alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/AdAptertrAin CnC Server Checkin"; flow:established,to_server; dsize:<100; content:"|28|XXX|29|"; fast_pattern; pcre:"/(?:\x28XXX\x29(?:[0-9]{5,8})\x28XXX\x29(?:[0-9]{1,3}))$/"; reference:md5,204f66cb1239e818b3da66467fb8c56e; reference:url,twitter.com/naumovax/status/1747985922098966617; classtype:trojan-activity; sid:2050230; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_01_18, deployment Perimeter, malware_family Win32_AdAptertrAin, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_18;)