Ransomware group profile · #267 by claimed victims
Atomsilo ransomware
AtomSilo is a double-extortion ransomware group that emerged in September 2021, exploiting the Atlassian Confluence vulnerability (CVE-2021-26084) for initial access and demanding ransoms up to $1 million, attributed to the Chinese state-linked threat actor BRONZE STARLIGHT.
Victimology
Who Atomsilo claims to have breached, from 5 leak-site posts recorded by VULONE.
Claims per month last 12 months
Top sectors
Top countries
Latest claimed victims 5 most recent
| Victim | Sector | Country | Claimed |
|---|---|---|---|
| A large bank in Asia bank.com | Financial Services | - | 24 Feb 2026 |
| Tegra Vendas tegraincorporadora.com.br | Not Found | BR | 21 Dec 2021 |
| Eisai Co., Ltd eisai.com | Healthcare | JP | 21 Dec 2021 |
| LIGHT CONVERSION | Manufacturing | - | 21 Dec 2021 |
| Cristália - Indústria Farmacêutica cristalia.com.br | Healthcare | BR | 21 Dec 2021 |
All 5 Atomsilo victims, searchable
Full victim list with claim posts, domains, timing and exports, plus the negotiation chats and leak-site screenshots VULONE archives for this crew.
Tactics, techniques and procedures
ATT&CK technique mapping for Atomsilo is in progress. Victimology, infrastructure status and leak-site tracking are live above.
Indicators, detections and the full playbook
Hashes, C2 addresses, onion services, Sigma and YARA detections per technique, and the negotiation transcripts are available to signed-in analysts.
Frequently asked
Is Atomsilo ransomware still active?
How many victims has Atomsilo claimed?
Which industries does Atomsilo target?
Which countries are most affected by Atomsilo?
Where does VULONE get Atomsilo victim data?
Other ransomware groups
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Lockbit3
Akira
ClopVictim claims are collected from leak sites and enrichment partners (ransomware.live, RansomLook) and represent the group's own assertions, not confirmed breaches. Profile last updated 31 October 2026. Questions or corrections: research@vulone.com.
