alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET MALWARE Webshell Upload Command Inbound - Possibly Iran-based"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".aspx?operation=upload"; fast_pattern; http.request_body; content:"name=|22|authKey|22|"; content:"name=|22|file|22|"; distance:0; classtype:command-and-control; sid:2033417; rev:1; metadata:attack_target Server, created_at 2021_07_25, deployment Perimeter, confidence High, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_25, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component;)