Osiris ransomware emerges, leveraging BYOVD technique to kill security tools

Security Affairs

January 24, 2026 at 6:17 PM

Actively Exploited

Overview

A new ransomware strain called Osiris was identified in a November 2025 attack targeting a significant food service franchise in Southeast Asia. Researchers from Symantec and Carbon Black reported that the attackers used a malicious driver known as POORTRY through a technique called Bring Your Own Vulnerable Driver (BYOVD) to disable security tools. This method allowed the ransomware to operate without detection, posing a serious risk to the affected organization. With ransomware attacks on the rise, this incident highlights the need for companies to strengthen their defenses against evolving tactics. The incident serves as a reminder for businesses to continuously update their security measures and remain vigilant against such threats.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: Osiris ransomware, POORTRY driver
Action Required: Companies should strengthen their security measures, update antivirus software, and monitor for unusual activity to mitigate risks from ransomware attacks.
Timeline: Newly disclosed

Original Article Summary

Researchers identified a new Osiris ransomware used in a November 2025 attack, abusing the POORTRY driver via BYOVD to disable security tools. Symantec and Carbon Black researchers uncovered a new ransomware strain named Osiris, used in a November 2025 attack against a major Southeast Asian food service franchise operator. The attackers deployed a malicious driver, […]

Impact

Osiris ransomware, POORTRY driver

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Companies should strengthen their security measures, update antivirus software, and monitor for unusual activity to mitigate risks from ransomware attacks.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Ransomware, Update, Symantec.

Read Original Article

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