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UNC4221 is a Russia-linked cyber threat cluster also tracked as UAC-0185. U.S. authorities describe it as operating on behalf of Russian military services, and some reporting characterizes it as associated with Russian military intelligence. The activity is publicly tracked alongside UNC5792 in FBI/CISA and U.S. State Department reporting. UNC4221 has targeted Signal and WhatsApp accounts through phishing and social engineering rather than by compromising the applications’ encryption. Reported targets include current and former U.S. government officials, military personnel and leaders, allied personnel, journalists, political figures, key officials in Ukraine, diplomats, policy analysts, NGOs supporting Ukraine, and researchers focused on security and Russian affairs. Reporting also states that UNC4221 has singled out Signal accounts used by Ukrainian military personnel. Observed tradecraft includes impersonating messaging-platform support accounts, sending fake support or security messages, soliciting verification codes, account PINs, and Signal Backup Recovery Keys, and abusing legitimate device-linking features to connect attacker-controlled devices to victim accounts. Related reporting also describes the use of fake or modified Signal group invite pages and malicious QR-code/device-linking lures to hijack accounts. Once access is obtained, the actors can read private and group conversations, access contact lists and group chats, and use compromised accounts for follow-on phishing. Google Threat Intelligence Group reporting cited in the content links UNC4221/UAC-0185 to phishing infrastructure mimicking the Kropyva application used by the Armed Forces of Ukraine. The content also states that UNC4221 used Android malware STALECOOKIE, which mimics Ukraine’s DELTA battlefield management platform to steal browser cookies, and used ClickFix to deliver the TINYWHALE downloader, which then dropped MeshAgent remote management software. Additional reporting in the content places UNC4221 among Russian clusters focused on battlefield technology, secure communications, and attacks on Ukrainian and allied defense assets.
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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.
15 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
5 malware families attributed to this actor across reporting.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Russia-linked hacking group identified as working on behalf of Russian military services; cited as one of the two groups involved in the ongoing activity described in the advisory.
Russian state-linked threat group operating on behalf of Russian military services and involved in phishing and social engineering campaigns against Signal and WhatsApp users tied to U.S. and allied interests.
Russian-linked phishing activity targeting messaging accounts of government, defense, diplomatic, journalist, NGO, and academic targets, with a shift from stealing verification codes to stealing Signal Backup Recovery Keys.
Conducting phishing and social engineering campaigns against commercial messaging applications to hijack accounts, access sensitive communications, and obtain historical conversations via Backup Recovery Keys.
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.