alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Netwire RAT Check-in 2"; flow:established,to_client; stream_size:server,<,72; dsize:69; content:"|41 00 00 00 85|"; depth:5; flowbits:isset,ET.NetwireRAT.Client; reference:url,www.circl.lu/pub/tr-23/; classtype:trojan-activity; sid:2025036; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_29, deployment Perimeter, malware_family Netwire_RAT, confidence High, signature_severity Major, updated_at 2022_08_10;)