Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET PHISHING Fake IRS Scam Domain (ustaxnumber .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".ustaxnumber.com"; endswith; fast_pattern; reference:url,www.malwarebytes.com/blog/uncategorized/2024/03/tax-scammer-goes-after-small-business-owners-and-self-employed-people; classtype:trojan-activity; sid:2051757; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_03_20, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)