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
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.Read more
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.Description
Technical Details
This is the worm virus spreading via the Internet being attached to infected emails. The worm itself is a Windows PE EXE file about 107Kb of length, written in Visual Basic (VB5).
The worm activates from infected email only in case a user clicks on attached file. The worm then installs itself to the system, runs spreading routine and payload.
The infected messages have different texts and attached file names, they are randomly selected by worm while spreading from following variants:
Subjects are:
Bodies are:
Saludos
Me ha llegado el virus %virusname%, de tu ordenador, ya es la segunda vez
Pasa la vacuna que te env�o, de Norton Antivirus
�Y ten mas cuidado la pr�xima vez!
Un Saludo
Por Favor, revise su ordenador, me ha enviado el virus %virusname%
Le env�o la vacuna facilitada por Norton Antivirus
Un Saludo
Hola, perdona, que te moleste, pero me has enviado un virus, el %virusname%
Te env�o la vacuna de panda, �Ten mas cuidado la pr�xima vez!
Hola
Te env�o un fichero que me bajado de Internet, es una broma. mueve �l
Rat�n por toda la pantalla. No se quita ni pulsando control+alt+supr,
Jeje, al final hay que reiniciar.
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Attach filenames are:
AntiMagistr.exe
AntiNimda.exe
AntiSircam.exe
To send infected messages the worm scans *.EML, *.NWS, and *.DBX files, gets victim email addresses from there, then connects to SMTP server smtp.terra.es,then sends infected messages.
Installing
While installing the worm copies itself to Windows system directory with the REGWIZ.EXE name (and overwrites original Windows REGWIZ.EXE file in there),and registers this file in system registry auto-run key:
The worm also sets ReadOnly, Hidden and System attributes for this file.
The worm then displays fake error message:
[ OK ]
Payload
The worm adds to C:MSDOS.SYS file the command:
The effect of this is unability to break or trace booting process under Win9x systems.
The worm then stays in Windows memory as hidden application (system service) and runs payload routine - the mouse cusror is randomly moved on the screen, and mouse becomes unusable.
The worm also runs its internal counter in the registry key:
ejec = %number%
and increases this valie on each run. When this counter reaches 75, the worm alteres the registry key:
ScreenSaveActive = 0
then exits Windows and restarts the machine.
Read more
Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com