ET MALWARE [PTsecurity] Win32/Ramnit Stage 0 Communicating with CnC

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE [PTsecurity] Win32/Ramnit Stage 0 Communicating with CnC";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    file.data;
    content:"WAIT|20|"; depth:15;
    content:"CERT|20|"; fast_pattern; within:20;
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/Ri";
    reference:md5,20148e48668cb5e0b22d437ee0443cfe;
    reference:url,research.checkpoint.com/ramnits-network-proxy-servers/;
    classtype:command-and-control;
    sid:2026113; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_09_14, deployment Perimeter, malware_family Ramnit, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_18;
)