Date: 05 December 2008
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A U S C E R T A L E R T
AL-2008.0117 -- AUSCERT ALERT
[Win]
SPAM email with potentially malicious fake "antivirus" link
5 December 2008
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AusCERT Alert Summary
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Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
Member content until: Friday, January 02 2009
Comment: AusCERT is aware of a SPAM email circulating attempting to get
users to download a "new" antivirus program called "ANTIVIRUS -
Pro".
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OVERVIEW:
AusCERT is aware of a SPAM email circulating attempting to get
users to download a "new" antivirus program called "ANTIVIRUS -
Pro".
DETAILS:
The email's (see below) so far have all been of exactly the same
format, although they may change in the future. They inform users
that their "antivirus detected a virus in your computer" that the
virus is "Manipulating and changing structures in your antivirus
making it undetectable" and that their product (Antivirus Pro
1.0.0.1) is "the best version".
The download link goes to: (*this links to potentially live malware*)
hxxp:// gknf21 , net / i.php
Currently it looks like the potential malware attempts to start
RDP.
It also created a new user account as follows:
User: TsTest
Pass: 123
It adds this user account to the administrators group and then
adds the following Registry file and imports it to hide the user:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList]
"TsTest"=dword:00000000
Currently no AV products detect this as malware.
MITIGATION:
Block any spam email's that look like the one below or contain links
to gknf21 , net and IP address 125.129.57.166.
Check for any unexpected RDP (port TCP 3389) traffic.
DETAILS:
The SPAM email:
"
From: "Support" <support@service20.com>
Subject:Important message for you
Our antivirus detected a virus in your computer.
We do not have the best coders in the world, we do not give you ads and pop-ups
telling you to press on certain buttons to install it.
We recommend you our antivirus. Tested for 2 years, making it almost the best
only
for you. If you are not convinced, try it and we hope you will be satisfied.
Your virus details match our database details and are the following:
VIRUS NAME: W.744.A
Aliases: Virus.DOS.W.744 (Kaspersky), Univ/a (McAfee), Adif.732 (Symantec),
W-744 (Avira), W-744 (Sophos),
This is a File Infector virus. It is detected by the latest pattern file.
Manipulating and changing structures
in your antivirus making it undetectable.
Risk rating: Medium - High
Check out the best version, recommended by our specialists:
ANTIVIRUS - Pro v1.1
1. Please click here to download Antivirus Pro 1.0.0.1
2. Run Setup.exe
3. Install
Antivirus Pro 1.0.0.1 (C) 2008
"
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You have received this e-mail bulletin as a result of your organisation's
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maintained within your organisation, so if you do not wish to continue
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you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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