alert http [$HOME_NET,$HTTP_SERVERS] any -> any any (msg:"ET MALWARE Webshell Landing Outbound - Possibly Iran-based"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"<title>filesystembrowser<|2f|title>"; content:"action=|22|?operation=upload|22|"; distance:0; fast_pattern; content:"<br>Auth|20|Key|3a|"; distance:0; within:100; classtype:command-and-control; sid:2033416; 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;)