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Blue Charlie is a cyber-espionage threat actor assessed by Microsoft and the UK government to be linked to Callisto Group, COLDRIVER, and SEABORGIUM. The actor is known primarily for phishing and credential-harvesting operations and has been associated with infrastructure used to support those campaigns. Blue Charlie has been tracked as TAG-53 and is part of the cluster of activity commonly discussed under the COLDRIVER/SEABORGIUM naming conventions. High-confidence reporting ties the actor to credential-focused intrusion activity rather than ransomware or disruptive monetization. The available evidence in this record specifically supports phishing and credential-harvesting infrastructure usage, but does not directly establish additional lifecycle behaviors, victim sectors, or geographic targeting at a level suitable for inclusion here.
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.
Attributed origin per open-source reporting.
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.