ET MALWARE MSIL.L4L Stealer Systeminfo Exfiltration

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL.L4L Stealer Systeminfo Exfiltration";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?action=upload&host="; fast_pattern;
    content:"@"; distance:0;
    http.request_body;
    content:"filename=|22|system.info|22|";
    http.header_names;
    content:!"User-Agent";
    content:!"Referer";
    content:!"Accept";
    reference:md5,918ffdba1014ec647ae24ddc9de9fde9;
    classtype:command-and-control;
    sid:2028931; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_31, deployment Perimeter, malware_family MSIL_L4L, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21;
)