alert http any any -> $HOME_NET any (msg:"ET MALWARE Papercut MF/NG User/Group Sync FTP Backdoor trigger"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/app"; http.cookie; content:"JSESSIONID|3d|"; startswith; http.request_body; content:"Form0|3d|"; startswith; content:"inputUsername"; content:"inputPassword"; fast_pattern; content:"|3d 21|"; reference:url,vulncheck.com/blog/papercut-rce; classtype:trojan-activity; sid:2045612; rev:1; metadata:affected_product HTTP_Server, attack_target Web_Server, created_at 2023_05_05, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Papercut_MF_NG, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_05; target:dest_ip;)