alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Midhos/Medfos downloader"; flow:established,to_server; http.uri; content:"/upload/fid="; content:"AAAAAAAAAAA"; http.header; content:"Host|3a 20|megaupload.com|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b| MSIE 6.0"; http.header_names; content:!"Accept|0d 0a|"; content:!"Connection|0d 0a|"; classtype:trojan-activity; sid:2016189; rev:3; metadata:created_at 2013_01_12, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_22;)