Threat Actor

Winter Vivern

Also known as: Winter Vivern, 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.

27
Techniques
0
indicators on this record

Properties

Last source
MITRE ATT&CK
STIX ID
intrusion-set--75a07184-a7e5-4222-95a1-a04dbc96a29c
In Signal since
initial import (Sep 2026)
Retrieved at
2026-11-02T12:53:29+00:00
Type
intrusion-set

MITRE ATT&CK Techniques (27)

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Automated Collection (T1119)

Once established within a system or network, an adversary may use automated techniques for collecting internal data. Methods for performing this techn

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Automated Exfiltration (T1020)

Adversaries may exfiltrate data, such as sensitive documents, through the use of automated processing after being gathered during Collection.(Citation

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Command and Scripting Interpreter (T1059)

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of intera

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Deobfuscate/Decode Files or Information (T1140)

Adversaries may use Obfuscated Files or Information to hide artifacts of an intrusion from analysis. They

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Domains (T1583.001)

Adversaries may acquire domains that can be used during targeting. Domain names are the human readable names used to represent one or more IP addresse

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Drive-by Compromise (T1189)

Adversaries may gain access to a system through a user visiting a website over the normal course of browsing. Multiple ways of delivering exploit code

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Exfiltration Over C2 Channel (T1041)

Adversaries may steal data by exfiltrating it over an existing command and control channel. Stolen data is encoded into the normal communications chan

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Exploit Public-Facing Application (T1190)

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network. The weakness in the system can be a

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File and Directory Discovery (T1083)

Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file s

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Ingress Tool Transfer (T1105)

Adversaries may transfer tools or other files from an external system into a compromised environment. Tools or files may be copied from an external ad

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JavaScript (T1059.007)

Adversaries may abuse various implementations of JavaScript for execution. JavaScript (JS) is a platform-independent scripting language (compiled just

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Local Email Collection (T1114.001)

Adversaries may target user email on local systems to collect sensitive information. Files containing email data can be acquired from a user’s local s

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Malicious Link (T1204.001)

An adversary may rely upon a user clicking a malicious link in order to gain execution. Users may be subjected to social engineering to get them to cl

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Masquerade Task or Service (T1036.004)

Adversaries may attempt to manipulate the name of a task or service to make it appear legitimate or benign. Tasks/services executed by the Task Schedu

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Masquerading (T1036)

Adversaries may attempt to manipulate features of their artifacts to make them appear legitimate or benign to users and/or security tools. Masqueradin

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PowerShell (T1059.001)

Adversaries may abuse PowerShell commands and scripts for execution. PowerShell is a powerful interactive command-line interface and scripting environ

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Scheduled Task (T1053.005)

Adversaries may abuse the Windows Task Scheduler to perform task scheduling for initial or recurring execution of malicious code. There are multiple w

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Screen Capture (T1113)

Adversaries may attempt to take screen captures of the desktop to gather information over the course of an operation. Screen capturing functionality m

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Spearphishing Attachment (T1566.001)

Adversaries may send spearphishing emails with a malicious attachment in an attempt to gain access to victim systems. Spearphishing attachment is a sp

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System Information Discovery (T1082)

An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and

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System Owner/User Discovery (T1033)

Adversaries may attempt to identify the primary user, currently logged in user, set of users that commonly uses a system, or whether a user is activel

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Virtual Private Server (T1583.003)

Adversaries may rent Virtual Private Servers (VPSs) that can be used during targeting. There exist a variety of cloud service providers that will sell

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Vulnerability Scanning (T1595.002)

Adversaries may scan victims for vulnerabilities that can be used during targeting. Vulnerability scans typically check if the configuration of a targ

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Web Portal Capture (T1056.003)

Adversaries may install code on externally facing portals, such as a VPN login page, to capture and transmit credentials of users who attempt to log i

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Web Protocols (T1071.001)

Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with exi

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Web Services (T1584.006)

Adversaries may compromise access to third-party web services that can be used during targeting. A variety of popular websites exist for legitimate us

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Windows Command Shell (T1059.003)

Adversaries may abuse the Windows command shell for execution. The Windows command shell (cmd) is the prima

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