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Insomnia is a cybercriminal data-theft extortion operation active since at least October 2025. It is primarily associated with the theft and public exposure of sensitive data rather than conventional ransomware deployment: no encryptor, negotiation portal, or affiliate program has been identified. The group maintains a leak site and has published alleged victim data, including patient and personal information, to pressure or monetize victims. Insomnia has disproportionately targeted U.S. healthcare providers and healthcare-adjacent organizations, including clinical laboratories, medical practices, and law firms handling medical-malpractice matters. Its reported victims also include organizations in Brazil and Singapore. Researchers assess that Insomnia emphasizes stealth, speed, and low-visibility intrusions, using credential-based access—including credentials obtained by infostealers—authentication-bypass vulnerabilities, and legitimate infrastructure for lateral movement. The operation has claimed compromises involving protected health information and other sensitive records. Insomnia appears to avoid targeting many former Soviet Union countries, but this pattern alone does not establish its geographic origin or sponsorship.
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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.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
7 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Data-theft-only extortion operation that forgoes file encryption and relies on stolen-data exposure as its sole extortion lever.
Conducted a ransomware attack against Wiggins, Childs, Pantazis, Fisher, & Goldfarb LLC, a U.S. professional-services law firm.
Conducted a ransomware attack against Massey, Stotser & Nichols, a U.S. law firm.
Claimed responsibility for the cyber attack on Anatomic and Clinical Laboratory Associates and listed the organization on its leak site; also announced the hacking of 17 healthcare organizations, 16 of them in the United States.
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.