alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan Downloader GetBooks UA"; flow:established,to_server; http.user_agent; content:"GetBooks"; nocase; fast_pattern; classtype:trojan-activity; sid:2015756; rev:11; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2012_10_03, deployment Perimeter, signature_severity Major, tag Trojan_Downloader, updated_at 2020_09_25;)