ET MALWARE Win32/saolei CnC Host Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/saolei CnC Host Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"|2f|shell|2f 3f|par|3d|"; startswith; fast_pattern;
    content:"&val="; distance:0;
    content:"LS0"; distance:0;
    http.header_names;
    content:!"|0d 0a|User-Agent|0d 0a|"; nocase;
    content:!"|0d 0a|Referer|0d 0a|"; nocase;
    reference:md5,c8e6cd1fb6f5dfe1ab548024a7f67043;
    classtype:trojan-activity;
    sid:2054616; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_07_19, deployment Perimeter, malware_family Win32_saolei, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)