VERY IMPORTANT

A sophisticated phishing campaign targeting a Ukrainian government agency exploits a cross-site scripting vulnerability in Zimbra Collaboration Suite. The attack, attributed to a Russian APT group, uses a seemingly innocuous internship inquiry email to deliver a malicious JavaScript payload. When opened in a vulnerable Zimbra webmail session, the script silently executes, harvesting credentials, session tokens, 2FA codes, and mailbox contents. The multi-stage attack employs obfuscation techniques, SOAP API abuse, and dual-channel exfiltration via DNS and HTTPS. The campaign demonstrates the evolution of webmail-focused intrusions, relying on browser-resident stealers rather than traditional malware binaries.