alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Delf.UUW CnC Keep-Alive"; flow:established,to_server; dsize:8; content:"|65 00 00 00 00 00 00 00|"; threshold:type limit, track by_src, seconds 120, count 1; reference:md5,3ffa6941fc71c2919ccf3edc4992ec99; classtype:trojan-activity; sid:2039719; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_11_04, deployment Perimeter, malware_family Win32_Delf_UUW, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_04;)