前言
之前说了怎么写机器码到内存，然后调用。现在说说怎么优化。
用Python发送微信消息给好友
第二次优化
再看一遍c语言的代码
void SendText( wchar_t* wsTextMsg) {
// 发送的好友，filehelper是文件传输助手
wchar_t wsWxId[0x10] = L"filehelper";
WxBaseStruct wxWxid(wsWxId);
// 发送的消息内容
WxBaseStruct wxTextMsg(wsTextMsg);
wchar_t** pWxmsg = &wxTextMsg.buffer;
char buffer[0x3B0] = { 0 };
char wxNull[0x100] = { 0 };
DWORD dllBaseAddress = (DWORD)GetModuleHandleA("WeChatWin.dll");
// 发消息的函数call地址
DWORD callAddress = dllBaseAddress + 0x521D30;
__asm {
lea eax, wxNull;
push 0x1;
push eax;
mov edi, pWxmsg;
push edi;
lea edx, wxWxid;
lea ecx, buffer;
call callAddress;
add esp, 0xC;
}
}上面的代码真正发消息的是asm里面的代码，之前的c代码都是在组装内存数据。那我们是不是可以用Python组装数据，只讲下面的汇编转为机器码写入内存调用，这样就少了很多无用的机器码。
改完的SendText函数如下
wchar_t wsWxId[0x10] = L"filehelper";
wchar_t wsTextMsg[0x100] = L"test";
WxBaseStruct wxWxid(wsWxId);
WxBaseStruct wxTextMsg(wsTextMsg);
wchar_t** pWxmsg = &wxTextMsg.buffer;
char buffer[0x3B0] = { 0 };
char wxNull[0x100] = { 0 };
DWORD dllBaseAddress = (DWORD)GetModuleHandleA("WeChatWin.dll");;
DWORD callAddress = dllBaseAddress + 0x521D30;
void SendText() {
__asm {
lea eax, wxNull;
push 0x1;
push eax;
mov edi, pWxmsg;
push edi;
lea edx, wxWxid;
lea ecx, buffer;
call callAddress;
add esp, 0xC;
}
}
汇编代码：
[]里面包含的类型和变量名其实就是地址，只需要将地址改成用Python构造的地址就可以了
完整代码如下：
import os
import pymem
import ctypes
import time
def convert_addr(addr):
if isinstance(addr, int):
addr = hex(addr)
if addr.startswith("0x") or addr.startswith("0X"):
addr = addr[2:]
if len(addr) < 8:
addr = (8-len(addr))*'0' + addr
tmp = []
for i in range(0, 8, 2):
tmp.append(addr[i:i+2])
tmp.reverse()
return ''.join(tmp)
def WxBaseStruct(process_handle, content):
struct_address = pymem.memory.allocate_memory(process_handle, 20)
bcontent = content.encode('utf-16le')
content_address = pymem.memory.allocate_memory(process_handle, len(bcontent)+16)
pymem.ressources.kernel32.WriteProcessMemory(process_handle, content_address, bcontent, len(bcontent), None)
pymem.memory.write_int(process_handle, struct_address, content_address)
pymem.memory.write_int(process_handle, struct_address+0x4, len(content))
pymem.memory.write_int(process_handle, struct_address+0x8, len(content)*2)
pymem.memory.write_int(process_handle, struct_address+0xC, 0)
pymem.memory.write_int(process_handle, struct_address+0x10, 0)
return struct_address, content_address
def start_thread(process_handle, address, params=None):
params = params or 0
NULL_SECURITY_ATTRIBUTES = ctypes.cast(0, pymem.ressources.structure.LPSECURITY_ATTRIBUTES)
thread_h = pymem.ressources.kernel32.CreateRemoteThread(
process_handle,
NULL_SECURITY_ATTRIBUTES,
0,
address,
params,
0,
ctypes.byref(ctypes.c_ulong(0))
)
last_error = ctypes.windll.kernel32.GetLastError()
if last_error:
pymem.logger.warning('Got an error in start thread, code: %s' % last_error)
pymem.ressources.kernel32.WaitForSingleObject(thread_h, -1)
return thread_h
def main(wxpid, wxid, msg):
process_handle = pymem.process.open(wxpid)
wxNull_address = pymem.memory.allocate_memory(process_handle, 0x100)
buffer_address = pymem.memory.allocate_memory(process_handle, 0x3B0)
wxid_struct_address, wxid_address = WxBaseStruct(process_handle, wxid)
msg_struct_address, msg_address = WxBaseStruct(process_handle, msg)
process_WeChatWin_handle = pymem.process.module_from_name(process_handle, "WeChatWin.dll")
call_address = process_WeChatWin_handle.lpBaseOfDll + 0x521D30
call_p_address = pymem.memory.allocate_memory(process_handle, 4)
pymem.memory.write_int(process_handle, call_p_address, call_address)
format_code = '''
57
8D05 {wxNull}
6A 01
50
8D3D {wxTextMsg}
57
8D15 {wxWxid}
8D0D {buffer}
FF15 {callAddress}
83C4 0C
5F
C3
'''
shellcode = format_code.format(wxNull=convert_addr(wxNull_address),
wxTextMsg=convert_addr(msg_struct_address),
wxWxid=convert_addr(wxid_struct_address),
buffer=convert_addr(buffer_address),
callAddress=convert_addr(call_p_address))
shellcode = bytes.fromhex(shellcode.replace(' ', '').replace('\n', ''))
shellcode_address = pymem.memory.allocate_memory(process_handle, len(shellcode)+5)
pymem.ressources.kernel32.WriteProcessMemory(process_handle, shellcode_address, shellcode, len(shellcode), None)
thread_h = start_thread(process_handle, shellcode_address)
time.sleep(0.5)
pymem.memory.free_memory(process_handle, wxNull_address)
pymem.memory.free_memory(process_handle, buffer_address)
pymem.memory.free_memory(process_handle, wxid_struct_address)
pymem.memory.free_memory(process_handle, wxid_address)
pymem.memory.free_memory(process_handle, msg_struct_address)
pymem.memory.free_memory(process_handle, msg_address)
pymem.memory.free_memory(process_handle, call_p_address)
pymem.memory.free_memory(process_handle, shellcode_address)
pymem.process.close_handle(process_handle)
if __name__ == "__main__":
wxpid = 16892
wxid = "filehelper"
msg = "python test"
main(wxpid, wxid, msg)第三次优化
直接在Python里写汇编，然后自动转机器码写入内存。使用的是Python的keystone库
# -*- coding: utf-8 -*-
import os
import pymem
import ctypes
import time
from keystone import Ks, KS_ARCH_X86, KS_MODE_32
def asm2code(asm_code, syntax=0):
ks = Ks(KS_ARCH_X86, KS_MODE_32)
bytes_code, _ = ks.asm(asm_code, as_bytes=True)
return bytes_code
def WxBaseStruct(process_handle, content):
struct_address = pymem.memory.allocate_memory(process_handle, 20)
bcontent = content.encode('utf-16le')
content_address = pymem.memory.allocate_memory(process_handle, len(bcontent)+16)
pymem.ressources.kernel32.WriteProcessMemory(process_handle, content_address, bcontent, len(bcontent), None)
pymem.memory.write_int(process_handle, struct_address, content_address)
pymem.memory.write_int(process_handle, struct_address+0x4, len(content))
pymem.memory.write_int(process_handle, struct_address+0x8, len(content)*2)
pymem.memory.write_int(process_handle, struct_address+0xC, 0)
pymem.memory.write_int(process_handle, struct_address+0x10, 0)
return struct_address, content_address
def start_thread(process_handle, address, params=None):
params = params or 0
NULL_SECURITY_ATTRIBUTES = ctypes.cast(0, pymem.ressources.structure.LPSECURITY_ATTRIBUTES)
thread_h = pymem.ressources.kernel32.CreateRemoteThread(
process_handle,
NULL_SECURITY_ATTRIBUTES,
0,
address,
params,
0,
ctypes.byref(ctypes.c_ulong(0))
)
last_error = ctypes.windll.kernel32.GetLastError()
if last_error:
pymem.logger.warning('Got an error in start thread, code: %s' % last_error)
pymem.ressources.kernel32.WaitForSingleObject(thread_h, -1)
return thread_h
def main(wxpid, wxid, msg):
process_handle = pymem.process.open(wxpid)
wxNull_address = pymem.memory.allocate_memory(process_handle, 0x100)
buffer_address = pymem.memory.allocate_memory(process_handle, 0x3B0)
wxid_struct_address, wxid_address = WxBaseStruct(process_handle, wxid)
msg_struct_address, msg_address = WxBaseStruct(process_handle, msg)
process_WeChatWin_handle = pymem.process.module_from_name(process_handle, "WeChatWin.dll")
call_address = process_WeChatWin_handle.lpBaseOfDll + 0x521D30
call_p_address = pymem.memory.allocate_memory(process_handle, 4)
pymem.memory.write_int(process_handle, call_p_address, call_address)
format_asm_code = '''
push edi;
lea eax,dword ptr ds:[{wxNull:#02x}];
push 0x1;
push eax;
lea edi,dword ptr ds:[{wxTextMsg:#02x}];
push edi;
lea edx,dword ptr ds:[{wxWxid:#02x}];
lea ecx,dword ptr ds:[{buffer:#02x}];
call dword ptr ds:[{callAddress:#02x}];
add esp, 0xC;
pop edi;
ret;
'''
asm_code = format_asm_code.format(wxNull=wxNull_address,
wxTextMsg=msg_struct_address,
wxWxid=wxid_struct_address,
buffer=buffer_address,
callAddress=call_p_address)
shellcode = asm2code(asm_code.encode())
shellcode_address = pymem.memory.allocate_memory(process_handle, len(shellcode)+5)
pymem.ressources.kernel32.WriteProcessMemory(process_handle, shellcode_address, shellcode, len(shellcode), None)
thread_h = start_thread(process_handle, shellcode_address)
time.sleep(0.5)
pymem.memory.free_memory(process_handle, wxNull_address)
pymem.memory.free_memory(process_handle, buffer_address)
pymem.memory.free_memory(process_handle, wxid_struct_address)
pymem.memory.free_memory(process_handle, wxid_address)
pymem.memory.free_memory(process_handle, msg_struct_address)
pymem.memory.free_memory(process_handle, msg_address)
pymem.memory.free_memory(process_handle, call_p_address)
pymem.memory.free_memory(process_handle, shellcode_address)
pymem.process.close_handle(process_handle)
if __name__ == "__main__":
wxpid = 18604
wxid = "filehelper"
msg = "python test msg"
main(wxpid, wxid, msg)到此这篇关于Python实现向好友发送微信消息优化篇的文章就介绍到这了,更多相关Python微信消息内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
