ET PHISHING Ferest Smuggler Request M1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET PHISHING Ferest Smuggler Request M1";
    flow:established,to_server;
    http.uri;
    content:"/?";
    content:"="; distance:32; within:1;
    content:"&"; distance:64; within:1;
    content:"&username="; fast_pattern; distance:64; within:10;
    content:"&"; distance:0;
    isdataat:!33,relative;
    pcre:"/\/\?(?P<variable>[a-zA-Z0-9]{32})=(?P=variable){2}\&(?P=variable){2}&username=(?:[A-Za-z0-9+\/]{4})*(?:[A-Za-z0-9+\/]{4}|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{2}={2})\&(?P=variable)$/";
    reference:url,medium.com/@thrunter/cyberuptive-identifies-and-disrupts-ferest-smuggler-a-mass-credential-harvesting-campaign-22875c563854;
    classtype:credential-theft;
    sid:2047705; rev:1;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2023_08_23, deployment Perimeter, deployment SSLDecrypt, malware_family Ferest_Smuggler, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_23, reviewed_at 2023_08_23;
    target:src_ip;
)