Windows

Syscall Tables : Evolution From NT5 To NT11

Syscall tables are critical components of operating systems, mapping system calls to their respective kernel functions. This article delves into the evolution of Windows syscall tables across various versions, from Windows XP x64 to Windows 11.

It explores the Ntoskrnl, Win32k, and IUM service tables, providing insights into their structures and differences across Windows builds, serving as a vital reference for security researchers and system enthusiasts.

Ntoskrnl Service Tables

Windows 2003 SP2 build 3790 also Windows XP 64;
Windows Vista RTM build 6000;
Windows Vista SP2 build 6002;
Windows 7 SP1 build 7601;
Windows 8 RTM build 9200;
Windows 8.1 build 9600;
Windows 10 TP build 10061;
Windows 10 TH1 build 10240;
Windows 10 TH2 build 10586;
Windows 10 RS1 build 14393;
Windows 10 RS2 build 15063;
Windows 10 RS3 build 16299;
Windows 10 RS4 build 17134;
Windows 10 RS5 build 17763;
Windows 10 19H1 build 18362;
Windows 10 19H2 build 18363;
Windows 10 20H1 build 19041; * Note that 19042, 19043, 19044, 19045 are the same as 19041
Windows Server 2022 build 20348;
Windows 11 21H2 build 22000;
Windows 11 22H2 build 22621;
Windows 11 23H2 build 22631;
Windows 11 24H2 build 26120;
Windows 11 25H2 build 27686;
Windows 11 25H2 build 27695;
Windows 11 25H2 build 27723;
Windows 11 25H2 build 27729.

** located in Compiled\Composition\X86_64\ntos

NT6 (Windows Vista/7/8/8.1) + bonus NT5.2 (Windows XP x64)

NT10 (Windows 10/11)

Win32k Service Tables

Windows Vista RTM build 6000;
Windows 7 SP1 build 7601;
Windows 8 RTM build 9200;
Windows 8.1 build 9600;
Windows 10 TH1 build 10240;
Windows 10 TH2 build 10586;
Windows 10 RS1 build 14393;
Windows 10 RS2 build 15063;
Windows 10 RS3 build 16299;
Windows 10 RS4 build 17134;
Windows 10 RS5 build 17763;
Windows 10 19H1 build 18362;
Windows 10 19H2 build 18363;
Windows 10 20H1 build 19041; * Note that 19042, 19043, 19044, 19045 are the same as 19041
Windows Server 2022 build 20348;
Windows 11 21H2 build 22000;
Windows 11 22H2 build 22621;
Windows 11 23H2 build 22631;
Windows 11 24H2 build 26120;
Windows 11 25H2 build 27686;
Windows 11 25H2 build 27695;
Windows 11 25H2 build 27723;
Windows 11 25H2 build 27729.

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Varshini

Varshini is a Cyber Security expert in Threat Analysis, Vulnerability Assessment, and Research. Passionate about staying ahead of emerging Threats and Technologies.