ET MALWARE SantaStealer Data Exfiltration Attempt

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SantaStealer Data Exfiltration Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:7;
    content:"/upload";
    http.user_agent; bsize:6;
    content:"upload";
    http.header;
    content:"auth|3a 20|";
    pcre:"/^[a-f0-9]{64}/R";
    content:"complete|3a 20|true"; fast_pattern;
    http.header_names;
    content:"|0d 0a|auth|0d 0a|";
    content:"|0d 0a|w|0d 0a|";
    content:"|0d 0a|complete|0d 0a|";
    content:!"|0d 0a|referer|0d 0a|";
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|";
    pcre:"/^[A-F0-9]{8}\x2d(?:[A-F0-9]{4}\x2d){3}[A-F0-9]{6}\x2ezip\x2e/R";
    reference:url,www.rapid7.com/blog/post/tr-santastealer-is-coming-to-town-a-new-ambitious-infostealer-advertised-on-underground-forums/;
    classtype:trojan-activity;
    sid:2066336; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_12_16, deployment Perimeter, malware_family Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_12_16, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)