F-Secure Virus Descriptions : Email-Worm.Win32.Atak.h
[Summary] | [Detailed Description] | [Detection]
| NAME: | Email-Worm.Win32.Atak.h |
| ALIAS: | Email-Worm.Win32.Mydoom.ad, I-Worm.Atak.h, Atak.h |
A new variant of the Atak worm was found on 15th of December
2004. The worm spreads in emails that have a subject "Merry
X-Mas!" or "Happy New Year!".
When run the worm creates a mutex named "2k5" to avoid running
more than once simultaneously.
The worm copies itself as:
%WinSysDir%\dec25.exe
where %WinSysDir% is Windows System folder, for example
'C:\Windows\System32\' on a default installation of Windows XP.
The worm adds an entry to the win.ini file using the Windows API
call WritePrivateProfileStringA from the Kernel32.dll. The entry
will look like this:
[windows]
run="%SysDir%\dec25.exe"
As win.ini is not supported by Windows NT, 2000 and XP, on these
operating system the changes will be added to the Registry. As as
result Windows will start the worm on every time it boots.
Email spreading
Atak.h worm will collect e-mail address from files with certain
extensions on all hard disks and RAM drives from C: to Z. Files
with the following extensions will be checked:
.txt
.log
.html
.msg
.eml
.mht
.dbx
.asp
.php
.jsp
.htm
The worm has its own SMTP engine which it uses to send infected
emails. The messages sent by the worm will have one of the
following subjects:
Merry X-Mas!
Happy New Year!
The worm uses one of the following message body texts:
Happy New year and wish you good luck on next year!
Merry Christmas! Happy New Year! 2005 will be the beginning!
The worm attaches itself to an infected message using a name
combined of the following extensions:
.pif
.com
.bat
.scr.
For example the name can be scr.pif or scr.scr. In some cases the
worm can send itself in a ZIP archive.
Here's a screenshot of an infected message:
F-Secure Anti-Virus detects Atak.h worm with the following
update:
[FSAV_Database_Version]
Version=2004-12-15_01
Technical Details:
Jarkko Turkulainen, December 15th, 2004;
F-Secure Corporation
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