CAUTION!!!!! : SCD sheet music

Ian Brockbank

Message 21523 · 16 Jun 2000 14:20:51 · Fixed-width font · Whole thread

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Norman Dahl <xxxxxx@xxxxxxxxxx.xxx> wrote:

> I strongly suspect that Catherine Linnen's mail with this
> title was infected with a virus (sorry, Catherine, not your fault).

Indeed.

See http://www.datafellows.com/v-descs/kak.htm

F-Secure Virus Information Pages


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NAME: Kak
ALIAS: Wscript.KakWorm, KakWorm

Kak is a worm that embeds itself to every email sent from the infected
system, without any attachment, like BubbleBoy does. For further
information about BubbleBoy, see the description:
http://www.F-Secure.com/v-descs/bubb-boy.htm

Kak is written in JavaScript and it works on both English and French
versions of Windows 95/98 if Outlook Express 5.0 is installed. It does
not work in a typical Windows NT installation.

The worm uses a known security vulnerability that affects Outlook
Express. Once the user receives an infected email message, and opens or
views the message in the preview pane, the worm creates a file "kak.hta"
to the Windows Startup directory.

Next time when the system is restarted, the worm activates. It replaces
"c:\autoexec.bat" with a batch file that deletes the worm from the
Startup directory. The original "autoexec.bat" is copied to "C:\AE.KAK".

It also modifies the message signature settings of Outlook Express 5.0
replacing the current signature with an infected file,
"C:\Windows\kak.htm".

Therefore every message sent with Outlook Express after that will
contain the worm.

Next it modifies the Windows registry in a such way that it will be
executed in every system startup. The key it adds to the registry is:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\cAg
0u

The .hta file that the virus creates and will be executed is saved to
Windows System directory. In first day of each month if the number of
hours is more than 17 (i.e. 6pm or later), the worm will show an alert
box with the following text:

Kagou-Anit-Kro$oft say not today!


Then the worm causes the Windows to shut down.

F-Secure Anti-Virus detects the worm. When the worm has been detected,
the user should delete the following files, if they exist:

C:\Windows\kak.htm
C:\Windows\System\(filename).hta
where (filename) is a variable, and it changes from one system
to another

C:\Windows\Start Menu\Programs\Startup\kak.hta
C:\Windows\Menu Demarrer\Programmes\Demarrage\kak.hta

The "autoexec.bat" can be restored by copying the "C:\AE.KAK" to
"C:\autoexec.bat".

Kak uses a known security hole in Microsoft Outlook Express to create
the local HTA file.

If active scripting is disabled from Outlook Express, then the worm will
not work.

Microsoft has more information on this problem available at:
http://www.microsoft.com/Security/Bulletins/MS99-032faq.asp

They have also a patch to fix this problem at
http://www.microsoft.com/security/Bulletins/ms99-032.asp

[Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure]

--
Ian Brockbank, Indigo Active Vision Systems, The Edinburgh Technopole,
Bush Loan, Edinburgh EH26 0PJ Tel: 0131-475-7234 Fax: 0131-475-7201
work: xxx@xxxxxx-xxx.xxx personal: Xxx.Xxxxxxxxx@xxxxxxx.xxx
web: XxxxxxxxXxxxx@xxxxxxx.xxx http://www.scottishdance.net/
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