alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan Downloader User-Agent BGroom"; flow:established,to_server; http.header; content:"User-Agent|3A 20|BGroom"; classtype:trojan-activity; sid:2013717; rev:3; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2011_10_01, deployment Perimeter, confidence High, signature_severity Major, tag Trojan_Downloader, updated_at 2020_04_20;)