For as long as its signing certificate remains valid, the driver may be abused for malicious purposes. MiHoYo, the developer of Genshin Impact, has been informed of the vulnerable driver and the potential abuse, but the driver is still valid at this time.
The point of this case is that a legitimate device driver module with valid code signing has the capability to bypass privileges from user mode to kernel mode,” the cybersecurity firm notes. “It is still rare to find a module with code signing as a device driver that can be abused. According to Trend Micro, the adversary was likely attempting to mass-deploy the ransomware from the domain controller, via a startup/logon script. The driver’s versatility, coupled with the existence of well-made PoC code suggests that the driver is likely used more prevalently than some known rootkits, the researchers say.Īs part of an analyzed attack, the threat actor was seen deploying to the domain controller a malicious Windows installer posing as AVG Internet Security, which dropped and executed, among other files, the vulnerable driver.
The mhyprot2.sys module is easy to obtain and proof-of-concept (PoC) code exploiting it to read/write kernel memory, terminate processes, and enumerate system resources has been available publicly since October 2020, shortly after Genshin Impact was released.
Since mhyprot2.sys can be integrated into any malware, we are continuing investigations to determine the scope of the driver,” the company’s security researchers say. The threat actor aimed to deploy ransomware within the victim’s device and then spread the infection. “This ransomware was simply the first instance of malicious activity we noted. What’s more, Trend Micro believes that other malware families might soon start targeting it as well. The use of the driver, Trend Micro notes, is independent of the Genshin Impact game, and remains on user devices even after the game has been uninstalled.Īccording to the cybersecurity firm, the driver is signed with a valid certificate, meaning that it continues to work on users’ computers, thus exposing them to malicious abuse. The driver, mhyprot2.sys, provides anti-cheat functions, but can be used to bypass privileges from user mode to kernel mode and to kill the processes and services associated with endpoint protection applications. A vulnerable anti-cheat driver for the Genshin Impact video game has been abused by a threat actor to disable antivirus programs to facilitate the deployment of ransomware, cybersecurity firm Trend Micro reports.
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