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利用进程空闲为壳软件打补丁3例

一、利用Sleep延迟进程启动
.586
.model flat, stdcall  
option casemap :none  
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
include windows.inc
include kernel32.inc
include user32.inc
include macros.inc

includelib kernel32.lib
includelib user32.lib

.data
FileName    db crackme.exe,0
NewBytes    db 74h                            ;写入的新字节
OldBytes    db 75h                            ;原来的字节

.data?
startinfo     STARTUPINFO <> 
pi            PROCESS_INFORMATION <> 
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
.code
start:
     invoke GetStartupInfo,addr startinfo     
     invoke CreateProcess,addr FileName,NULL,NULL,NULL,FALSE,CREATE_NEW_PROCESS_GROUP,NULL,NULL,addr startinfo,addr pi  
            .if eax == 0
                invoke MessageBox,NULL,CTXT("请置于程序目录"),CTXT("错误!"),MB_OK               
            .endif
     invoke Sleep,500                                                                                  ;延迟 500 毫秒等待壳的解压
     invoke SuspendThread,pi.hProcess                                                                  ;然后迅速挂起
     invoke WriteProcessMemory,pi.hProcess,004010F9h,addr NewBytes,sizeof NewBytes,addr OldBytes       ;写入字节
     invoke ResumeThread,pi.hProcess                                                                   ;恢复线程
end start            


二、利用WaitForInputIdle等待系统空闲
.code
start:
    invoke GetModuleHandle,NULL
    mov hInstance,eax
    invoke CreateProcess,addr FileName ,NULL,NULL,NULL,FALSE,NORMAL_PRIORITY_CLASS,NULL,NULL, addr startinfo,addr pi
    cmp eax,0                                                                                 
    jz eror_1
    invoke WaitForInputIdle,pi.hProcess,INFINITE          ;等候进程进入空闲状态
    invoke WriteProcessMemory,pi.hProcess,004010F9h,CTXT(74h),1,NULL
    cmp eax,0                                                                                 
    jz eror_2
    fin:
    invoke <
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