Trusted DesignA persistent cyberespionage campaign tracked as CL-STA-1114, overlapping with Russian threat actor activity known as Void Blizzard and LAUNDRY BEAR, has been targeting Zimbra webmail in government, defense, transportation, and financial organizations. The campaign focuses on NATO member states, Ukraine, Commonwealth of Independent States countries, and Africa. Attackers exploit CVE-2025-66376, a vulnerability in Zimbra Collaboration Suite, using zero-click phishing emails that automatically inject malicious JavaScript payloads without user interaction. The payload exfiltrates sensitive data including login credentials, email archives, CSRF tokens, 2FA scratch codes, and 90 days of email history to command and control servers. Active since 2024, the campaign targeting Zimbra servers began in July 2025, utilizing HTML attachments with obfuscated Base64-encoded scripts that deploy SVG elements to inject the JavaScript into victims' browsers.
Created: 2026-08-22
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