mirror of
https://github.com/hakril/PythonForWindows
synced 2026-06-08 14:31:45 +00:00
hakril
385 lines
15 KiB
Python
385 lines
15 KiB
Python
import struct
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import ctypes
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import os
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import windows
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import windows.utils as utils
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from .native_exec import simple_x86 as x86
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from .native_exec import simple_x64 as x64
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from windows.generated_def import STATUS_THREAD_IS_TERMINATING
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from windows.native_exec.nativeutils import GetProcAddress64, GetProcAddress32
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from windows.dbgprint import dbgprint
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class InjectionFailedError(WindowsError):
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pass
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def get_kernel32_dll_name():
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# Our injected shellcode search for 'kernel32.dll' with a strcmp
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# The BaseDllName of k32 might be 'KERNEL32.DLL' or 'kernel32.dll' on different system32
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# We base the name on our own loaded kernel32
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k32 = [m for m in windows.current_process.peb.modules if m.name == "kernel32.dll"]
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assert len(k32) == 1
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k32name = k32[0].BaseDllName.str
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return (k32name + "\x00").encode("utf-16-le")
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def perform_manual_getproc_loadlib_32(target, dll_name):
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dll = get_kernel32_dll_name()
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api = "LoadLibraryA\x00"
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dll_to_load = dll_name + "\x00"
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RemoteManualLoadLibray = x86.MultipleInstr()
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code = RemoteManualLoadLibray
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code += x86.Mov("ECX", x86.mem("[ESP + 4]"))
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code += x86.Push(x86.mem("[ECX + 4]"))
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code += x86.Push(x86.mem("[ECX]"))
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code += x86.Call(":FUNC_GETPROCADDRESS32")
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code += x86.Push(x86.mem("[ECX + 8]"))
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code += x86.Call("EAX") # LoadLibrary
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code += x86.Pop("ECX")
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code += x86.Pop("ECX")
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code += x86.Ret()
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RemoteManualLoadLibray += GetProcAddress32
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with target.allocated_memory(0x1000) as addr:
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addr2 = addr + len(dll)
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addr3 = addr2 + len(api)
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addr4 = addr3 + len(dll_to_load)
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target.write_memory(addr, dll)
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target.write_memory(addr2, api)
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target.write_memory(addr3, dll_to_load)
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target.write_qword(addr4, addr)
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target.write_qword(addr4 + 4, addr2)
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target.write_qword(addr4 + 0x8, addr3)
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t = target.execute(RemoteManualLoadLibray.get_code(), addr4)
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t.wait()
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if not t.exit_code:
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raise InjectionFailedError("Injection of <{0}> failed".format(dll_name))
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return True
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def perform_manual_getproc_loadlib_64(target, dll_name):
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dll = get_kernel32_dll_name()
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api = "LoadLibraryA\x00"
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dll_to_load = dll_name + "\x00"
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RemoteManualLoadLibray = x64.MultipleInstr()
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code = RemoteManualLoadLibray
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code += x64.Mov("R15", "RCX")
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code += x64.Mov("RCX", x64.mem("[R15 + 0]"))
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code += x64.Mov("RDX", x64.mem("[R15 + 8]"))
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code += x64.Call(":FUNC_GETPROCADDRESS64")
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code += x64.Mov("RCX", x64.mem("[R15 + 0x10]"))
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code += x64.Push("RCX")
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code += x64.Push("RCX")
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code += x64.Push("RCX")
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code += x64.Call("RAX") # LoadLibrary
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code += x64.Pop("RCX")
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code += x64.Pop("RCX")
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code += x64.Pop("RCX")
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code += x64.Ret()
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RemoteManualLoadLibray += GetProcAddress64
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with target.allocated_memory(0x1000) as addr:
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addr2 = addr + len(dll)
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addr3 = addr2 + len(api)
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addr4 = addr3 + len(dll_to_load)
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target.write_memory(addr, dll)
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target.write_memory(addr2, api)
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target.write_memory(addr3, dll_to_load)
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target.write_qword(addr4, addr)
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target.write_qword(addr4 + 8, addr2)
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target.write_qword(addr4 + 0x10, addr3)
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t = target.execute(RemoteManualLoadLibray.get_code(), addr4)
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t.wait()
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if not t.exit_code:
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raise InjectionFailedError("Injection of <{0}> failed".format(dll_name))
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return True
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def generate_simple_LoadLibraryW_64(load_libraryW, remote_store):
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code = RemoteLoadLibrayStub = x64.MultipleInstr()
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# code += x64.Int3()
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code += x64.Mov("RAX", load_libraryW)
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code += (x64.Push("RDI") * 5) # Prepare stack
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code += x64.Call("RAX")
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code += (x64.Pop("RDI") * 5) # Clean stack
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code += x64.Mov(x64.deref(remote_store), "RAX")
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code += x64.Ret()
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return RemoteLoadLibrayStub.get_code()
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def perform_manual_getproc_loadlib(target, *args, **kwargs):
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if target.bitness == 32:
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return perform_manual_getproc_loadlib_32(target, *args, **kwargs)
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return perform_manual_getproc_loadlib_64(target, *args, **kwargs)
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def load_dll_in_remote_process(target, dll_name):
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# if target.bitness == 64:
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# import pdb;pdb.set_trace()
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rpeb = target.peb
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if rpeb.Ldr:
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# LDR est parcourable, ca va etre deja plus simple..
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modules = rpeb.modules
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if any(mod.name == dll_name for mod in modules):
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# DLL already loaded
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dbgprint("DLL already present in target", "DLLINJECT")
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return False
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k32 = [mod for mod in modules if mod.name.lower() == "kernel32.dll"]
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if k32:
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# We have kernel32 \o/
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k32 = k32[0]
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try:
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load_libraryW = k32.pe.exports["LoadLibraryW"]
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except KeyError:
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raise ValueError("Kernel32 have no export <LoadLibraryA> (wtf)")
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with target.allocated_memory(0x1000) as addr:
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if target.bitness == 32:
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target.write_memory(addr, (dll_name + "\x00").encode('utf-16le'))
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t = target.create_thread(load_libraryW, addr)
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t.wait()
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module_baseaddr = t.exit_code
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else:
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# For 64b target we need a special stub as the return value of
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# load_libraryW does not fit in t.exit_code (DWORD)
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retval_addr = addr
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target.write_ptr(retval_addr, 0)
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addr += ctypes.sizeof(ctypes.c_ulonglong)
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full_dll_name = (dll_name + "\x00").encode('utf-16le')
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target.write_memory(addr, full_dll_name)
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param_addr = addr
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addr += len(full_dll_name)
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shellcode_addr = addr
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shellcode = generate_simple_LoadLibraryW_64(load_libraryW, retval_addr)
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target.write_memory(shellcode_addr, shellcode)
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t = target.create_thread(shellcode_addr, param_addr)
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t.wait()
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module_baseaddr = target.read_ptr(retval_addr)
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if not module_baseaddr:
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raise InjectionFailedError(u"Injection of <{0}> failed".format(dll_name))
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dbgprint("DLL Injected via LoadLibray", "DLLINJECT")
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# Cannot return the full return value of load_libraryW in 64b target.. (exit_code is a DWORD)
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return module_baseaddr
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# Hardcore mode
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# We don't have k32 or PEB->Ldr
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# Go inject a GetProcAddress(LoadLib) + LoadLib shellcode :D
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dbgprint("DLL Via manual getproc / loadlib", "DLLINJECT")
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if target.bitness == 32:
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return perform_manual_getproc_loadlib_32(target, dll_name)
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return perform_manual_getproc_loadlib_64(target, dll_name)
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python_function_32_bits = {}
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def generate_python_exec_shellcode_32(target, PyDll):
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pymodule = [mod for mod in target.peb.modules if mod.name == PyDll][0]
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base = pymodule.baseaddr
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if not python_function_32_bits:
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Py_exports = pymodule.pe.exports
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python_function_32_bits["PyEval_InitThreads"] = Py_exports["PyEval_InitThreads"] - base
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python_function_32_bits["Py_IsInitialized"] = Py_exports["Py_IsInitialized"] - base
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python_function_32_bits["PyGILState_Release"] = Py_exports["PyGILState_Release"] - base
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python_function_32_bits["PyGILState_Ensure"] = Py_exports["PyGILState_Ensure"] - base
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python_function_32_bits["PyEval_SaveThread"] = Py_exports["PyEval_SaveThread"] - base
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python_function_32_bits["Py_Initialize"] = Py_exports["Py_Initialize"] - base
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python_function_32_bits["PyRun_SimpleString"] = Py_exports["PyRun_SimpleString"] - base
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Py_exports = python_function_32_bits
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PyEval_InitThreads = Py_exports["PyEval_InitThreads"] + base
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Py_IsInitialized = Py_exports["Py_IsInitialized"] + base
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PyGILState_Release = Py_exports["PyGILState_Release"] + base
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PyGILState_Ensure = Py_exports["PyGILState_Ensure"] + base
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PyEval_SaveThread = Py_exports["PyEval_SaveThread"] + base
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Py_Initialize = Py_exports["Py_Initialize"] + base
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PyRun_SimpleString = Py_exports["PyRun_SimpleString"] + base
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code = x86.MultipleInstr()
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code += x86.Mov('EAX', Py_IsInitialized)
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code += x86.Call('EAX')
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code += x86.Mov("EDI", "EAX")
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code += x86.Cmp("EAX", 0)
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code += x86.Jnz(":DO_ENSURE")
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# Python Initilisation code
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# init multithread (for other injection)
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code += x86.Mov('EAX', PyEval_InitThreads)
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code += x86.Call('EAX')
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code += x86.Mov('EAX', Py_Initialize)
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code += x86.Call('EAX')
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code += x86.Label(":DO_ENSURE")
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code += x86.Mov('EAX', PyGILState_Ensure)
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code += x86.Call('EAX')
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code += x86.Push('EAX')
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# Get the string to execute from parameters
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code += x86.Mov("EAX", x86.mem("[ESP + 0x8]"))
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code += x86.Push('EAX')
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code += x86.Mov('EAX', PyRun_SimpleString)
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code += x86.Call('EAX')
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code += x86.Mov("ESI", "EAX")
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code += x86.Mov('EAX', PyGILState_Release)
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code += x86.Call('EAX')
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code += x86.Pop('EAX')
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code += x86.Cmp("EDI", 0)
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code += x86.Jnz(":RETURN")
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# If PyEval_InitThreads was called (init done in this thread)
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# We must release the GIL
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code += x86.Mov('EAX', PyEval_SaveThread)
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code += x86.Call('EAX')
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code += x86.Label(":RETURN")
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code += x86.Mov("EAX", "ESI")
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code += x86.Pop("EDI")
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code += x86.Ret()
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return code.get_code()
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python_function_64_bits = {}
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def generate_python_exec_shellcode_64(target, PyDll):
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pymodule = [mod for mod in target.peb.modules if mod.name == PyDll][0]
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base = pymodule.baseaddr
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if not python_function_64_bits:
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Py_exports = pymodule.pe.exports
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python_function_64_bits["PyEval_InitThreads"] = Py_exports["PyEval_InitThreads"] - base
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python_function_64_bits["Py_IsInitialized"] = Py_exports["Py_IsInitialized"] - base
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python_function_64_bits["PyGILState_Release"] = Py_exports["PyGILState_Release"] - base
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python_function_64_bits["PyGILState_Ensure"] = Py_exports["PyGILState_Ensure"] - base
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python_function_64_bits["PyEval_SaveThread"] = Py_exports["PyEval_SaveThread"] - base
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python_function_64_bits["Py_Initialize"] = Py_exports["Py_Initialize"] - base
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python_function_64_bits["PyRun_SimpleString"] = Py_exports["PyRun_SimpleString"] - base
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Py_exports = python_function_64_bits
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PyEval_InitThreads = Py_exports["PyEval_InitThreads"] + base
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Py_IsInitialized = Py_exports["Py_IsInitialized"] + base
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PyGILState_Release = Py_exports["PyGILState_Release"] + base
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PyGILState_Ensure = Py_exports["PyGILState_Ensure"] + base
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PyEval_SaveThread = Py_exports["PyEval_SaveThread"] + base
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Py_Initialize = Py_exports["Py_Initialize"] + base
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PyRun_SimpleString = Py_exports["PyRun_SimpleString"] + base
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Reserve_space_for_call = x64.MultipleInstr([x64.Push('RDI')] * 4)
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Clean_space_for_call = x64.MultipleInstr([x64.Pop('RDI')] * 4)
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code = x64.MultipleInstr()
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# Do stack alignement
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code += x64.Push('RCX')
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code += Reserve_space_for_call
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code += x64.Mov('RAX', Py_IsInitialized)
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code += x64.Call('RAX')
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code += x64.Mov("RDI", "RAX")
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code += x64.Cmp("RAX", 0)
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code += x64.Jnz(":DO_ENSURE")
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code += x64.Mov('RAX', PyEval_InitThreads)
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code += x64.Call('RAX')
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code += x64.Mov('RAX', Py_Initialize)
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code += x64.Call('RAX')
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code += x64.Label(":DO_ENSURE")
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code += x64.Mov('RAX', PyGILState_Ensure)
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code += x64.Call('RAX')
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code += x64.Mov('R15', 'RAX')
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code += x64.Mov("RCX", x64.mem("[RSP + 0x20]"))
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code += x64.Mov('RAX', PyRun_SimpleString)
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code += x64.Call('RAX')
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code += x64.Mov('RCX', 'R15')
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code += x64.Mov('R15', 'RAX')
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code += x64.Mov('RAX', PyGILState_Release)
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code += x64.Call('RAX')
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code += x64.Cmp("RDI", 0)
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code += x64.Jnz(":RETURN")
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# If PyEval_InitThreads was called (init done in this thread)
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# We must release the GIL
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code += x64.Mov('RAX', PyEval_SaveThread)
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code += x64.Call('RAX')
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code += x64.Label(":RETURN")
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code += Clean_space_for_call
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# Remove stack alignement
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code += x64.Pop('RCX')
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code += x64.Mov("RAX", "R15")
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code += x64.Ret()
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return code.get_code()
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def inject_python_command(target, code_injected, PYDLL):
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"""Postulate: PYDLL is already loaded in target process"""
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PYCODE = code_injected + "\x00"
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# TODO: free this (how ? when ?)
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remote_python_code_addr = target.virtual_alloc(len(PYCODE))
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target.write_memory(remote_python_code_addr, PYCODE)
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shellcode_addr = getattr(target, "_execute_python_shellcode", None)
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if shellcode_addr is not None:
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return shellcode_addr, remote_python_code_addr
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if target.bitness == 32:
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shellcode_generator = generate_python_exec_shellcode_32
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else:
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shellcode_generator = generate_python_exec_shellcode_64
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shellcode = shellcode_generator(target, PYDLL)
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shellcode_addr = target.virtual_alloc(len(shellcode))
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target.write_memory(shellcode_addr, shellcode)
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target._execute_python_shellcode = shellcode_addr
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return shellcode_addr, remote_python_code_addr
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def validate_python_dll_presence_on_disk(process):
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if windows.current_process.bitness == process.bitness:
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return True
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if windows.current_process.bitness == 32 and process.bitness == 64:
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with windows.utils.DisableWow64FsRedirection():
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if not os.path.exists(r"C:\Windows\system32\python27.dll"):
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raise IOError("Could not find Python DLL to inject")
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return True
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if windows.current_process.bitness == 64 and process.bitness == 32:
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if not os.path.exists(r"C:\Windows\SysWOW64\python27.dll"):
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raise IOError("Could not find Python DLL to inject")
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return True
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raise NotImplementedError("Unknown bitness")
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def execute_python_code(process, code):
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validate_python_dll_presence_on_disk(process)
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load_dll_in_remote_process(process, "python27.dll")
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shellcode, pythoncode = inject_python_command(process, code, "python27.dll")
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t = process.create_thread(shellcode, pythoncode)
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return t
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retrieve_exc = r"""
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import traceback
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import sys
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addr = {0}
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txt = "".join(traceback.format_exception(sys.last_type, sys.last_value, sys.last_traceback))
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import ctypes
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size = ctypes.c_uint.from_address(addr)
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size.value = len(txt)
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buff = (ctypes.c_char * len(txt)).from_address(addr + ctypes.sizeof(ctypes.c_uint))
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buff[:] = txt
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"""
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def retrieve_last_exception_data(process):
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with process.allocated_memory(0x1000) as mem:
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execute_python_code(process, retrieve_exc.format(mem)).wait()
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size = struct.unpack("<I", process.read_memory(mem, ctypes.sizeof(ctypes.c_uint)))[0]
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data = process.read_memory(mem + ctypes.sizeof(ctypes.c_uint), size)
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return data
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class RemotePythonError(Exception):
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pass
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def safe_execute_python(process, code):
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t = execute_python_code(process, code)
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t.wait() # Wait terminaison of the thread
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if t.exit_code == 0:
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return True
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if t.exit_code == STATUS_THREAD_IS_TERMINATING or process.is_exit:
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raise WindowsError("{0} died during execution of python command".format(process))
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if t.exit_code != 0xffffffff:
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raise ValueError("Unknown exit code {0}".format(hex(t.exit_code)))
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data = retrieve_last_exception_data(process)
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raise RemotePythonError(data)
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