1.查壳

2.find OEP

3.dump

4.fix

die查壳：

x32dbg调试脱壳,找OEP：

入口点：

mov eax,idaprohelper.44B51C
push eax
push dword ptr fs:[0]
mov dword ptr fs:[0],esp
xor eax,eax
mov dword ptr ds:[eax],ecx

seh异常处理函数

设置忽略异常

异常处理函数下断，运行

SEH异常相关结构

EXCEPTION_DISPOSITION __cdecl _except_handler(
        _In_ struct _EXCEPTION_RECORD* _ExceptionRecord,
        _In_ void*                     _EstablisherFrame,
        _Inout_ struct _CONTEXT*       _ContextRecord,
        _Inout_ void*                  _DispatcherContext
        );

typedef struct _EXCEPTION_RECORD {
    DWORD    ExceptionCode;//+0
    DWORD ExceptionFlags;//+4
    struct _EXCEPTION_RECORD *ExceptionRecord;//+8
    PVOID ExceptionAddress;//+c
    DWORD NumberParameters;
    ULONG_PTR ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
} EXCEPTION_RECORD;

// Exception disposition return values
typedef enum _EXCEPTION_DISPOSITION
{
    ExceptionContinueExecution,
    ExceptionContinueSearch,
    ExceptionNestedException,
    ExceptionCollidedUnwind
} EXCEPTION_DISPOSITION;

mov eax,0xF044A2A1
lea ecx,dword ptr ds:[eax+0x1000129E]
mov dword ptr ds:[ecx+0x1],eax
mov edx,dword ptr ss:[esp+0x4]                     //_ExceptionRecord
mov edx,dword ptr ds:[edx+0xC]                     //ExceptionAddress
mov byte ptr ds:[edx],0xE9                         //0xe9jmp
add edx,0x5                                           //jmp xxxx指令长度 
sub ecx,edx                 //与jmp跳转目标地址的相对偏移（去除当前指令长度）
mov dword ptr ds:[edx-0x4],ecx        //构造jmp指令的目标地址
xor eax,eax                               // ExceptionContinueExecution
ret