alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Vibem.C CnC Activity"; flow:established,to_server; content:"|63 76 c4 52 99 1d 04 80 a9 1b 2d|"; depth:11; content:!"|00|"; reference:md5,bef6faabe3d80037c18fa7b806f4488e; classtype:command-and-control; sid:2025581; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_05_18, deployment Perimeter, malware_family Win32_Vibem_C, confidence High, signature_severity Major, updated_at 2019_07_26;)