alert udp $HOME_NET any -> $EXTERNAL_NET 53 (msg:"ET HUNTING Large non-DNS Packet on Port 53"; dsize:>500; content:!"|00 01 00 00 00 00 00|"; depth:20; threshold:type limit,count 1,seconds 300,track by_src; reference:url,resecurity.com/es/blog/article/pdfsider-malware-exploitation-of-dll-side-loading-for-av-and-edr-evasion; classtype:misc-activity; sid:2067113; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_01_26, deployment Perimeter, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_26; target:src_ip;)