mirror of
https://github.com/naksyn/PythonMemoryModule
synced 2026-06-06 16:24:25 +00:00
command line support (partial) via PEB stomping
This update include support to passing command line parameters to unmanaged exe via PEB stomping. This technique is not working with every executable since it depends on which functions are used to pass arguments. Generally, to get a universally working technique would be required to hook GetCommandlineA GetCommandlineW __getmainargs and __wgetmainargs since PEB stomping won't cover all cases, more details here: https://blog-30cm-tw.translate.goog/2020/08/windows-c-mainargc-argv.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=it&_x_tr_pto=wapp However, during my testing I found that mimikatz and several go binaries are working just by doing PEB stomping. On the other hand, cmdline passing via PEB stomping alone to mingw and VS compiled binaries won't likely work.
This commit is contained in:
naksyn
@@ -0,0 +1,438 @@
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import struct
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import ctypes
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import os
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import sys
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import windows
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import windows.utils as utils
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import windows.generated_def as gdef
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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.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_path):
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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.fullname.lower() == dll_path.lower() 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_path + "\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_path + "\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_path))
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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_path)
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return perform_manual_getproc_loadlib_64(target, dll_path)
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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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code += x86.Mov('EAX', Py_Initialize)
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code += x86.Call('EAX')
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# https://docs.python.org/3/c-api/init.html#c.PyEval_InitThreads
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code += x86.Mov('EAX', PyEval_InitThreads)
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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', Py_Initialize)
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code += x64.Call('RAX')
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# https://docs.python.org/3/c-api/init.html#c.PyEval_InitThreads
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code += x64.Mov('RAX', PyEval_InitThreads)
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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 get_dll_name_from_python_version():
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version = sys.version_info
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return "python{v.major}{v.minor}.dll".format(v=version)
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def find_python_dll_to_inject(target_bitness):
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pydll_name = get_dll_name_from_python_version()
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if windows.current_process.bitness == target_bitness:
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# We can inject our own DLL
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pymodules = [m for m in windows.current_process.peb.modules if m.name == pydll_name]
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assert len(pymodules) == 1
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return pymodules[0].fullname
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# Okay, so we need to find the DLL to inject.
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# Problem is, for py3 the DLL is not un system32, so we need for search for it
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# Simpler solution is the registry
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# Add a check using %PATH% ?
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assert windows.system.bitness == 64, "How can we have process of different bitness on 32b system ?"
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if sys.version_info.major == 2:
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# Python2 DLL are located in system32/syswow64
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# We know that we are looking to DLL of the other bitness
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if windows.current_process.bitness == 32:
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# We need to check that the real system32\pythonXX.dll exists
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systempath = "sysnative"
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else:
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# We need to check that the wow64 system32\pythonXX.dll exists
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systempath = "syswow64"
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if os.path.exists(os.path.join(os.environ["windir"], systempath, pydll_name)):
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# In any way (32b ou 64b) the target process will load system32\pydll
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# If the target is 32b the wow64 layer will translate it
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return os.path.join(os.environ["windir"], "system32", pydll_name)
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# If not found this way -> may mean we have a install only for a user, give registry a try
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# Python 3 dll must be located using the registry
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for base_key in "HKEY_LOCAL_MACHINE", "HKEY_CURRENT_USER":
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# Open the registry in 64b view regardless of current process bitness
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regbase = windows.system.registry(base_key, gdef.KEY_WOW64_64KEY | gdef.KEY_READ)
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# we cannot use sys.winver as we are looking for the OTHER version
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# But from Python <PCbuild/python.props> it looks like format is
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# {Major}.{Minor}{-32}(for 32b build)
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# This code do not handle -test version
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winver_base = sys.winver[:3] # major-minor
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if target_bitness == 64:
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pyinstallkeys = [regbase(r"SOFTWARE\Python\PythonCore")(winver_base)]
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else:
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pyinstallkeys = [regbase(r"SOFTWARE\Python\PythonCore")(winver_base + "-32"),
|
||||
regbase(r"SOFTWARE\WOW6432Node\Python\PythonCore")(winver_base + "-32")]
|
||||
for pyinstallkey in pyinstallkeys:
|
||||
if not pyinstallkey.exists:
|
||||
continue
|
||||
try:
|
||||
pyinstallpath = pyinstallkey("InstallPath")[""].value
|
||||
final_path = os.path.join(pyinstallpath, pydll_name)
|
||||
assert os.path.exists(final_path), "Could not find <{0}> pydll referenced from registry".format(final_path)
|
||||
return final_path
|
||||
except WindowsError as e:
|
||||
if e.winerror != gdef.ERROR_FILE_NOT_FOUND:
|
||||
raise
|
||||
# Not found
|
||||
continue
|
||||
# Could not find a valid installation
|
||||
raise ValueError("Could not find a path for python-dll <{0}>({1}bits)".format(sys.winver, target_bitness))
|
||||
|
||||
|
||||
|
||||
def execute_python_code(process, code):
|
||||
# Cache the value ?
|
||||
py_dll_name = get_dll_name_from_python_version()
|
||||
pydll_path = find_python_dll_to_inject(process.bitness)
|
||||
if sys.version_info.major == 3:
|
||||
# FOr py3, we may have a per-user install.
|
||||
# Meaning that the vcruntime140.dll will not be in the injected process path
|
||||
# Find it & load-it as well, it should be in the same directory as pythonxx.dll
|
||||
vc_runtime_dll = os.path.join(os.path.dirname(pydll_path), "vcruntime140.dll")
|
||||
load_dll_in_remote_process(process, vc_runtime_dll)
|
||||
# Try to inject the vcrunt
|
||||
load_dll_in_remote_process(process, pydll_path)
|
||||
shellcode, pythoncode = inject_python_command(process, code, py_dll_name)
|
||||
t = process.create_thread(shellcode, pythoncode)
|
||||
return t
|
||||
|
||||
|
||||
retrieve_exc = r"""
|
||||
import traceback
|
||||
import sys
|
||||
addr = {0}
|
||||
txt = "".join(traceback.format_exception(sys.last_type, sys.last_value, sys.last_traceback))
|
||||
import ctypes
|
||||
|
||||
size = ctypes.c_uint.from_address(addr)
|
||||
size.value = len(txt)
|
||||
buff = (ctypes.c_char * len(txt)).from_address(addr + ctypes.sizeof(ctypes.c_uint))
|
||||
buff[:] = txt.encode()
|
||||
"""
|
||||
|
||||
def retrieve_last_exception_data(process):
|
||||
with process.allocated_memory(0x1000) as mem:
|
||||
execute_python_code(process, retrieve_exc.format(mem)).wait()
|
||||
size = struct.unpack("<I", process.read_memory(mem, ctypes.sizeof(ctypes.c_uint)))[0]
|
||||
data = process.read_memory(mem + ctypes.sizeof(ctypes.c_uint), size)
|
||||
return data
|
||||
|
||||
class RemotePythonError(Exception):
|
||||
pass
|
||||
|
||||
def safe_execute_python(process, code):
|
||||
t = execute_python_code(process, code)
|
||||
t.wait() # Wait terminaison of the thread
|
||||
if t.exit_code == 0:
|
||||
return True
|
||||
if t.exit_code == STATUS_THREAD_IS_TERMINATING or process.is_exit:
|
||||
raise WindowsError("{0} died during execution of python command".format(process))
|
||||
if t.exit_code != 0xffffffff:
|
||||
raise ValueError("Unknown exit code {0}".format(hex(t.exit_code)))
|
||||
data = retrieve_last_exception_data(process)
|
||||
raise RemotePythonError(data)
|
||||
Reference in New Issue
Block a user