alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TDSS/TDL/Alureon MBR rootkit Checkin"; flow:established,to_server; urilen:16<>402; http.method; content:"GET"; nocase; http.uri; pcre:"/^\/[a-z0-9+\/=]{16,400}$/i"; http.user_agent; content:"Mozilla/4.0|20 28|compatible|3b 20|MSIE"; fast_pattern; http.header_names; content:"|0d 0a|Accept-Language|0d 0a|"; depth:19; content:"Host|0d 0a|"; distance:0; content:!"Accept"; classtype:command-and-control; sid:2011894; rev:21; metadata:created_at 2010_11_06, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_09;)