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UTA0307 is a suspected Russia-aligned threat cluster associated with Microsoft 365-focused social engineering and OAuth abuse operations. The cluster has been discussed alongside other Russia-linked activity sets including APT29, Storm-2372, and UTA0304, particularly in campaigns abusing device code authentication and related Microsoft authorization workflows to obtain persistent access to victim accounts. Activity associated with UTA0307 centers on phishing and social engineering that leverages legitimate Microsoft identity infrastructure rather than attacker-controlled malware delivery. Reported tradecraft includes device code phishing, in which victims are lured into entering attacker-supplied codes into legitimate Microsoft authentication pages, enabling the actor to obtain access and refresh tokens for account takeover. Related Russia-linked operations tied to the same broader ecosystem have also used one-to-one impersonation, messaging-platform outreach, and abuse of OAuth authorization flows to trick targets into sharing Microsoft-generated authorization codes. These methods reduce user suspicion and complicate detection because they rely on trusted first-party services. Victimology linked to the broader campaigns in which UTA0307 has been referenced includes organizations and individuals connected to government, think tanks, higher education, transportation, human rights, and Ukraine-related affairs, as well as sectors such as energy. Additional large-scale Microsoft 365 targeting associated with the same device code phishing trend has affected organizations in financial services, healthcare, manufacturing, real estate, construction, non-profit, legal, and government sectors across North America, Europe, and Oceania. The actor’s observed and attributed objectives are consistent with espionage-oriented unauthorized access to cloud accounts and subsequent theft of sensitive organizational or personal information. High-confidence reporting ties UTA0307 to credential and token theft through phishing-based initial access and follow-on access to victim Microsoft 365 data, but publicly available information in this context does not clearly delineate UTA0307 as distinct from adjacent Russia-aligned clusters beyond its inclusion in attribution sets for these campaigns.
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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 conducting device code phishing operations targeting Microsoft 365 identities.
UTA0307 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 UTA0307 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.