alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/DarkVision RAT CnC Checkin M3"; flow:established,to_server; dsize:4; content:"|18 03 00 00|"; flowbits:isset,ET.darkvision_cnc; reference:url,twitter.com/Gi7w0rm/status/1655327430372995075; reference:md5,5bf6dda87c399945bfdae0c390523f6c; classtype:trojan-activity; sid:2045619; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_08, deployment Perimeter, malware_family DarkVision_RAT, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_06_09, reviewed_at 2025_07_14; target:src_ip;)