ET MALWARE Win32/ObserverStealer Sending Browser Related Information (Google)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/ObserverStealer Sending Browser Related Information (Google)";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"POST";
    http.user_agent;
    content:"HTTP/1.1"; bsize:8; fast_pattern;
    http.header;
    content:"|3a 20|Google_";
    http.header_names;
    content:!"Referer";
    reference:md5,4a650883227d0f88b5e6b7c48a456939;
    classtype:trojan-activity;
    sid:2051450; 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 2024_03_04, deployment Perimeter, malware_family ObserverStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_04, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)