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Nokoyawa is a Windows ransomware operation and malware family first identified in early 2022. It conducts double-extortion attacks, exfiltrating sensitive data before encrypting victim files and threatening public disclosure unless a ransom is paid. The malware targets 64-bit Windows systems and has code and lineage connections to Karma and the Nemty ransomware lineage. A later Rust-based Nokoyawa 2.0 implementation uses Curve25519 and Salsa20, supports configurable encryption behavior and skip lists, and employs partial encryption of larger files to increase execution speed. Nokoyawa activity has been linked to exploitation of the Windows Common Log File System elevation-of-privilege vulnerability CVE-2023-28252, enabling attackers to obtain SYSTEM-level privileges before ransomware deployment. Researchers have also reported operational overlap or possible cooperation involving Nokoyawa and other ransomware actors, including Play and Snatch, but these relationships are not definitively established.
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13 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 CVE this actor has used in observed campaigns. 1 of them exploited in the wild.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Ransomware operation with documented TTP overlap and suspected personnel overlap with Play.
Named as one of the groups that absorbed affiliates after the Black Basta collapse.
Conducting double extortion ransomware attacks against organizations, including data exfiltration followed by file encryption and ransom demands, while updating the ransomware to a Rust-based 64-bit Windows variant.
Mentioned as having eight overlapping victim names with Snatch in 2023, suggesting possible cooperation.
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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.