Winter Vivern

No sourced public emblem in this profile.

reference profile · reported nexus: RU (not nationality)

Winter Vivern is a cyberespionage group first revealed by DomainTools in 2021. It is thought to have been active since at least 2020 and it targets governments in Europe and Central Asia. To compromise its targets, the group uses malicious documents, phishing websites, and a custom PowerShell backdoor.

Source-reported aliases: UAC-0114, TA473, TAG-70, TA-473. Associations do not prove equivalence.

Target geography

Catalog-listed countries (associations, not attack counts): Germany

No bound claim-post feed for this label.

Historical casebook

No dated record curated yet; absence does not establish inactivity.

Planned Kinwilder coverage

Tentative editorial review windows, contingent on evidence and review; not promised publication dates or predictions of attacks.

No assigned review window.

References

Pinned source catalog

https://www.sentinelone.com/labs/winter-vivern-uncovering-a-wave-of-global-espionage/

https://www.domaintools.com/resources/blog/winter-vivern-a-look-at-re-crafted-government-maldocs

https://www.welivesecurity.com/en/eset-research/winter-vivern-exploits-zero-day-vulnerability-roundcube-webmail-servers/

https://www.proofpoint.com/us/blog/threat-insight/exploitation-dish-best-served-cold-winter-vivern-uses-known-zimbra-vulnerability

https://socprime.com/blog/uac-0114-group-aka-winter-vivern-attack-detection-hackers-launch-malicious-phishing-campaigns-targeting-government-entities-of-ukraine-and-poland/

https://cybersecuritynews.com/russian-hackers-xss-flaw/

https://www.recordedfuture.com/russia-aligned-tag-70-targets-european-government-and-military-mail

https://www.bsi.bund.de/DE/Themen/Unternehmen-und-Organisationen/Cyber-Sicherheitslage/Analysen-und-Prognosen/Threat-Intelligence/Aktive_APT-Gruppen/aktive-apt-gruppen_node.html

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