Mapping injection is a process injection technique that avoids the usage of common monitored syscall VirtualAllocEx, WriteProcessMemory and CreateRemoteThread.

With this technique you will have a different syscall pattern from the classic process injection that is:
VirtualAllocEx -> WriteProcessMemory -> CreateRemoteThread.
In this technique you will have the following syscall pattern:
OpenProcess() -> (CreateFileMapping() -> MapViewOfFile3() [current process] -> MapViewOfFile3() [target process]) x 2 times -> NtSetInformationProcess()

Supported OS: Windows 10 / Windows Server 2016, version 1703 (build 10.0.15063) and above versions

https://splintercod3.blogspot.com/p/weaponizing-mapping-injection-with.html