alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Socks5 Proxy to Onion (set)"; flow:established,to_server; flowbits:set,ET.Socks5.OnionReq; content:"|05 01 00 03|"; depth:4; content:".onion|00 50|"; distance:0; fast_pattern; reference:url,www.intezer.com/blog-seizing-15-active-ransomware-campaigns-targeting-linux-file-storage-servers; classtype:policy-violation; sid:2027703; rev:1; metadata:attack_target Client_Endpoint, created_at 2019_07_11, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2019_07_26;)