alert http any any -> $HOME_NET any (msg:"ET MALWARE Suspected Tunna Proxy M3"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"?proxy&port="; fast_pattern; http.accept_enc; content:"gzip"; startswith; endswith; http.header_names; content:!"Referer"; reference:url,github.com/SECFORCE/Tunna; classtype:trojan-activity; sid:2028574; rev:2; metadata:created_at 2019_09_12, deployment Perimeter, malware_family Tunna, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_02;)