alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Enfal CnC GET"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"docs/"; fast_pattern; pcre:"/^\/(?:tran|http)docs\//"; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|Host|0d 0a|"; startswith; pcre:"/^(?:Cache-Control|Pragma)\x0d\x0a\x0d\x0a$/R"; reference:md5,f1b341d3383b808ecfacfa22dcbe9196; classtype:command-and-control; sid:2021080; rev:7; metadata:created_at 2015_05_09, performance_impact Significant, signature_severity Major, updated_at 2024_04_07;)