Disclosure context

About Atomsilo

Atomsilo is a relatively obscure ransomware group that emerged in December 2021, operating with financial motivations and maintaining a low profile compared to major ransomware operations. The group's origin and potential affiliations remain largely undocumented by major threat intelligence sources, though their limited scope of operations suggests they function as an independent entity rather than a large-scale Ransomware-as-a-Service operation. Based on available victim data, Atomsilo appears to employ targeted attacks against specific sectors, though their exact initial access vectors and technical methodologies have not been extensively documented by major security research organizations. The group has demonstrated a preference for targeting healthcare and financial services sectors, with documented activity primarily affecting organizations in Brazil and Japan, suggesting either regional focus or specific linguistic/cultural targeting capabilities. Atomsilo remains a minor player in the ransomware landscape with only five publicly documented victims, and their current operational status is unclear due to limited public reporting and analysis from major threat intelligence sources. The group has been linked to 5 public disclosures across our corpus. First observed on a leak site on December 21, 2021; most recent post February 24, 2026. The operation is currently active.

Timeline of this disclosure

December 21, 2021Cristália - Indústria Farmacêutica listed by Atomsiloon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Healthcare sector, which has 1,779 disclosures indexed across all operators we track. Geographically, Cristália - Indústria Farmacêutica is reported in Brazil, a country with 319 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

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Cristália - Indústria Farmacêutica

Claimed by Atomsilo · listed 4 years ago

53m

Age

since listed · data leaked

Status timeline

Listed
Dec 21, 2021
Data leaked

At a glance

Group: Atomsilo
Status: Data leaked
Country: Brazil
Sector: Healthcare
Listed on leak site: Dec 21, 2021

About the victim

AI dossier — public-source company profile

Cristália - Indústria Farmacêutica is a 100% Brazilian pharmaceutical, pharmochemical, and biotechnology industrial complex founded in 1972. It produces approximately 350 medicines in over 500 pharmaceutical presentations across hospital, pharma, and ophthalmic lines, and is the largest producer of anesthetics in Latin America. The company holds 131 patents and is the only Brazilian laboratory capable of developing all stages of a new medicine's production, from molecule conception to final product.

Industry: Pharmaceutical Manufacturing & Biotechnology
Employees: 1001-5000
Founded: 1972

Attack summary

Severity: critical — Confirmed data publication by a ransomware group against a major pharmaceutical manufacturer handling sensitive R&D, proprietary drug formulations, patents, and potentially patient/clinical data at scale in a critical healthcare sector.

The Atomsilo ransomware group claims an attack on Cristália - Indústria Farmacêutica with data published, indicating confirmed exfiltration. The specific data types and volume exfiltrated have not been detailed in the leak post.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Pharmaceutical research and development data
Patent documentation
Hospital and clinical product records
Active pharmaceutical ingredient formulations
Business operational data

Original description

AI-summarised, not from the leak post

Cristália - Indústria Farmacêutica is a premier pharmaceutical company based in Brazil. Founded in 1972, it is renowned for contributing to major advancements in the medical and pharmaceutical field. The company produces medicines, hospital products, and active pharmaceutical ingredients. Cristália stands out in the industry with over 200 patents and specializes in various therapeutic classes, including psychiatry, anesthesia, and oncology.

Sources

Victim sitecristalia.com.br
Leak posthttp://npmh5ahrgakbniuntyc7io4adm6ietbdbuejrfonowqtyqn24or556qd.onion/leaks.html/post.html?id=cristalia

Source

Indexed 4 years ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.