alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Monkif Downloader Checkin"; flow:to_server,established; content:"/cgi/"; http_uri; content:".php?"; nocase; http_uri; content:"x640<x"; http_uri; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanDownloader%3aWin32%2fMonkif.C; classtype:command-and-control; sid:2009126; rev:8; metadata:created_at 2010_07_30, malware_family Win32_Monkif, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)