alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linux/Tsunami Downloader"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/.x/"; startswith; fast_pattern; bsize:7; content:"sh"; endswith; pcre:"/^\/\.x\/\dsh$/U"; http.user_agent; content:"Wget"; startswith; http.header_names; content:!"Referer"; classtype:trojan-activity; sid:2034683; 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;)