backengineering/msrexec
Elevate arbitrary MSR writes to kernel execution.
Some research on AltSystemCallHandlers functionality in Windows 10 20H1 18999
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Latest capture 2026-07-28 03:04
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3 observed captures since 2026-06-24. Charts use measured snapshots only.
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Elevate arbitrary MSR writes to kernel execution.
Proof-of-concept kernel driver that hijacks the Windows kernel extension table mechanism to preserve process notify callbacks even when attackers disable standard process notify callbacks.
Poc exploit for CVE-2025-21333 heap-based buffer overflow. It leverages WNF state data and I/O ring IOP_MC_BUFFER_ENTRY
ntoskrnl .data hooks for UM-KM communication
Hook system calls, context switches, page faults and more.
Kernel Driver Utility