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Diamond Sleet is a North Korean government-linked cyber threat actor tracked by Microsoft under its "Sleet" naming convention for DPRK-associated operators. The actor has been associated with exploitation of JetBrains TeamCity vulnerability CVE-2023-42793 to obtain remote code execution, including activity aligned with software supply-chain intrusion tradecraft. Diamond Sleet has targeted organizations in Europe, with reported victim countries including the United Kingdom, Denmark, Ireland, and Germany. The available reporting directly links Diamond Sleet to vulnerability exploitation for initial access and subsequent post-compromise activity, but does not provide high-confidence detail on broader malware families, sub-groups, or additional lifecycle behaviors beyond this intrusion vector. Diamond Sleet should be understood as part of the broader ecosystem of North Korean state cyber operations that support intelligence collection and regime objectives.
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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.
Geographies tied to known operations.
Attributed origin per open-source reporting.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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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.