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AiLock is a ransomware-as-a-service operation first publicly identified in March 2025. The group conducts extortion through a negotiation portal and a leak site, indicating theft of victim data in addition to file encryption. Reporting in 2026 also noted that the operation resumed activity and republished information related to prior victims. Victim disclosures showed a coordinated cluster on 2026-03-03 consistent with opportunistic mass exploitation of a shared vulnerability rather than exclusively bespoke intrusions. AiLock has targeted organizations across multiple countries, including the United States, Japan, Spain, Germany, France, Italy, Mexico, Switzerland, and Chile, with observed victims spanning construction, manufacturing, healthcare, education, business services, and consumer-facing organizations. This breadth of targeting is consistent with financially motivated RaaS operations rather than a narrowly scoped espionage actor. Technical analysis of the ransomware shows a C/C++ codebase using ChaCha20 for file encryption and NTRUEncrypt to protect metadata and encryption material. The malware supports multithreaded encryption using I/O Completion Ports, separates path traversal from encryption logic, and varies behavior by file size, including full encryption of smaller files and partial encryption of larger ones. Observed functionality includes drive and network-share enumeration, service stopping, process termination, recycle-bin clearing, dynamic API resolution, XOR-based string obfuscation, wallpaper and icon changes, and self-deletion. These behaviors demonstrate mature post-compromise encryption tradecraft, defense evasion, and broad impact on victim environments. Known aliases include ailock and ailock_ransomware_group.
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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.
10 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Threat actor targeting professional services, with activity suggesting coordinated mass exploitation of a shared vulnerability and focus on confidential client data.
Threat actor targeting professional services with activity suggestive of mass exploitation via a shared vulnerability.
Conducting a ransomware attack resulting in a data breach against Yaomasa, a Japanese supermarket chain.
Conducting a ransomware attack resulting in a data breach against DAISEN in Japan.
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.