Water Kurita
Water Kurita is a financially motivated cybercriminal entity associated with the Lumma Stealer infostealer-as-a-service operation, primarily active on underground forums and marketplaces. It focuses on credential and information theft at scale, monetizing access via subscription-based malware distribution and resale of stolen data to other actors. The group demonstrates solid operational security and marketing tactics typical of mature MaaS ecosystems, although a 2025 doxxing campaign exposing alleged core members (personal and financial data) significantly disrupted its activity and drove customers toward competing infostealers.
CVEs in recent coverage
No CVEs named alongside this actor in the last 90 days.
Recent victims
No leak-site posts on record for this group.
Recent activity
No posts or advisories have named this actor recently.
References
- https://www.trendmicro.com/en_us/research/25/c/ai-assisted-fake-github-repositories.html
- https://www.trendmicro.com/en_us/research/25/g/lumma-stealer-returns.html
- https://www.trendmicro.com/en_us/research/25/j/the-impact-of-water-kurita-lumma-stealer-doxxing.html
- https://www.trendmicro.com/en_us/research/25/k/lumma-stealer-browser-fingerprinting.html
From the MISP threat-actor galaxy, MITRE ATT&CK and RansomLook (CC BY 4.0). Activity is any post or advisory Watch Floor collected that names the actor or one of its aliases.