alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nyanw0rm CnC Keep-Alive (Outbound) M2"; flow:established,to_server; dsize:16; content:"|49 42 d4 b5 38 70 fe 86 2a 4e d2 73 0d 95 79 e5|"; reference:md5,5c12015ebeb755c0b6029468a13e59a9; classtype:command-and-control; sid:2027813; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_07, deployment Perimeter, confidence High, signature_severity Major, tag Nyanw0rm, updated_at 2019_08_07;)