alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Enfal CnC POST"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".cgi"; fast_pattern; endswith; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; content:!"Content-Type|0d 0a|"; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|"; pcre:"/^(?:Cache-Control|Pragma)\x0d\x0a\x0d\x0a$/R"; reference:md5,f1b341d3383b808ecfacfa22dcbe9196; classtype:command-and-control; sid:2021079; rev:8; metadata:created_at 2015_05_09, performance_impact Significant, signature_severity Major, updated_at 2024_04_07;)