alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Expiro.CD Check-in"; flow:established,to_server; http.uri; content:"/gate.php?user="; fast_pattern; content:"&id="; nocase; content:"&type="; pcre:"/\.php\?user=[a-f0-9]{32}&id=\d+&type=\d+(?:$|&)/"; http.header_names; content:!"User-Agent|0d 0a|"; reference:md5,c6e161a948f4474849d5740b2f27964a; classtype:trojan-activity; sid:2018255; rev:4; metadata:created_at 2014_03_12, malware_family Win32_Expiro_CD, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_23;)