## File: syscalls.nim ## Author: nbaertsch ## ## Example usage of 'nimvoke/syscalls' to execute shellcode import winim/lean import ../src/nimvoke/syscalls # 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, 0x48, 0x8b, 0x44, 0x24, 0x20, 0x0f, 0xbe, 0x00, 0x89, 0x44, 0x24, 0x04, 0x8b, 0x44, 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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] when isMainModule: var hProcess: HANDLE = 0xFFFFFFFFFFFFFFFF # current process objectAttributes: OBJECT_ATTRIBUTES = OBJECT_ATTRIBUTES() shellcodeSize: SIZE_T = shellcode.len.SIZE_T baseAddr: PVOID status = syscall(NtAllocateVirtualMemory, hProcess, &baseAddr, 0, &shellcodeSize, MEM_RESERVE or MEM_COMMIT, PAGE_READWRITE ) bytesWritten: SIZE_T # ZwWriteVirtualMemory status = syscall(ZwWriteVirtualMemory, hProcess, baseAddr, &shellcode[0], shellcodeSize.SIZE_T, cast[PSIZE_T](&bytesWritten) ) # ZwProtectVirtualMemory var oldProtect: DWORD status = syscall(ZwProtectVirtualMemory, hProcess, &baseAddr, &shellcodeSize, PAGE_EXECUTE_READ, &oldProtect ) # ZwCreateThreadEx var hThread: HANDLE status = syscall(ZwCreateThreadEx, &hThread, GENERIC_EXECUTE, NULL, hProcess, baseAddr, NULL, FALSE, NULL, NULL, NULL, NULL ) # ZwWaitForSingleObject status = syscall(ZwWaitForSingleObject, hThread, FALSE, 0 )