alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET [!2038,!3478,!5000,!22466,!3101,!6180,!80,!443,!8080,!8443,!25,!587,!2525] (msg:"ET MALWARE QuasarRAT/zgRAT C2 Activity (set)"; flow:established,to_server; flowbits:set,ET.zgRAT; flowbits:noalert; content:"|19 00 00 00|"; dsize:4; reference:md5,4e893ea0874f70f4972fa93fed96e77c; classtype:command-and-control; sid:2033107; rev:10; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_10, deployment Perimeter, malware_family Quasar, malware_family VoidRat, malware_family zgRAT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_10;)