Cyber Resilience

Threat actor · all actors

Winter VivernG1035 state

🇷🇺 RU

aka Winter Vivern, TA473, UAC-0114, TAG-70, TA-473

Last updated: 2026-08-20

1attributed CVEs
36ATT&CK techniques
4.3IDF score (tooling uniqueness)
1exclusive CVEs
2021years active

About this actor

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.(Citation: DomainTools WinterVivern 2021)(Citation: SentinelOne WinterVivern 2023)(Citation: CERT-UA WinterVivern 2023)(Citation: ESET WinterVivern 2023)(Citation: Proofpoint WinterVivern 2023)

Source: MITRE ATT&CK

Names & naming systems

Each vendor coins its own name for the same actor. Where a name follows a known scheme we attribute it; the rest are listed honestly as unclassified.

MITRE ATT&CKG-number catalogue id

G1035

CERT-UAUAC cluster id

UAC-0114

ProofpointTA threat-actor id

TA473

Recorded FutureTAG id

TAG-70

Unclassifiedno scheme matched

Winter VivernTA-473

How we know this

Data origin
MITRE ATT&CK Imported from the MITRE ATT&CK STIX bundle as an intrusion-set object.
Techniques
MITRE ATT&CK STIX mappings — 36 ATT&CK techniques on file.
Named victims
None on file.

See how actor data is built for the full pipeline.

Activity timeline

Profile

CVERiskCVSSEPSSPublishedProducts
CVE-2021-35207 5.16.10.03302021-07-02see CVE

Mitigating controls (NIST 800-53)

ControlTechniques coveredCoverage
SI-420 / 3656%
CM-619 / 3653%
CM-217 / 3647%
SI-315 / 3642%
CA-713 / 3636%
AC-412 / 3633%
AC-311 / 3631%
AC-611 / 3631%
CM-711 / 3631%
SC-711 / 3631%
SI-711 / 3631%
AC-210 / 3628%
CM-88 / 3622%
SI-28 / 3622%
AC-177 / 3619%

Co-occurring actors

None.

Similar actors

Similar TTPs

Active in same years

Same nation-state

Same category