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Yurei is a ransomware group first observed in 2025 and tracked as one of several newly emerged ransomware brands. Public reporting places it among a wave of new extortion actors using Japanese-themed naming conventions. High-confidence information about Yurei remains limited: it has been identified as a ransomware operation and has appeared in victim-claim tracking and ransomware emergence reporting, but detailed technical tradecraft, malware characteristics, infrastructure, victimology, and organizational structure have not been corroborated in the available facts. No confirmed aliases, sub-groups, or state affiliation are established from the available information. Based on the available evidence, Yurei should currently be treated as a minimally profiled ransomware actor with insufficient public detail to attribute broader capabilities or targeting patterns beyond participation in ransomware activity.
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.
9 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.
Referenced as another Japanese-themed ransomware group for comparison/background.
Yurei is a newly emerged ransomware group active as of September 2025.
Named as a new ransomware variant/gang emerging in 2024 and associated with victim claims posted in September 2024.
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.