一般这类病毒体大小在几百字节到几KB之间，比一般的木马程序要小的多，便于网络传播。网站挂马通常挂的都是下载者木马，因为下载者程序体积小，可以迅速下载执行，不卡IE浏览器。所以，不安装杀毒软件，一般很难发现-Usually this type of virus in body size between a few hundred bytes to a few KB, Trojans than the average much smaller, easy network transmission. Usually linked sites are linked to the horse downloader Trojan downloader program because of small size, can be quickly downloaded and run, no card IE browser. So, do not install anti-virus software, is generally difficult to find