alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Datamaikon Checkin"; flow:established,to_server; http.uri; content:"/index.dat?"; pcre:"/\/index.dat\?\d{5,9}$/"; http.user_agent; bsize:41; content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|MSIE|20|6|2e|0|3b 20|Win32|29|"; fast_pattern; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; classtype:command-and-control; sid:2014466; rev:7; metadata:created_at 2012_04_04, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08;)