alert http $HOME_NET any -> any any (msg:"ET MALWARE Suspected Tunna Proxy M4 (Outbound)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"?proxy&close"; endswith; fast_pattern; http.accept_enc; content:"gzip"; startswith; endswith; http.header_names; content:!"Referer"; reference:url,github.com/SECFORCE/Tunna; classtype:trojan-activity; sid:2028581; rev:2; metadata:created_at 2019_09_13, deployment Perimeter, malware_family Tunna, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_02;)