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Rule:
--
Sid:
100000110
--
Summary:
This event is generated when the Dabber virus attempts to exploit a
vulnerability in the FTP server installed by the Sasser virus.
--
Impact:
If the Sasser virus is currently running on the affected system, then the
Dabber virus will be able to install itself as well.
--
Detailed Information:
Some variants of the Sasser virus install an FTP server that listens on port
5554. However, this FTP server suffers from a buffer overflow in the PORT
command, which can be exploited with a command of 100 or more characters. The
Dabber virus makes use of this vulnerability as an infection vetor.
--
Affected Systems:
Any machine with a variant of the Sasser virus whose FTP server listens on port
5554.
--
Attack Scenarios:
A known virus scans the Internet in search of vulnerable systems.
--
Ease of Attack:
Simple, as the virus is in the wild.
--
False Positives:
None Known.
--
False Negatives:
None Known.
--
Corrective Action:
Users should employ a virus removal tool to clean their system of both Dabber
and Sasser, and then apply the latest security patches from Microsoft to
prevent further infections.
--
Contributors:
Matt Watchinski <mwatchinski@sourcefire.com>
Alex Kirk <alex.kirk@sourcefire.com>
--
Additional References:
http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx
--
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