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Inactive · #282 by victimsRansomware group

Atomsilo

As of Oct 19, 2026, Atomsilo has listed 4 confirmed victims on its leak site since Jul 11, 2025, 0.0% of all victims tracked by Brandefense. Its most targeted country is United States (25.0% of its victims) and its most targeted sector is Healthcare.

AtomSilo is a double-extortion ransomware group that emerged in September 2021, exploiting the Atlassian Confluence vulnerability (CVE-[removed]) for initial access and demanding ransoms up to $1 million, attributed to the Chinese state-linked threat actor BRONZE STARLIGHT.

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Confirmed Victims
4
Rank By Victims
#282
Last Leak-Site Post
Jul 12, 2025
Top Country
United States
Top Sector
Healthcare

Victims Posted Per Month.

Atomsilo confirmed victims per month
MonthConfirmed victims
July 20254
August 20250
September 20250
October 20250
November 20250
December 20250
January 20260
February 20260
March 20260
April 20260
May 20260
June 20260
July 20260
August 20260
September 20260
October 2026 (month in progress)0
Updated continuously · figures as of Oct 19, 2026

Latest Atomsilo Victims.

Search all 4 →
Latest confirmed leak-site victims claimed by Atomsilo
VictimCountryIndustryData claimedPosted
Eisai Co., Ltd.
eisai.com
USUnited StatesHealthcareNot stated
TegravendasUnknownUnknownNot stated
LIGHT CONVERSIONUnknownUnknownNot stated
Cristália - IndÃostria FarmacÃauticaUnknownUnknownNot stated

How They Operate.

Atomsilo's threat actor profile lists 1 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

Who Atomsilo Targets.

Sectors

  1. Healthcare125.0%

Countries

  1. USUnited States125.0%
Shares are of this group's confirmed victims.

History.


  1. First seen in Brandefense data

  2. Busiest month on record: 4 confirmed victims

  3. First confirmed victim listed on its leak site

  4. Most recent leak-site post

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.