ET MALWARE WallStealer CnC Checkin - Data Exfiltration

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE WallStealer CnC Checkin - Data Exfiltration";
    flow:established,to_server;
    flowbits:set,ET.WallStealer.Checkin;
    http.method;
    content:"POST";
    http.uri; bsize:11;
    content:"/api/client";
    http.user_agent;
    content:"systeminfo|20|client|2f|"; nocase; startswith;
    http.request_body;
    content:"|7b 22|type|22 3a 22|file_upload|22 2c 22|file_name|22 3a 22|"; fast_pattern; startswith;
    content:"|22 2c 22|file_category|22 3a 22|"; within:100;
    content:"|22 2c 22|data|22 3a 22|"; within:100;
    reference:url,bazaar.abuse.ch/sample/903cdf6c4bef90c7bcdacd909cc7e9c2be528a4de785f0aa2c19c6a1e4166a53/;
    reference:md5,6dac8ea22fcefdb84142c0ffc62ffb18;
    classtype:trojan-activity;
    sid:2065824; 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 TLSDecrypt, created_at 2025_11_19, deployment Perimeter, malware_family WallStealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_19, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system;
    target:src_ip;
)