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by JPLeRouzic 2483 days ago
Perhaps here [0] ?

Starting IIS 4.0, Microsoft has added a kernel mode support driver (SPUD.SYS). This driver also calls KeAddSystemServiceTable function to add its own system services. This fills an entry in third array element of KeServiceDescriptorTableShadow. Hence, its services will start from 0x3000.

[0] https://community.osr.com/discussion/20626/system-service-di...