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 a Win32 PE EXE worm that spreads in e-mail messages using a system's default MAPI client. When started, it copies itself to %WINDOWS%Win32Dlw.EXE and %SYSTEM%Win32Exp.EXE, then writes the following key to the registry to start automaically with Windows: HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrent VersionRun RunExplorer=%SYSTEM%Win32Exp.EXE

If the current month is Semptember, the worm draws the following message on the screen:
Kad sve izgleda da umire,...ono se ustvari radja!

Then, the worm shows a message box with a '...' title and the following text:
Moja jutra su sve jasnija,
Moja snaga je prodornija,
Moje rijeci silno odjekuj
Moj mac je ostriji,
Moje noci su sve hladnije.
...ali dan je blizi kad ce
ljudi shvatiti da su samo,
i nista drugo nego ono sto
sam i JA!

After displaying a message, the worm does nothing for 2 minutes, and then sends itself to all senders of e-mail messages stored in the default MAPI client inbox.

All messages sent by the worm have the following properties:

Message subject is: Bin Ladenov zivot.
File attached: Bin Ladenov Zivot.exe
Message body: Ako jos do sada niste znali ko je Bin Laden onda vjerovatno cete naci ovaj dokument interesantnim u kojem je prikazano nekoliko vaznih momenata u, u njegovom zivotu, cak dok je jos radio pri CIA!

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