alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 65535 (msg:"ET MALWARE DarkWay Client Checkin"; flow:established,to_server; content:"|1f 8b 08 00 00 00 00 00 04 00|"; startswith; fast_pattern; content:"|00 00|"; endswith; reference:md5,afe88d8042a796816c8a7251a6e2fddc; reference:md5,bf95d7062c1c7df67ce9fff64a213cf2; reference:url,twitter.com/_jsoo_/status/1423975922164633601; classtype:command-and-control; sid:2033737; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_17, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2021_08_17;)