alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Nyanw0rm CnC Keep-Alive (Outbound) M1"; flow:established,to_server; dsize:16; content:"|73 08 e2 bc 6d 8c 9d b5 85 52 b1 e1 5d 5a 9a 8e|"; reference:md5,d6db3ac5a8022184f03a34fbfdcb926d; classtype:command-and-control; sid:2027812; 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;)