alert dns $HOME_NET any -> any any (msg:"ET MALWARE Sidewinder CnC DNS Query"; dns.query; content:"cdn-load.net"; nocase; endswith; reference:url,s.tencent.com/research/report/659.html; classtype:command-and-control; sid:2027056; rev:3; metadata:attack_target Client_and_Server, created_at 2019_03_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag APT, tag Sidewinder, updated_at 2020_09_16;)