GEN:SID 1:631
Message SMTP ehlo cybercop attempt
Summary This event is generated when an external user scans an internal SMTP
server using Network Associates' Cybercop vulnerability scanner.
Impact Information gathering.
Detailed Information Cybercop Scanner is scanning software that searches for system
vulnerabilities. As one of its scanning procedures, it sends an EHLO
command to SMTP server ports to determine if the SMTP server will return
a list of remote commands that it accepts.  
Affected Systems Any SMTP server that returns a list of acceptable commands for remote mailers.
Attack Scenarios An attacker may run Cybercop Scanner against SMTP servers in order to
determine vulnerabilities that can later be exploited.
Ease of Attack Simple.
Corrective Action Ensure that your SMTP server does not provide more information than is
necessary when it receives an EHLO request.
Additional References General Cybercop information:
http://www.securityfocus.com/products/126
Rule References arachnids: 372