alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Winshow User Agent"; flow:established,to_server; http.header; content:"User-Agent|3A 20|WinShow Installer"; classtype:trojan-activity; sid:2013401; rev:3; metadata:created_at 2011_08_11, malware_family Win32_Winshow, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_20;)