alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FatalRAT CnC Activity"; flow:established,to_server; stream_size:server,=,1; content:"|bf bc 95|"; depth:3; content:"|8e 8e|"; distance:2; within:2; content:"|8e 8e 2c 1b 80 8e e6 02|"; distance:2; within:8; fast_pattern; reference:md5,99fc53d3d4c2c31fd5b5f0f15dbdeab4; reference:url,twitter.com/c3rb3ru5d3d53c/status/1400075253695537155; classtype:command-and-control; sid:2033093; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_04, deployment Perimeter, malware_family FatalRAT, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_04;)