Threat actors
FlyingYeti
crimewareRUvia MISP
1 CVE attributed
Aliases2
Flying YetiStorm-1837
FlyingYeti is a Russia-aligned threat actor targeting Ukrainian military entities. They conduct reconnaissance activities and launch phishing campaigns using malware like COOKBOX. FlyingYeti exploits the WinRAR vulnerability CVE-2023-38831 to infect targets with malicious payloads. Cloudforce One has successfully disrupted their operations and provided recommendations for defense against their phishing campaigns.
Attributed CVEs1
| CVE | Description | Severity | EPSS | Flags | Modified |
|---|---|---|---|---|---|
| CVE-2023-38831 | RARLAB WinRAR before 6.23 allows attackers to execute arbitrary code when a user attempts to view a benign file within a ZIP archive. The issue occurs because a ZIP archive may include a benign file (such as an ordinary .JPG file) and also a folder that has the same name as the benign file, and the contents of the folder (which may include executable content) are processed during an attempt to access only the benign file. This was exploited in the wild in April through October 2023. | HIGH7.8 | 98%p100 | KEV+RWeaponized | 2025-10-31 |