diff --git a/clusters/threat-actor.json b/clusters/threat-actor.json
index 5136bf1..1b0f32e 100644
--- a/clusters/threat-actor.json
+++ b/clusters/threat-actor.json
@@ -12135,6 +12135,24 @@
       },
       "uuid": "0ee7be4f-389f-4083-a1e4-4c39dc1ae105",
       "value": "Xiaoqiying"
+    },
+    {
+      "description": "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.",
+      "meta": {
+        "aliases": [
+          "UAC-0114",
+          "TA473"
+        ],
+        "refs": [
+          "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/"
+        ]
+      },
+      "uuid": "b7497d28-02de-4722-8b97-1fc53e1d1b68",
+      "value": "Winter Vivern"
     }
   ],
   "version": 288