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Umbreon is an unverified dark-web access broker or buyer handle associated with soliciting exclusive initial access to large corporate networks. In July 2026, the operator advertised flat-rate purchases, using escrow, for access to organizations with annual revenue exceeding $350 million. Requested access included remote-access services, remote management platforms, enterprise directory and identity environments, and cloud identity infrastructure. The operator sought access to organizations in the United States, Canada, the United Kingdom, Switzerland, France, Australia, and Ireland, while excluding entities in the CIS region, schools, and hospitals. Healthcare-adjacent organizations, including pharmaceutical and biotechnology companies, were expressly considered acceptable targets. No intrusion or victim compromise was claimed by the operator, and Umbreon has not been reliably attributed to a known threat group or country.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
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.
3 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 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.