ET MALWARE MSIL/Alcatrez Locker Ransomware CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Alcatrez Locker Ransomware CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?user="; fast_pattern;
    content:"&try="; distance:0;
    content:"&status="; distance:0;
    http.header_names;
    content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; startswith;
    http.connection;
    content:"Keep-Alive"; bsize:10; nocase;
    reference:md5,1cb51c130e6f75f11c095b122e008bbc;
    classtype:command-and-control;
    sid:2023506; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_14, deployment Perimeter, malware_family Ransomware, malware_family Alcatrez_Locker, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)