alert tcp-pkt $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE MargulasRAT Keep-Alive Inbound M2"; flow:established,to_client; content:"|31 36 00 29 73 c4 34 06 b6 62 c3 2e d4 0f 86 fb f3 35 c0|"; reference:md5,5d54adefcf435c4e9f1705df690386c7; reference:url,blog.talosintelligence.com/2021/07/sidecopy.html; classtype:command-and-control; sid:2033337; 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, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2021_07_15;)