alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linux/Tsunami Remote Shell M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/var/"; startswith; content:"pty"; fast_pattern; endswith; bsize:11; pcre:"/^\/var\/(?:run|tmp)\/pty$/U"; http.user_agent; content:"Wget"; startswith; content:!"Referer"; classtype:trojan-activity; sid:2034686; rev:3; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)