alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Downloader User-Agent HTTPGET"; flow:established,to_server; http.user_agent; content:"HTTPGET"; depth:7; http.host; content:!"autodesk.com"; endswith; content:!"rsa.com"; endswith; content:!"consumersentinel.gov"; endswith; content:!"technet.microsoft.com"; endswith; content:!"metropolis.com"; endswith; content:!"www.catalog.update.microsoft.com"; endswith; classtype:trojan-activity; sid:2013508; rev:14; metadata:created_at 2011_08_31, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;)