atomsilo
Activity analysis
HackerFeeds has tracked 5 victims claimed by atomsilo since December 2021, most recently in February 2026 — ranking #259 of 332 groups (0% of all tracked ransomware victims). No new victims have been posted in the last 180 days; the most recent claim was in February 2026. Its most-targeted sector is Healthcare (2 victims), followed by Manufacturing (1). Brazil accounts for 2 victims (67% of those with a known location); 2 victims did not disclose a location.
Victims per year
- 20214
- 20261
Top sectors
- Healthcare2
- Manufacturing1
- Financial Services1
Computed from victims claimed on the group's leak site as collected by HackerFeeds; claims are not independently verified. Monthly reports · Methodology
Group profile
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.
Recent victims
| Date | Website / victim | Sector | Country |
|---|---|---|---|
| 2026-02-24 |  A large bank in Asiabank.com | Financial Services | |
| 2021-12-21 |  Tegra Vendastegraincorporadora.com.br | Not Found | BR |
| 2021-12-21 |  Eisai Co., Ltdeisai.com | Healthcare | JP |
| 2021-12-21 | L LIGHT CONVERSION | Manufacturing | |
| 2021-12-21 |  Cristália - Indústria Farmacêuticacristalia.com.br | Healthcare | BR |