HOMETHREATSUnidentified JS 006 (Winter Wyvern)
APT / THREAT GROUP

Unidentified JS 006 (Winter Wyvern)

2
aliases
Last seen:Mar 17, 2026

Intelligence Profile

A script able to list folders and emails in the current Roundcube account, and to exfiltrate email messages to the C&C server by making HTTP requests.

Threat Analysis

Unidentified JS 006 (Winter Wyvern) 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://go.recordedfuture.com/hubfs/reports/cta-2024-0217.pdf
→https://www.welivesecurity.com/en/eset-research/winter-vivern-exploits-zero-day-vulnerability-roundcube-webmail-servers/

Quick Facts

TypeAPT / Threat Group
Aliases2

Also Known As

js.unidentified_006Unidentified JS 006 (Winter Wyvern)

External Intelligence

Malpedia: js.unidentified_006

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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