ET HUNTING Outbound POST Request with Zipped Directory Traversal Filename

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET HUNTING Outbound POST Request with Zipped Directory Traversal Filename";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"PK"; startswith;
    content:"../"; distance:20; within:500; fast_pattern;
    classtype:misc-activity;
    sid:2038503; rev:2;
    metadata:created_at 2022_08_12, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_26, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1083, mitre_technique_name File_And_Directory_Discovery;
    target:dest_ip;
)