alert dns $HOME_NET any -> any any (msg:"ET MALWARE Observed DNS Query to Sainbox Domain"; dns.query; bsize:22; content:"yrmajnbxpt.localto.net"; nocase; reference:md5,f5aea239fa2f9d52d6e2bb43c75533ed; classtype:command-and-control; sid:2069280; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_05_14, deployment Perimeter, malware_family Sainbox, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_14;)