""ET POLICY Outbound SMTP NTLM Authentication Observed""
SID: 2027152
Revision: 2
Class Type: policy-violation
Metadata: attack_target Client_and_Server, created_at 2019_04_04, deployment Perimeter, performance_impact Low, signature_severity Minor, updated_at 2019_04_04
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: [25,587]
Flow: established,to_server
Contents:
- Value: "AUTH|20|ntlm|20|" Depth: 10
Within:
PCRE: "/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})$/Ri"
Special Options:
-
nocase
-
fast_pattern