ET MALWARE slock Ransomware CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE slock Ransomware CnC Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/slock.php?ip="; fast_pattern;
    content:"&&user="; distance:0;
    content:"&&host="; distance:0;
    content:"&&domain="; distance:0;
    http.user_agent;
    content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|WOW64|3b 20|Trident|2f|7|2e|0|3b 20|rv|3a|11|2e|0|29 20|like|20|Gecko"; bsize:69;
    reference:md5,45a430e2bcba867f4d8a537354a98a73;
    classtype:command-and-control;
    sid:2034291; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_29, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_29, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)