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mhook can't hook _loop ;)

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2018-01-03 23:03:48 +01:00
parent 117de6e081
commit bce85be82e
2 changed files with 33 additions and 2 deletions
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31
mhook.txt Normal file
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@@ -0,0 +1,31 @@
_loop original:
00007FFF7CAE978C | 48 89 C8 | mov rax,rcx |
00007FFF7CAE978F | 48 F7 E1 | mul rcx |
00007FFF7CAE9792 | 90 | nop |
00007FFF7CAE9793 | 90 | nop |
00007FFF7CAE9794 | 90 | nop |
00007FFF7CAE9795 | E2 F8 | loop test_cases.7FFF7CAE978F |
00007FFF7CAE9797 | C3 | ret |
_loop hooked:
00007FFF7CAE978C | E9 0F 69 23 00 | jmp <MHook_Hooks::hookLoop> |
00007FFF7CAE9791 | E1 90 | loope test_cases.7FFF7CAE9723 |
00007FFF7CAE9793 | 90 | nop |
00007FFF7CAE9794 | 90 | nop |
00007FFF7CAE9795 | E2 F8 | loop test_cases.7FFF7CAE978F |
00007FFF7CAE9797 | C3 | ret |
trampoline:
00007FFF7CD200C0 | 48 89 C8 | mov rax,rcx |
00007FFF7CD200C3 | 48 F7 E1 | mul rcx |
00007FFF7CD200C6 | E9 C7 96 DC FF | jmp test_cases.7FFF7CAE9792 |
then executes:
00007FFF7CAE9792 | 90 | nop |
00007FFF7CAE9793 | 90 | nop |
00007FFF7CAE9794 | 90 | nop |
00007FFF7CAE9795 | E2 F8 | loop test_cases.7FFF7CAE978F |
But that jumps back into the middle of the jump and thus executes:
00007FFF7CAE978F | 23 00 | and eax,dword ptr ds:[rax] |
00007FFF7CAE9791 | E1 90 | loope test_cases.7FFF7CAE9723 |

4
tester/mhook.cpp
View File

@@ -69,7 +69,7 @@ bool MHook::hook_all(void) {
ret |= Mhook_SetHook((PVOID*)&trueAVX, &MHook_Hooks::hookAVX); ret |= Mhook_SetHook((PVOID*)&trueAVX, &MHook_Hooks::hookAVX);
ret |= Mhook_SetHook((PVOID*)&trueRDRAND, &MHook_Hooks::hookRDRAND); ret |= Mhook_SetHook((PVOID*)&trueRDRAND, &MHook_Hooks::hookRDRAND);
ret |= Mhook_SetHook((PVOID*)&trueLoop, &MHook_Hooks::hookLoop); //ret |= Mhook_SetHook((PVOID*)&trueLoop, &MHook_Hooks::hookLoop);
ret |= Mhook_SetHook((PVOID*)&trueTailRecursion, &MHook_Hooks::hookTail_recursion); ret |= Mhook_SetHook((PVOID*)&trueTailRecursion, &MHook_Hooks::hookTail_recursion);
return ret; return ret;
@@ -80,6 +80,6 @@ bool MHook::unhook_all() {
Mhook_Unhook((PVOID*)&trueBranch) && Mhook_Unhook((PVOID*)&trueBranch) &&
Mhook_Unhook((PVOID*)&trueAVX) && Mhook_Unhook((PVOID*)&trueAVX) &&
Mhook_Unhook((PVOID*)&trueRDRAND) && Mhook_Unhook((PVOID*)&trueRDRAND) &&
Mhook_Unhook((PVOID*)&trueLoop) && //Mhook_Unhook((PVOID*)&trueLoop) &&
Mhook_Unhook((PVOID*)&trueTailRecursion); Mhook_Unhook((PVOID*)&trueTailRecursion);
} }