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Updated search code to look for less memory

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Jazzinghen 2020-05-30 23:33:35 +09:00 committed by Akash Mozumdar
parent cc7d02d8a1
commit 681fc5b628
1 changed files with 36 additions and 69 deletions
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105
texthook/engine/engine.cc
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@ -26,6 +26,7 @@
#include "native/pchooks.h"
//#include <boost/foreach.hpp>
#include <cstdio>
#include <sstream>
#include <string>
// jichi 375/2014: Add offset of pusha/pushad
@ -6629,29 +6630,6 @@ bool InsertNitroplusHook()
* that handles only the text copy is found.
*
* Disassembled code:
* TokyoNecro.exe+B53F7 - 51 - push ecx
* TokyoNecro.exe+B53F8 - E8 3DC80B00 - call TokyoNecro.exe+171C3A
* TokyoNecro.exe+B53FD - 83 C4 04 - add esp,04
* TokyoNecro.exe+B5400 - 8B 4D F4 - mov ecx,[ebp-0C]
* TokyoNecro.exe+B5403 - 33 C0 - xor eax,eax
* TokyoNecro.exe+B5405 - 64 89 0D 00000000 - mov fs:[00000000],ecx
* TokyoNecro.exe+B540C - 8B E5 - mov esp,ebp
* TokyoNecro.exe+B540E - 5D - pop ebp
* TokyoNecro.exe+B540F - C2 0400 - ret 0004
* TokyoNecro.exe+B5412 - CC - int 3
* TokyoNecro.exe+B5413 - CC - int 3
* TokyoNecro.exe+B5414 - CC - int 3
* TokyoNecro.exe+B5415 - CC - int 3
* TokyoNecro.exe+B5416 - CC - int 3
* TokyoNecro.exe+B5417 - CC - int 3
* TokyoNecro.exe+B5418 - CC - int 3
* TokyoNecro.exe+B5419 - CC - int 3
* TokyoNecro.exe+B541A - CC - int 3
* TokyoNecro.exe+B541B - CC - int 3
* TokyoNecro.exe+B541C - CC - int 3
* TokyoNecro.exe+B541D - CC - int 3
* TokyoNecro.exe+B541E - CC - int 3
* TokyoNecro.exe+B541F - CC - int 3
* TokyoNecro.exe+B5420 - 55 - push ebp ; place to hook
* TokyoNecro.exe+B5421 - 8B EC - mov ebp,esp
* TokyoNecro.exe+B5423 - 6A FF - push -01
@ -6668,6 +6646,20 @@ bool InsertNitroplusHook()
* TokyoNecro.exe+B5443 - 8B D9 - mov ebx,ecx
* TokyoNecro.exe+B5445 - C7 45 EC 0F000000 - mov [ebp-14],0000000F
* TokyoNecro.exe+B544C - C7 45 E8 00000000 - mov [ebp-18],00000000
* TokyoNecro.exe+B5453 - C6 45 D8 00 - mov byte ptr [ebp-28],00
* TokyoNecro.exe+B5457 - 8D 70 01 - lea esi,[eax+01]
* TokyoNecro.exe+B545A - 8D 9B 00000000 - lea ebx,[ebx+00000000]
* TokyoNecro.exe+B5460 - 8A 08 - mov cl,[eax]
* TokyoNecro.exe+B5462 - 40 - inc eax
* TokyoNecro.exe+B5463 - 84 C9 - test cl,cl
* TokyoNecro.exe+B5465 - 75 F9 - jne TokyoNecro.exe+B5460
* TokyoNecro.exe+B5467 - 2B C6 - sub eax,esi
* TokyoNecro.exe+B5469 - 52 - push edx
* TokyoNecro.exe+B546A - 8B F8 - mov edi,eax ▷ Search
* TokyoNecro.exe+B546C - 8D 75 D8 - lea esi,[ebp-28] |
* TokyoNecro.exe+B546F - E8 6CE1F4FF - call TokyoNecro.exe+35E0 |
* TokyoNecro.exe+B5474 - C7 45 FC 00000000 - mov [ebp-04],00000000 |
* TokyoNecro.exe+B547B - 8B 8B 84030000 - mov ecx,[ebx+00000384] ▷
*
* Notes:
*
@ -6692,64 +6684,39 @@ bool InsertNitroplusHook()
bool InsertTokyoNecroHook() {
const BYTE bytecodes[] = {
0x8b, 0x4d, 0xf4, // 8B 4D F4 - mov ecx,[ebp-0C]
0x33, 0xc0, // 33 C0 - xor eax,eax
0x64, 0x89, 0x0d, XX4, // 64 89 0D 00000000 - mov fs:[00000000],ecx
0x8b, 0xe5, // 8B E5 - mov esp,ebp
0x5d, // 5D - pop ebp
0xc2, XX2, // C2 0400 - ret 0004
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0xcc, // CC - int 3
0x55, // 55 - push ebp
0x8b, 0xec, // 8B EC - mov ebp,esp
0x6a, 0xff, // 6A FF - push -01
0x68, XX4, // 68 E8613000 - push TokyoNecro.exe+1961E8
0x64, 0xa1, XX4, // 64 A1 00000000 - mov eax,fs:[00000000]
0x50, // 50 - push eax
0x64, 0x89, 0x25, XX4, // 64 89 25 00000000 - mov fs:[00000000],esp
0x83, 0xec, 0x1c, // 83 EC 1C - sub esp,1C
0x8b, 0x55, 0x08, // 8B 55 08 - mov edx,[ebp+08]
0x53, // 53 - push ebx
0x56, // 56 - push esi
0x8B, 0xc2, // 8B C2 - mov eax,edx
0x57, // 57 - push edi
0x8b, 0xd9, // 8B D9 - mov ebx,ecx
0xc7, 0x45, 0xec, XX4, // C7 45 EC 0F000000 - mov [ebp-14],0000000F
0xc7, 0x45, 0xe8, XX4 // C7 45 E8 00000000 - mov [ebp-18],00000000 //
0x8B, 0xF8, // 8B F8 - mov edi,eax
0x8D, 0x75, 0xD8, // 8D 75 D8 - lea esi,[ebp-28]
0xE8, 0x6C, 0xE1, 0xF4, 0xFF, // E8 6CE1F4FF - call TokyoNecro.exe+35E0
0xC7, 0x45, 0xFC, 0x00, 0x00, 0x00, 0x00, // C7 45 FC 00000000 - mov [ebp-04],00000000
0x8B, 0x8B, 0x84, 0x03, 0x00, 0x00 // 8B 8B 84030000 - mov ecx,[ebx+00000384]
};
ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
ULONG addr =
MemDbg::findBytes(bytecodes, sizeof(bytecodes), processStartAddress,
processStartAddress + range);
enum {
addr_offset = 32
}; // distance to the beginning of the function
constexpr ULONG addr_offset = 0xB546A - 0xB5420; // Distance from memory TokyoNecro.exe+B546A to
// TokyoNecro.exe+B5420
if (addr == 0ull) {
ConsoleOutput("vnreng:TokyoNecro: pattern not found");
return false;
}
addr += addr_offset;
addr -= addr_offset;
std::stringstream stream;
stream << std::hex << addr;
std::string debugOut = "vnreng: TokyoNecro. Hook address: " + stream.str();
ConsoleOutput(debugOut.c_str());
enum { push_ebp = 0x55 }; // OPCode for function begin
if (*(BYTE *)addr != push_ebp) {
// This should never happen
ConsoleOutput("vnreng:TokyoNecro: beginning of the function not found");
return false;
// This should never happen
ConsoleOutput("vnreng:TokyoNecro: beginning of the function not found");
return false;
}
HookParam hp = {};
hp.address = addr;
// The memory address is held at [ebp+08] at TokyoNecro.exe+B543B, meaning that at
@ -6759,10 +6726,10 @@ bool InsertTokyoNecroHook() {
// using the data in the registers
hp.offset = 0x4;
hp.type = USING_STRING;
ConsoleOutput("vnreng: INSERT TokyoNecro");
NewHook(hp, "TokyoNecro");
ConsoleOutput("vnreng: INSERT TokyoNecro");
return true;
}