Arcus Media Ransomware Attack on Braz Assessoria Contábil

Incident Date:

May 24, 2024

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Arcus Media Ransomware Attack on Braz Assessoria Contábil


Braz Assessoria Contábil


Arcus Media


São Paulo, Brazil

, Brazil

First Reported

May 24, 2024

Arcus Media Ransomware Attack on Braz Assessoria Contábil

Company Profile and Industry Standout

Braz Assessoria Contábil Ltda is a Brazilian professional services firm specializing in accounting, tax consulting, and financial advisory services. The company offers comprehensive financial solutions tailored to the Brazilian market, aiding businesses in maintaining compliance and optimizing their financial operations. Despite not publicly disclosing its revenue, Braz Assessoria Contábil is recognized for its extensive expertise and customized service offerings in the business services sector.

Vulnerabilities and Targeted Attack

Firms like Braz Assessoria Contábil, which handle sensitive financial and personal data, are attractive targets for ransomware groups. The reliance on digital platforms for managing extensive client information and financial data makes such firms vulnerable to cyberattacks. These vulnerabilities are often exploited by threat actors to gain unauthorized access and exfiltrate critical information, which can be used for extortion.

Attack Overview

In a recent cyberattack, Braz Assessoria Contábil fell victim to the Arcus Media ransomware group. The attackers utilized sophisticated techniques to infiltrate the firm's systems, resulting in the exfiltration of sensitive data. Although specific details about the exfiltrated data and ransom demands have not been disclosed, the attack poses significant risks to the firm's operational integrity and reputation.

Details of the Ransomware Group

Arcus Media is a new ransomware group that emerged in May 2024. The group employs direct and double extortion tactics, using phishing emails to gain initial access to target networks. Once inside, they deploy custom ransomware binaries and scripts, often obfuscating their activities to evade detection. Arcus Media operates under a Ransomware-as-a-Service (RaaS) model, allowing affiliates to use their malware and sharing the profits. The group's affiliate program is highly exclusive, requiring referrals and vetting for new members.

Penetration and Persistence Tactics

Arcus Media's infiltration methods include phishing emails with malicious attachments or links. Upon gaining access, they use credential dumping tools like Mimikatz for privilege escalation and create scheduled tasks for persistence. The group is known for disabling security tools and employing obfuscation and encryption techniques to evade detection. These tactics enable them to maintain control over compromised systems and exfiltrate significant amounts of data without triggering security alerts.

Implications and Recommendations

The attack on Braz Assessoria Contábil underscores the critical need for robust cybersecurity measures in the business services sector. Firms must implement stringent access controls, conduct regular security audits, and deploy comprehensive endpoint detection and response solutions. Additionally, ensuring proper data backup and recovery procedures can help mitigate the impact of ransomware attacks and safeguard sensitive information.


Recent Ransomware Attacks

The Recent Ransomware Attacks (RRA) site acts as a watchtower, providing you with near real-time ransomware tracking of attacks, groups and their victims. Given threat actors’ overarching, lucrative success so far, ransomware attacks have become the most ubiquitous, and financially and informationally impactful cyber threat to businesses and organizations today.

The site’s data is generated based on hosting choices of real-world threat actors, and a handful of other trackers. While sanitization efforts have been taken, we cannot guarantee 100% accuracy of the data. Attack updates will be made as source data is reported by reputable sources. By viewing, accessing, or using RRA you acknowledge you are doing so at your own risk.