alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bedep HTTP POST CnC Beacon 2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?"; fast_pattern; pcre:"/\.php(?:\?[a-zA-Z0-9=&]+)?$/"; http.header; pcre:"/^(?:Connection\x3a[^\r\n]+\r\n)?(?:Content-Type\x3a[^\r\n]+\r\n)?Accept\x3a[^\r\n]+\r\n(?:Accept-Encoding\x3a[^\r\n]+\r\n)?Accept-Language\x3a[^\r\n]+\r\n(?:Referer\x3a[^\r\n]+\.php[^\r\n]*?\r\n)?User-Agent\x3a[^\r\n]+(?: MSIE |rv\x3a11)/i"; http.cookie; content:"PHPSESSID="; pcre:"/(?:[a-z]+=\d{3,4}\x3b\x20){4}/"; http.request_body; pcre:"/^[a-z]+\d*=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})(?:&[a-z]+\d*=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})){2,}$/"; http.accept; content:"text/html, application/xhtml+xml, */*"; bsize:37; classtype:command-and-control; sid:2021718; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_08_26, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)