GEN:SID 1:2169
Message VIRUS OUTBOUND .dll file attachment
Summary This event is generated when a possible outgoing virus is detected.
Impact Informational event. An virus on an infected host may be attempting to
propogate.
Detailed Information This event indicates that an outgoing email message possibly containing
a virus has been detected.

This rule generates an event when a filename extension commonly used by
viruses is detected.
Affected Systems Any host.
Attack Scenarios This is indicative of a virus infection.
Ease of Attack Simple.
Corrective Action Check the host for signs of virus infection.
Additional References