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Internet Security Systems Security Brief
December 26, 2002

Dynamic Trojan Horse Network Hybrid Threat Propagation

Synopsis:

ISS X-Force has been monitoring the spread of the Dynamic Trojan Horse
Network (DTHN) Internet worm. DTHN propagates through email and
through open NetBIOS file shares. DTHN installs itself and establishes
communication to a sophisticated peer-to-peer communications network,
to further spread infections and launch additional attacks.

Impact:

As with most network worms, DTHN propagation can cause network
congestion, automatically compromise victim systems, and configure a
sophisticated network that can be used for Distributed Denial of
Service (DDOS). Once the backdoor is installed, it can be accessed
by the author, or third party attackers.

For the complete ISS X-Force Security Alert, please visit:

http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=21693

______

About Internet Security Systems (ISS) Founded in 1994, Internet Security
Systems (ISS) (NASDAQ: ISSX) is a pioneer and world leader in software
and services that protect critical online resources from an ever-
changing spectrum of threats and misuse. Internet Security Systems is
headquartered in Atlanta, GA, with additional operations throughout the
Americas, Asia, Australia, Europe and the Middle East.

Copyright (c) 2002 Internet Security Systems, Inc. All rights reserved
worldwide.

Permission is hereby granted for the electronic redistribution of this
document. It is not to be edited or altered in any way without the
express written consent of the Internet Security Systems X-Force. If you
wish to reprint the whole or any part of this document in any other
medium excluding electronic media, please email xforceiss.net for
permission.

Disclaimer: The information within this paper may change without notice.
Use of this information constitutes acceptance for use in an AS IS
condition. There are NO warranties, implied or otherwise, with regard to
this information or its use. Any use of this information is at the
user's risk. In no event shall the author/distributor (Internet Security
Systems X-Force) be held liable for any damages whatsoever arising out
of or in connection with the use or spread of this information.

X-Force PGP Key available on MIT's PGP key server and PGP.com's key
server, as well as at <http://www.iss.net/security_center/sensitive.php>
Please send suggestions, updates, and comments to: X-Force
xforceiss.net of Internet Security Systems, Inc.

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