alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Avatar RootKit Yahoo Group Search"; flow:to_server,established; http.uri; content:"/search?query="; depth:14; content:"&sort=relevance"; within:15; pcre:"/^[A-Z0-9]{8}/R"; http.host; content:"groups.yahoo.com"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,7b6409fc32c70908a9468eaac845bdaa; reference:md5,b647a4af77b2fad3f40c6769c22ebf74; reference:url,www.welivesecurity.com/2013/08/20/avatar-rootkit-the-continuing-saga/; classtype:trojan-activity; sid:2017368; rev:4; metadata:created_at 2013_08_22, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_28;)