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:"|40 00 00 00|"; dsize:4; reference:md5,43a2f0f6fb1b858e9d7997ba8317df03; reference:url,twitter.com/James_inthe_box/status/1410260077861249028; classtype:command-and-control; sid:2033211; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_30, deployment Perimeter, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_30;)