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1. MALWAREBYTES FOR ANDROID STOPPED WORKING DRIVERS
2. MALWAREBYTES FOR ANDROID STOPPED WORKING WINDOWS 10

The rootkit drivers had network monitoring capabilities using the Windows Filtering Platform. These drivers could only be installed by accounts with elevated rights. Others had rootkit-like capabilities and were designed to run silently in the background. Some fell into the "Endpoint protection killer" category, which were similar to maliciously signed drivers discovered in 2022. Sophos researchers discovered two main types of drivers. Sophos notes that several of the digital certificates appear to have their origin in China, which it bases on the company names associated with the certificates. Windows systems with Secure Boot enabled load only these drivers and refuse to load any drivers not digitally signed.

MALWAREBYTES FOR ANDROID STOPPED WORKING WINDOWS 10

Microsoft introduced a policy in Windows 10 version 1607 that required a valid digital signature for kernel drivers. Other Microsoft services, including Microsoft 365, Azure or Xbox are not affected by the issue according to Microsoft's advisory. Sophos has published hashes of the malicious drivers on GitHub. Administrators should run offline scans on their devices to detect malicious drivers that were installed before March 2, 2023. Windows administrators should make sure that the latest Windows updates are installed and that third-party security software is up to date as well. Microsoft notes that the list is not part of Windows and that it can't be disabled, removed or manipulated.

The revocation list ships with Windows and is updated regularly via Windows Update.

The drivers have been put on the Windows Driver.STL revocation list this list prevents them from being loaded on Windows devices. Microsoft is blocking the malicious drivers and has closed the responsible developer accounts. Some of the signed drivers date back to April 2021 according to Sophos. The researchers identified 133 different drivers, the majority certified, by multiple developer accounts and reported their findings to Microsoft. The researchers discovered that drivers "certified by Microsoft's Windows Hardware Developer Program were being used maliciously in post-exploitation activity". Security researchers at Sophos, Trend Micro and Cisco informed Microsoft about malware in signed drivers in February 2023.