alert http any any -> $HOME_NET any (msg:"ET RETIRED Papercut MF/NG User/Group Sync Python Backdoor Trigger"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/app"; http.cookie; content:"JSESSIONID|3d|"; startswith; http.request_body; content:"service|3d|"; startswith; content:"inputUsername"; content:"inputPassword"; fast_pattern; content:"|3d|import"; reference:url,vulncheck.com/blog/papercut-rce; classtype:trojan-activity; sid:2045611; rev:2; metadata:affected_product HTTP_Server, attack_target Web_Server, created_at 2023_05_05, deployment Perimeter, deployment Internal, deployment SSLDecrypt, former_category MALWARE, confidence High, signature_severity Major, tag Papercut_MF_NG, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_10_01, reviewed_at 2024_10_01; target:dest_ip;)