alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Tunna Variant Webshell Activity"; flow:established,to_client; http.response_body; content:"Tunna v1.1g"; fast_pattern; startswith; reference:md5,c21eefc65cda49f17ddd1d243a7bffb5; reference:url,research.checkpoint.com/2023/from-albania-to-the-middle-east-the-scarred-manticore-is-listening/; classtype:trojan-activity; sid:2049010; rev:2; metadata:attack_target Server, created_at 2023_11_01, deployment Perimeter, confidence High, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_03, reviewed_at 2023_11_01, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component; target:src_ip;)