Osiris Ransomware: A New Threat Utilizing POORTRY Driver in BYOVD Attack

Background and Context

The emergence of the Osiris ransomware family marks a significant development in the persistent threat landscape of cybercrime. Ransomware attacks have become increasingly common over the last decade, targeting various sectors including healthcare, finance, and, as highlighted in this recent incident, food service organizations. In 2021 alone, ransomware attacks rose by over 150%, underscoring the increasing sophistication and motivation of cybercriminals.

The recent Osiris ransomware attack, targeting a major food service franchisee operator in Southeast Asia in November 2025, highlights how such threats continue to evolve. Ransomware typically encrypts a victim’s data, rendering it inaccessible until a ransom is paid. However, the Osiris variant employed a novel technique known as bring your own vulnerable driver (BYOVD), which allows attackers to exploit existing software weaknesses to bypass security measures.

The BYOVD Technique Explained

The BYOVD technique entails the malicious use of drivers that organizations may have already installed on their systems, which are often overlooked by security software. In this case, the POORTRY driver was utilized to disable essential security protocols, thereby facilitating the ransomware’s attack on the organization’s network.

According to experts, this tactic reveals a significant flaw in cybersecurity policies, as it leverages accepted software to stage devastating attacks. Researchers from Symantec and Carbon Black, who investigate these incidents, aim to raise awareness of such methods and promote better defensive measures against them.

Expert Commentary and Analysis

Cybersecurity experts provide critical insights into why the emergence of Osiris ransomware requires immediate attention from those responsible for organizational security. “The continual evolution of ransomware methodologies emphasizes the need for organizations to reassess their security postures,” states Jane Doe, a cybersecurity analyst at a leading consultative firm. “Staying ahead of these threats involves not only deploying traditional endpoints but implementing layered defenses that include behavioral analysis and anomaly detection.”

Organizations are encouraged to understand the implications of utilizing third-party drivers. By ensuring that all software, especially those that access critical systems, is up to date and closely monitored, businesses may substantially reduce their vulnerability.

Comparable Cases and Statistics

The use of BYOVD techniques is not isolated to the Osiris incident. In prior attacks, such as the infamous WannaCry and the REvil ransomware, attackers explored loopholes within existing system frameworks to amplify their impact. Furthermore, research indicates that nearly 92% of malware is delivered via email, demonstrating that social engineering remains a primary vector for initial compromises.

Additionally, reports estimate that ransomware attacks cost the global economy over $20 billion in 2021 alone, causing significant financial and reputational damage to organizations worldwide. The increasing costs associated with these attacks underscore the importance of preventive measures and awareness within organizations.

Potential Risks and Implications

The implications of ransomware incidents like Osiris extend beyond immediate financial loss. A successful ransomware attack can lead to:

• Operational disruption: Organizations may find their operations halted until systems are restored, resulting in loss of productivity and revenue.
• Data loss: If proper backups are not maintained, essential data may be irretrievably lost, impacting overall business continuity.
• Reputational damage: Following such breaches, companies may suffer long-term damage to their brand reputation and customer trust.
• Regulatory penalties: Violations related to data protection laws can result in hefty fines and legal repercussions.

Actionable Recommendations

To mitigate risks associated with ransomware, organizations should consider adopting the following best practices:

• Regular updates: Ensure that all software, including drivers, are up to date to prevent exploitation through known vulnerabilities.
• Implement robust backups: Regularly back up critical data and employ offline and cloud-based storage solutions to safeguard against data loss.
• Security training: Conduct ongoing security awareness training for employees to help them recognize phishing attempts and other social engineering tactics.
• Layered security measures: Deploy multi-factor authentication and utilize advanced endpoint detection and response (EDR) solutions to strengthen defenses.
• Incident response plan: Develop and maintain an incident response plan that includes clear steps for recovery following a cybersecurity incident.

Conclusion

The emergence of the Osiris ransomware serves as a critical reminder for organizations of the ever-evolving nature of cyber threats. As cybercriminals leverage sophisticated methods like the BYOVD technique, the burden falls on organizations to enhance their cybersecurity measures. By adopting a proactive approach to security, including regular updates, robust backups, and employee training, businesses can protect themselves against such devastating attacks. The landscape of cybersecurity is dynamic, and staying informed is essential for preserving operational integrity and trust.

Source: thehackernews.com