MS13089 is a newly emerged ransomware group (first observed December 2025) that named itself after a 2013 Microsoft Security Bulletin, claiming a handful of victims including a law firm, operating primarily as a double-extortion actor.
A dated ledger of actor-claimed victims, campaigns, indicators, identity mappings, relationships, and CVE links. Each date states what it measures. For extensive leak-site histories, victim entries are limited to the 100 most recent distinct listings.
Actor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedTypes: onion.
The cited upstream records use spacing or punctuation variants of the same actor name. Source records remain separate for provenance, while exact-name resolution prefers the reviewed canonical profile.
HighActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedActor-claimed victim evidence. This listing is not independent confirmation of compromise.
Actor ClaimedExact names and tracking identifiers resolve to this canonical profile. Rebrands, affiliations, and overlapping clusters remain separate confidence-rated relationships.
Every exact-name collision is reviewed. Same-actor decisions select a preferred profile while distinct and unresolved clusters remain separate.
The cited upstream records use spacing or punctuation variants of the same actor name. Source records remain separate for provenance, while exact-name resolution prefers the reviewed canonical profile.
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