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UNK_CustomCloak is a tracked threat cluster associated with password-spraying and brute-force activity against Microsoft Entra ID environments. The cluster has been observed spoofing User-Agent strings and abusing a legacy discontinued first-party application, Windows Live Custom Domains, to bypass standard sign-in restrictions during credential attacks. This activity is consistent with cloud-focused identity attacks designed to probe user passwords across large numbers of tenants while reducing the effectiveness of conventional detections. Reported operations targeted more than 4,000 Entra ID tenants. High-confidence reporting supports credential attack behavior and spoofing-based evasion against cloud identity infrastructure, but broader attribution, geographic origin, and additional victimology remain currently unavailable.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
4 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 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.