alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE eCh0raix/QNAPCrypt CnC Activity - Started"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?s=started"; endswith; fast_pattern; http.user_agent; content:"Go-http-client/1.1"; http.accept_enc; content:"gzip"; depth:4; endswith; http.header_names; content:"|0d 0a|Host|0d 0a|User-Agent|0d 0a|Accept-Encoding|0d 0a 0d 0a|"; reference:url,www.intezer.com/blog-seizing-15-active-ransomware-campaigns-targeting-linux-file-storage-servers; classtype:command-and-control; sid:2027701; rev:4; metadata:attack_target IoT, created_at 2019_07_11, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17;)