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UAC-0233 is a threat activity cluster tracked by CERT-UA in relation to exploitation of CVE-2025-48700, a zero-click cross-site scripting vulnerability affecting Synacor Zimbra Collaboration Suite. The observed activity has been linked to exploitation beginning in late September 2025. Successful exploitation enabled access to victim mailbox contents, archived correspondence, MFA backup codes, application passwords, and global address book data, indicating a focus on account compromise and information collection from email environments. Based on the confirmed post-exploitation outcomes, the cluster demonstrates capabilities consistent with initial access, credential theft, session or account abuse, and data exfiltration against messaging infrastructure. Available information directly ties the activity to targeting in Ukraine, but does not support a high-confidence attribution to a specific country of origin or broader alias set.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Geographies tied to known operations.
3 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.