Versions (3)
Version DetailsCurrent
Rev: 1 • Apr 4, 2019, 12:00 PMET POLICY Outbound SMTP NTLM Authentication Observed
alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Outbound SMTP NTLM Authentication Observed"; flow:established,to_server; content:"AUTH|20|ntlm|20|"; depth:10; nocase; fast_pattern; pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri"; classtype:policy-violation; sid:2027152; rev:1; metadata:attack_target Client_and_Server, created_at 2019_04_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, updated_at 2019_07_26;)
Apr 4, 2019, 12:00 PM
Jul 26, 2019, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-policy.rules