GROUP

WellMess

aliases

Last seen:Mar 17, 2026

Intelligence Profile

WellMess is A Remote Access Trojan written in GoLang and .NET. It has hard-coded User-Agents. Attackers deploy WellMess using separate tools which also allow lateral movement, for example "gost". Command and Control traffic is handled via HTTP using the Set-Cookie field and message body.

Threat Analysis

WellMess is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

External References

→https://blog.jpcert.or.jp/2018/07/malware-wellmes-9b78.html

→https://blog.talosintelligence.com/2020/08/attribution-puzzle.html

→https://blogs.jpcert.or.jp/en/2018/07/malware-wellmes-9b78.html

→https://censys.com/advanced-persistent-infrastructure-tracking/

→https://community.riskiq.com/article/541a465f/description

Quick Facts

TypeAPT / Threat Group

Aliases2

Also Known As

WellMesswin.wellmess

External Intelligence

Malpedia: win.wellmess

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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