alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Datamaikon Checkin myAgent"; flow:to_server,established; http.uri; content:"/index.dat?"; pcre:"/^\d{5,9}$/R"; http.header; content:"|20|myAgent|0d 0a|Host|3a 20|"; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanDownloader%3AWin32%2FDatamaikon.gen!A&ThreatID=-2147312276; reference:md5,a51933ee0f2ade7df98feb7207a2ffaf; classtype:command-and-control; sid:2014468; rev:4; metadata:created_at 2012_04_04, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_21;)