alert tcp-pkt $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE MargulasRAT Keep-Alive Inbound M1"; flow:established,to_client; content:"|31 36 00 da 1b 70 b5 96 ed a6 4a 18 8e ce 90 cc 5a fc 71|"; reference:md5,66fb288e71fa3fbcd2b49d292f1938f6; reference:url,blog.talosintelligence.com/2021/07/sidecopy.html; classtype:command-and-control; sid:2033334; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_15, deployment Perimeter, malware_family MargulasRAT, confidence High, signature_severity Major, tag RAT, updated_at 2021_07_15;)