ET MALWARE AlphaCrypt CnC Beacon 3

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE AlphaCrypt CnC Beacon 3";
    flow:established,to_server;
    urilen:>250;
    http.method;
    content:"GET";
    http.uri;
    content:"/r.php?"; fast_pattern;
    pcre:"/\/r\.php\?[A-F0-9]+=?$/";
    http.header_names;
    content:!"|0d 0a|Accept";
    content:!"|0d 0a|Referer|0d 0a|";
    content:"|0d 0a|User-Agent|0d 0a|"; startswith;
    reference:md5,0a4d0e5d0b69560414bbd20127bd8176;
    classtype:command-and-control;
    sid:2021723; rev:7;
    metadata:attack_target Client_Endpoint, created_at 2015_08_27, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_03_11, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)