alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Virut Counter/Check-in"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".asp?mac="; nocase; content:"&ver="; distance:0; nocase; pcre:"/\.asp\?mac=(?:[0-9A-F]{2}-){5}(?:[0-9A-F]{2})+&ver=\d/i"; reference:url,www.threatexpert.com/reports.aspx?find=ipk8888.cn&x=0&y=0; classtype:trojan-activity; sid:2009374; rev:11; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2020_04_22;)