Was Sicoob hit by ransomware?

Sicoob was listed by the 8Base ransomware operation (Brazil), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the 8Base ransomware group?

8Base is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Sicoob breach?

8Base published data attributed to Sicoob. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sicoob

Claimed by 8Base · listed 2 years ago

19m

Age

since listed · data leaked

Status timeline

ListedDec 22, 2024
Data leakeddate unknown

At a glance

Group: 8Base
Status: Data leaked
Country: Brazil
Sector: Financial
Listed on leak site: Dec 22, 2024

About the victim

AI dossier — public-source company profile

Sicoob is Brazil's largest cooperative financial system, serving over 8 million members through more than 4,600 service points nationwide. It offers comprehensive financial services including current accounts, credit, investments, cards, insurance, and payment processing solutions.

Industry: Financial Services & Banking

Attack summary

Severity: critical — Sicoob is Brazil's largest cooperative financial institution with 8+ million members. Confirmed data publication by ransomware group of a major financial services provider represents exposure of regulated financial data and PII at massive scale.

8Base claims to have compromised Sicoob's systems. The group has published data but specific details on whether exfiltration, encryption, or both occurred are not clearly stated in the available excerpt.

critical

Data the group says was taken

AI dossier — extracted from the leak post

customer accounts
member financial records
transaction data
personal identification information

What the group claims

Sicoob is a cooperative financial institution present throughout Brazil. Millions of people are already part of this movement. Sicoob is the largest cooperative financial system in the country, with more than 8 million members and more than 4.6 thousand service points distributed throughout Brazil. We are a financial cooperative that offers members Current Account Services, Credit, Investment, cards, Social Security, consortium, insurance, bank collection, acquisition of electronic means of payment, among others. In other words, we have a complete portfolio to meet our audience. We are recognized as the third best financial institution in Brazil according to the ranking "Best Banks in the world 2024", carried out by Forbes in partnership with the market research company Statista. https://www.sicoob.com.br/

Sources

Victim sitesicoob.com.br
Leak posthttp://xfycpauc22t5jsmfjcaz2oydrrrfy75zuk6chr32664bsscq4fgyaaqd.onion/company/7890492

Source

Indexed 2 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.

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Disclosure context

About 8Base

8Base is a ransomware group that emerged in May 2023, operating with primarily financial motivations and demonstrating a rapid escalation in activity with 458 documented victims across multiple sectors. The group's origin and specific affiliations remain largely undocumented by major security agencies, though their operational patterns suggest they function as an independent ransomware operation targeting predominantly Western markets. Based on publicly available victim data, 8Base appears to focus on opportunistic attacks against business services and manufacturing sectors, with the United States representing their primary target geography, followed by France, Brazil, Italy, and the United Kingdom, indicating a preference for developed economies with established digital infrastructure. The group has notably impacted healthcare and technology sectors alongside their primary business services focus, suggesting a broad targeting approach rather than sector-specific specialization. Given the group's recent emergence in 2023 and continued victim accumulation across diverse geographic and sectoral targets, 8Base appears to remain active as of current reporting periods, though detailed technical methodologies, specific attack vectors, and notable high-profile campaigns have not been extensively documented in public threat intelligence reporting from major security agencies. The group has been linked to 458 public disclosures across our corpus. First observed on a leak site on May 23, 2023; most recent post February 1, 2025. The operation is currently inactive.

Timeline of this disclosure

December 22, 2024Sicoob listed by 8Baseon the group's public leak site

Other recent disclosures by 8Base

8Base has been linked to 458 public victims on Darkfield. A sample of the most recent:

See the full 8Base dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial sector, which has 426 disclosures indexed across all operators we track. Geographically, Sicoob is reported in Brazil, a country with 404 ransomware disclosures in our corpus.

If your organisation is affected

A listing by 8Base means Sicoob appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CERT.br (Brazil), as required for your jurisdiction.
Monitor for the data appearing on 8Base's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.