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Panda Software's weekly report on viruses and intruders

- Panda Software's weekly report on viruses and intruders -
Oxygen3 24h-365d, by Panda Software
(http://www.pandasoftware.com)

MADRID, July 3, 2005 - This edition of Panda Software's weekly report
looks at three Trojans, Trj/PGPCoder.B, Trj/Mitglieder.DQ and
Trj/Bancos.GW, and two worms, W32/Oscarbot.AY and W32/Codbot.AP.

Bancos.GW is a Trojan that steals passwords and is programmed to spy on
the browsing activity of the users it affects. If they enter certain
keywords related to online banking portals, which are registered in this
malware's code or visit the websites of certain international banks, it
displays a pop-up message. This pop-up message asks users for
information about their bank accounts, assuring the user that it is part
of the bank's secure SSL protocol. It sends all of the information it
collects to a remote server, which the author of this malware can
access.

The B version of PGPCoder is an update of a malware that "hijacked"
files, encrypted them and held them to ransom, with improved functions,
such as the capacity to encrypt a larger number of files and a different
encryption algorithm. After encrypting the files, it deletes itself and
sends the affected user an email asking the user for an unspecified
amount of money in order to resolve the problem. This malware cannot
spread by itself and therefore, must be distributed manually.

The last Trojan, Mitglieder.DQ, targets certain IT security tools, such
as antivirus programs and firewalls, stopping the associated services
and ending the processes. It also deletes the entries with their
configuration details from the Registry. This Trojan also tries to
download a file called OSA3.GIF, which could be another type of malware,
although these downloads were not available when this article was
written. This Trojan belongs to the Bagle/Mitglieder family. Over the
last few months a large number of variants of this family have appeared,
causing a significant number of incidents.

The two worms in this week's report are bots. This type of malware has
backdoor characteristics and goes resident on the user's computer and
waits to receive commands. Bots can be used to carry out coordinated
attacks or send out spam and are "hired out" by their creators. The
first of these is Oscarbot.AY, a worm that receives commands through an
IRC server, which range from downloading and running code to updating
its code or deleting itself. This worm spreads through the instant
messaging application AOL Instant Messenger (AIM) by sending a message
to all the contacts of the affected user with a link to a copy of the
worm.

Codbot.AP acts in a similar way, but it also checks the computer for the
most common known vulnerabilities and can log the users' keystrokes in
order to steal passwords or other confidential information like bank
account details, credit card numbers, etc. This worm spreads by
exploiting two of the most common known Windows vulnerabilities, LSASS
and RPC-DCOM, making it essential to update the system to resolve these
incidents.

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