alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/Chacha.DDoS/Xor.DDoS Stage 2 CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"LuaSocket|20|"; depth:10; fast_pattern; http.request_body; content:"macaddress="; depth:11; content:"&device="; distance:0; content:"&type="; distance:0; content:"&version="; distance:0; http.connection; content:"close,|20|TE"; depth:9; http.header_names; content:"TE|0d 0a 0d 0a|"; content:!"Referer"; reference:url,www.welivesecurity.com/2018/10/18/new-linux-chachaddos-malware-distributed-servers-vestacp-installed/; classtype:command-and-control; sid:2026523; rev:2; metadata:affected_product Linux, created_at 2018_10_18, deployment Perimeter, malware_family ChaChaDDoS, malware_family XorDDoS, performance_impact Low, confidence High, signature_severity Major, tag DDoS, updated_at 2020_08_26;)