alert http $EXTERNAL_NET any -> any any (msg:"ET MALWARE AntSword Webshell User-Agent Observed"; flow:established,to_server; http.user_agent; content:"antSword/v"; fast_pattern; startswith; reference:url,github.com/AntSwordProject/antSword; classtype:web-application-attack; sid:2030035; rev:3; metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_28, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_10;)