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; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,github.com/SECFORCE/Tunna; classtype:trojan-activity; sid:2028574; rev:3; 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 2024_04_21;)