alert dns $HOME_NET any -> any any (msg:"ET MALWARE Kimsuky CnC Domain in DNS Lookup"; dns.query; bsize:16; content:"ygbsbl.hopto.org"; nocase; reference:url,aryaka.com/blog/kimsuky-apt-stealth-malware-social-engineering; classtype:command-and-control; sid:2063839; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_06_24, deployment Perimeter, malware_family Kimsuky, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_31, former_sid 2863021;)