alert tcp [$HOME_NET,$HTTP_SERVERS] any -> $EXTERNAL_NET any (msg:"ET INFO Onion/TOR Proxy Client Request"; flow:established,to_server; flowbits:set,ET.zhtrap1; content:"|05 01 00|"; startswith; content:".onion"; distance:0; fast_pattern; isdataat:!3,relative; reference:url,blog.netlab.360.com/new_threat_zhtrap_botnet_en/; classtype:bad-unknown; sid:2032083; rev:3; metadata:attack_target Client_and_Server, created_at 2021_03_16, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14; target:src_ip;)