alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/DarkVision RAT CnC Checkin M1"; flow:established,to_server; dsize:56; content:"|7b|"; startswith; content:"-4"; distance:13; within:2; content:"|7d 00|"; distance:21; within:2; fast_pattern; content:"|00|"; endswith; pcre:"/^\{[A-F0-9]{8}-(?:[A-F0-9]{4}-){3}[A-F0-9]{12}\}/"; flowbits:set,ET.darkvision_cnc; reference:url,twitter.com/Gi7w0rm/status/1655327430372995075; reference:md5,5bf6dda87c399945bfdae0c390523f6c; classtype:trojan-activity; sid:2045618; 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 Significant, confidence High, signature_severity Major, updated_at 2023_06_09, reviewed_at 2025_07_14; target:src_ip;)