alert dns $HOME_NET any -> any any (msg:"ET MALWARE Sidewinder APT Related Domain in DNS Lookup"; dns.query; content:"mailcantonfair.cssc.info"; nocase; bsize:24; reference:url,mp.weixin.qq.com/s/qsGxZIiTsuI7o-_XmiHLHg; classtype:domain-c2; sid:2036653; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_05_23, deployment Perimeter, malware_family Sidewinder, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_23;)