alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/Roboto - Possible Encrypted Roboto P2P Payload Requested M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/roboto."; fast_pattern; pcre:"/^tt[cf]$/R"; http.user_agent; content:!"Windows"; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; reference:url,blog.netlab.360.com/the-awaiting-roboto-botnet-en/; classtype:command-and-control; sid:2029040; rev:3; metadata:affected_product Linux, created_at 2019_11_21, deployment Perimeter, deployment Internal, malware_family Roboto, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_06;)