Winter Vivern G1035
Also known as TA473, UAC-0114.
Winter Vivern is a group linked to Russian and Belorussian interests active since at least 2020 targeting various European government and NGO entities, along with sporadic targeting of Indian and US victims. The group leverages a combination of document-based phishing activity and server-side exploitation for initial access, leveraging adversary-controlled and -created infrastructure for follow-on command and control.
Documented targeting: Government, NGO & Political
Methodology
Relevance is a match on your industry sector and technology stack against the MITRE ATT&CK v19.1 group graph (174 groups, 821 software families, 56 campaigns). It is computed deterministically from that data, with no language model in the request path. It is a relevance match, not threat-intelligence probability data: it tells you which documented actors and techniques are worth emulating for an org like yours, not a forecast that any specific group will act.
TurboPentest can autonomously exercise 2 of 27 of this actor's documented techniques today (7%). 10 are out of scope for automated testing (social engineering, denial of service, physical).
+11 coming soonmore unlock with our internal pentesting agent, currently in private beta.
These counts are computed from the vendored MITRE ATT&CK graph and the published coverage map, and are reproducible from source.
Emulate Winter Vivern. Audit-Ready pentest, $99.
Finds nothing? Your next pentest is free. If a pentest surfaces zero actionable findings, we credit you a free re-pentest. Once per target; does not apply to retests or Recon. You always walk away with real findings or a free redo.
Launch this pentestFrequently asked questions
Who is Winter Vivern (G1035)?
Winter Vivern is a group linked to Russian and Belorussian interests active since at least 2020 targeting various European government and NGO entities, along with sporadic targeting of Indian and US victims. The group leverages a combination of document-based phishing activity and server-side exploitation for initial access, leveraging adversary-controlled and -created infrastructure for follow-on command and control.
What sectors does Winter Vivern target?
Based on MITRE ATT&CK, Winter Vivern has been observed targeting Government, NGO & Political.
Can TurboPentest test for Winter Vivern?
TurboPentest can autonomously exercise 2 of 27 of this actor's documented techniques today. 11 more need internal or assumed-breach access (the Adversarial-Depth tier), and the rest are out of scope for automated testing.
What does it cost to emulate Winter Vivern?
An Audit-Ready pentest starts at $99 per target. If it surfaces zero actionable findings, your next pentest is free.
Reviewed by
Michel Chamberland, Founder & CEO of IntegSec. CISSP, OSCP, OSCE, with 20+ years in offensive security, alumni of IBM X-Force Red and Trustwave SpiderLabs.
Last reviewed July 30, 2026.