Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Observed NSO Group CnC Domain in TLS SNI (stilloak .net)"; flow:established,to_server; tls.sni; content:"stilloak.net"; bsize:12; fast_pattern; reference:url,citizenlab.ca/2020/12/the-great-ipwn-journalists-hacked-with-suspected-nso-group-imessage-zero-click-exploit; classtype:domain-c2; sid:2031443; rev:1; metadata:attack_target Mobile_Client, created_at 2020_12_21, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_21;)