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UTA0304 is a Russia-aligned threat cluster associated with phishing operations that abuse legitimate Microsoft authentication workflows, particularly OAuth device authorization and related token-based sign-in mechanisms, to obtain unauthorized access to Microsoft 365 accounts. The cluster has been discussed alongside other Russia-linked groups including APT29, Storm-2372, and UTA0307, and possible relationships among these clusters have been noted, although direct equivalence is not established. UTA0304 has been linked to device code phishing activity in which victims are socially engineered into entering attacker-supplied device codes at legitimate Microsoft sign-in pages. This technique allows the actor to obtain access and refresh tokens tied to the victim account, enabling persistent account access that may survive password resets until tokens are revoked or expire. The tradecraft relies on trusted Microsoft infrastructure, reducing user suspicion and complicating detection. Observed targeting associated with this broader activity includes organizations and individuals in the United States, Canada, Australia, New Zealand, Germany, and parts of Europe, as well as entities connected to Ukraine. Reported victim sectors include government, think tanks, higher education, transportation, construction, non-profit, real estate, manufacturing, financial services, healthcare, legal, and energy. Ukraine-focused specialists, human rights-related targets, and Ukrainian government and energy organizations have also been singled out in related Russia-linked campaigns using similar Microsoft-authentication abuse. The actor’s operational methods center on social engineering, phishing lures, and abuse of legitimate cloud identity workflows rather than malware-heavy intrusion chains. Reported lures in related campaigns include meeting invitations, interviews, conference participation, document-sharing themes, and impersonation of trusted institutions or officials. The objective is account takeover and subsequent access to sensitive organizational or personal data. High-confidence reporting supports espionage-oriented collection and post-compromise access rather than ransomware or disruptive operations.
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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.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
3 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Attributed as a Russia-aligned activity cluster involved in device code phishing campaigns against Microsoft 365 users.
UTA0304 is a Russia-aligned threat actor cluster using device code phishing to compromise Microsoft 365 accounts.
Referenced only as a potentially related threat cluster; no distinct TTPs or operations are attributed to UTA0304 in the provided content.
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.