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Winter Vivern: APT Actor Now Targeting Officials in Europe and U.S.



Winter Vivern, an advanced persistent threat (APT) actor, is now targeting officials in Europe and the U.S. as part of an ongoing cyber espionage campaign, according to Proofpoint. Proofpoint, an enterprise security firm, is tracking the activity under its own moniker TA473 (aka UAC-0114), describing it as an adversarial crew whose operations align with that of Russian and Belarussian geopolitical objectives. What it lacks in sophistication, it makes up for in persistence. In recent months, the group has been linked to attacks targeting state authorities of Ukraine and Poland as well as government officials in India, Lithuania, Slovakia, and the Vatican. The NATO-related intrusion wave entails the exploitation of CVE-2022-27926 (CVSS score: 6.1), a now-patched medium-severity security flaw in Zimbra Collaboration that could enable unauthenticated attackers to execute arbitrary JavaScript or HTML code. This also involves employing scanning tools like Acunetix to identify unpatched webmail portals belonging to targeted organizations with the goal of sending phishing email under the guise of benign government agencies.

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