alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 8880 (msg:"ET MALWARE Win32/Sabsik.TE.B!ml CnC Checkin"; flow:established,to_server; stream_size:server,<,5; content:"|7c|ICARUS|5f|Client|5f 20 7c 20|"; offset:28; depth:18; fast_pattern; content:"|7c|"; distance:0; content:"|7c|"; distance:2; within:1; reference:md5,9aee6276142d333066c590cbe8647f1a; classtype:command-and-control; sid:2037836; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_27, deployment Perimeter, malware_family Win32_Sabsik_TE_B_ml, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_27;)