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SID: 2069281 • Source: et/open

Versions (2)

Version DetailsCurrent

Rev: 1May 14, 2026, 12:00 PM

ET MALWARE Observed Sainbox Domain in TLS SNI

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Sainbox Domain in TLS SNI"; flow:established,to_server; tls.sni; bsize:22; content:"yrmajnbxpt.localto.net"; fast_pattern; classtype:command-and-control; sid:2069281; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_05_14, deployment Perimeter, malware_family Sainbox, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_05_14;)

May 14, 2026, 12:00 PM

May 14, 2026, 12:00 PM

May 14, 2026, 10:34 PM

May 15, 2026, 8:34 PM

rules/emerging-malware.rules