Update README.md

master
xerox 4 years ago
parent 9b4062896f
commit 4351a1680e

@ -4,3 +4,39 @@ reverse engineering of bedaisy.sys (battleyes kernel driver). By registering on
we want and have control flow over subsequent functions.
<img src="https://imgur.com/NFGyGrY.png"/>
# APCS
The below function will be executed in each thread that bedaisy registers an APC on.
```cpp
__int64 __usercall apc_callback@<rax>(char _CL@<cl>, char _BH@<bh>, __int64 *a3@<r9>)
{
__int64 v4; // rbx
__asm { rcl bh, cl }
v4 = *a3;
*(_DWORD *)(v4 + 2160) = RtlWalkFrameChain(*a3 + 0x70, 256i64, 0i64);
return KeSetEvent(v4 + 88, 0i64, 0i64);
}
```
Registeration of APCS:
```cpp
status = PsLookupThreadByThreadId(thread_id, &some_pethread);
v17 = 0;
if ( (int)status >= 0 )
{
allocated_pool = ExAllocatePool(0x200i64, 0x878i64);
allocated_pool_1 = allocated_pool;
allocated_pool_2 = allocated_pool;
if ( allocated_pool )
{
allocated_pool_plus_58 = allocated_pool + 0x58;
KeInitializeEvent((PRKEVENT)(allocated_pool + 0x58), NotificationEvent, 0);
__asm { rcl cx, 0C6h }
LOBYTE(v77) = 0;
KeInitializeApc(allocated_pool_2, some_pethread, 0i64, j_apc_callback, 0i64, 0i64, v77, 0i64);
if ( (unsigned __int8)KeInsertQueueApc(allocated_pool_2, allocated_pool_2, 0i64, 2i64) )
```
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