alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET MALWARE eCh0raix/QNAPCrypt CnC Activity - Done";
flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php?s=done"; 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:2027702; 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;
)