alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Sinresby.B Downloader CnC Activity M2"; flow:established,to_server; content:"|00 00 00 7b 22 63 67 69 22 3a 31|"; offset:1; depth:11; content:"|22|data|22 3a 7b 22|mac|22 3a 22|"; distance:0; fast_pattern; content:"|22 2c 22|pc|22 3a 22|"; distance:0; reference:md5,8049009d9675d5ac345ce96d1a7c9e67; classtype:command-and-control; sid:2033793; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_08_25, deployment Perimeter, malware_family Win32_Sinresby_B, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_25;)