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;)