alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Rostpay Downloader User-Agent"; flow:established,to_server; http.user_agent; content:"Rostpay Downloader"; nocase; depth:18; endswith; reference:md5,6887e8e2fb391a1ca84f192efd5c8331; classtype:trojan-activity; sid:2025697; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_07_16, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;)