A hole in Microsoft Office is being exploited by bad actors, including Russian hackers targeting Ukraine's government.

The hosting provider's compromise allowed attackers to deliver malware through tainted software updates for six months.

APT28 exploited a Microsoft Office flaw to deliver MiniDoor and Covenant Grunt malware in targeted attacks across Ukraine and Eastern Europe.

APT28's attacks use specially crafted Microsoft Rich Text Format (RTF) documents to kick off a multistage infection chain to deliver malicious payloads.

Ukraine's Computer Emergency Response Team (CERT) says that Russian hackers are exploiting CVE-2026-21509, a recently patched vulnerability in multiple versions of Microsoft Office.

In an alert published on Sunday, CERT-UA says the activity is being driven by UAC-0001, better known as "APT28" or "Fancy ...

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