A sophisticated cyberattack has targeted vulnerabilities in the vsdatant.sys driver, a component of Checkpoint's ZoneAlarm antivirus software, allowing attackers to bypass critical Windows security features.

The driver, released in 2016, has been exploited in a Bring Your Own Vulnerable Driver (BYOVD) attack, enabling attackers to elevate privileges and access sensitive data.

The vsdatant.sys driver operates with high kernel-level privileges, containing long-known vulnerabilities that allow attackers to exploit crafted Interrupt Request Packets (IRPs).

These flaws, affecting versions of the driver prior to 7.0.362, allow for arbitrary code execution by improperly validating arguments passed to system function handlers.

BYOVD attacks have become increasingly common, with attackers leveraging legitimate but vulnerable drivers to bypass security measures undetected.

In this case, attackers were able to disable Windows' Memory Integrity feature, which is designed to protect critical system processes.

By exploiting flaws in vsdatant.sys, the attackers gained full access to the compromised system, enabling them to steal sensitive information.

To mitigate the risk of such attacks, security experts recommend implementing driver blocklisting, enabling Memory Integrity, and ensuring that all security products are kept up to date.

Users are urged to update their ZoneAlarm installations to the latest version to avoid exposure to these vulnerabilities.