ET MALWARE Suspected Lockscreen Ransomware Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Suspected Lockscreen Ransomware Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.referer;
    content:"/?page_id=93"; endswith; fast_pattern;
    http.request_body;
    content:"&page_title=Windows Security Warning&"; within:100;
    reference:url,www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/lockscreen-ransomware-phishing-leads-to-google-play-card-scam/;
    classtype:trojan-activity;
    sid:2030665; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_08_07, deployment Perimeter, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_07, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)