alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Fosniw CnC Checkin Style 2"; flow:established,to_server; http.uri; content:".asp?prj="; content:"&pid="; content:"&mac="; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanDownloader%3AWin32%2FFosniw.B; classtype:command-and-control; sid:2013203; rev:3; metadata:created_at 2011_07_06, malware_family Win32_Fosniw, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_20;)