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, 2021Tegra Vendas listed by Atomsiloon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, Tegra Vendas 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

← All victims

Tegra Incorporadora

listed as Tegra Vendas · 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: Not Found
Listed on leak site: Dec 21, 2021

About the victim

AI dossier — public-source company profile

Tegra Incorporadora is a Brazilian real estate development company operating under the domain tegraincorporadora.com.br. The company is involved in residential and/or commercial property development in Brazil. The victim name 'Tegra Vendas' likely refers to its sales division or brand.

Industry: Real Estate Development

Attack summary

Severity: high — Data has been published (disclosed status: data_published), indicating confirmed exfiltration of business data from a real estate company, which likely includes client PII and financial records, elevating this beyond medium severity.

The Atomsilo ransomware group claims to have attacked Tegra Incorporadora (Tegra Vendas) and has published data, indicating exfiltration occurred. No specific ransom amount or data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Potentially internal business documents
Customer/client records
Sales and financial data

Original description

AI-summarised, not from the leak post

N/A

Sources

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.