alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan-Dropper.Delf Checkin"; flow:established,to_server; http.uri; content:"/autoupdate/versaoatual.txt"; fast_pattern; endswith; http.user_agent; content:"Mozilla/3.0 (compatible|3b 20|Indy Library)"; reference:md5,52765b346c12d55e255a669bb8cfebb8; classtype:command-and-control; sid:2025283; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_02_01, deployment Perimeter, malware_family Dropper, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_11_05;)