Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:
  • file viruses
  • boot sector viruses
  • macro viruses
  • script viruses
Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Email-Worm

Email-Worms spread via email. The worm sends a copy of itself as an attachment to an email message or a link to its file on a network resource (e.g. a URL to an infected file on a compromised website or a hacker-owned website). In the first case, the worm code activates when the infected attachment is opened (launched). In the second case, the code is activated when the link to the infected file is opened. In both case, the result is the same: the worm code is activated. Email-Worms use a range of methods to send infected emails. The most common are: using a direct connection to a SMTP server using the email directory built into the worm’s code using MS Outlook services using Windows MAPI functions. Email-Worms use a number of different sources to find email addresses to which infected emails will be sent: the address book in MS Outlook a WAB address database .txt files stored on the hard drive: the worm can identify which strings in text files are email addresses emails in the inbox (some Email-Worms even “reply” to emails found in the inbox) Many Email-Worms use more than one of the sources listed above. There are also other sources of email addresses, such as address books associated with web-based email services.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.


Technical Details

This is an Internet worm that spreads via e-mail as an attached EXE file. The worm itself is a Win32 executable file about 70Kb in length, and written in VisualBasic. The worm has many bugs, and in many cases (in all cases in any environment?), doesn't work properly: the worm file is not attached to outgoing messages, and the message text appears different from what the worm intends.

To spread from an affected computer, the worm uses MS Outlook, obtains addresses from the MS Outlook Address Book as well as from the Windows Address Book, and sends messages there. The worm also sends an infected message to each time the spreading routine is run.

The message Subject and Body should appear as follows (these do not because of a bug in worm code). The [%CurrentDate%] here is the current date.

Message text:

Hey, now we can talk with this.. :-)
I wrote a new messenger, so that we can talk with it.
Install the self extractable zip attached

My movie clips..
I got a webcam, and I captured few movie clips of me.
Extract the attached self extractable, to see them.
A lil naughty stuff..
I got few great, erotic movie clips included in the self extractable

I downloaded these MP3s yesterday..
Hey, they r really great.. Extract the selfextractable zip to see them..

Just a little naughty stuff from me..
See the cake I prepared for you.. bye 4 now buddy..

Virus Warning..
Hey, take care..
Forward this mail to everyone you know. Today, [%CurrentDate%] FBI
announced that a serious virus is spreading. It is a file with a .VBS
extension, much like Love Bug. See the zip for it

A Business Issue..
My company is interested in the opportunities of creating a new
partnership with you. The presentation is attached, kindly see it and reply soon.

Legal Notice..
We are forced by our client to forward a legal notice to you dated
[%CurrentDate%]. Kindly see the attached details, and reply as soon as possible

Greeting Card 4 You..
Hope you are doing fine. See the ECard attached 4 you..

When the worm's EXE file is being run from the attachment, it copies itself to the Windows and Windows system directories with SysTray.exe and SysCheck.exe as names, and registers these files in the Windows registry auto-run section:

SystemTray = %WindowsDir%SysTray.exe

SystemCheck = %SystemDir%SysCheck.exe

note: the original SYSTRAY.EXE is located in the Windows system directory, not in the Windows directory as the worm does.

To hide its activity, the worm displays the following message:

Microsoft Windows
The application %ApplicationName% caused a general protection fault in
module Kernel.exe, and it will be terminated. Press OK to continue
[ OK ]

where %ApplicationName% is the worm's file name.

On the 4th of any month, upon being executed before 5 a.m., the worm overwrites the C:AUTOEXEC.BAT file with a Trojan that erases all files in the "C:My Documents" and *.DLL files in the C:Windows directories. The Trojan code also displays the following messages:

Please wait while setup update files. This may take a few minutes..
Now loading Windows..

The worm also have backdoor component that "opens" affected computer for a remote hacker. The backdoor routine allows:

report drives in system, directories and files on drives
read,write,copy,delete a file
change, create, remove a directory
read,write registry keys
send email to a specified address
execute a file
forse Windows to exit

The worm code contains the text "3DStars server", thus giving the worm name its name.

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