Email-Worm.VBS.Pila

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: VBS

Visual Basic Scripting Edition (VBScript) is a scripting language interpreted by Windows Script Host. VBScript is widely used to create scripts on Microsoft Windows operating systems.

Description

Technical Details

This Internet worm is a script, written in VBS language. It sends itself in e-mail messages using Microsoft Outlook.

When launched, the script writes the following text to file "plat�nico.txt", and then opens this file with NOTEPAD.EXE:

Sat�nico � o meu pensamento ao teu respeito e ardente � o meu desejo de apertar-te em minhas m�os, uma sede de vingan�a incontest�vel pelo que me fizeste ontem. A noite quente e calma chegara a ser angustiosa. Apareceste e nesta cama aconteceu...
Sorrateiramente te aproximaste...
Sem o m�nimo pudor...
Encostaste o teu corpo sem roupa no meu corpo n�.
Percebendo a minha aparente indiferen�a, aconchegaste-te a mim, e mordeste-me sem escr�pulos at� os mais �ntimos lugares jamais tocados de meu casto corpo.
E adormeci...
Hoje, quando acordei, procurei-te numa �nsia ardente, mas em v�o..."
Deixaste provas irrefut�veis do que ocorreu na noite que passou.
Grandes manchas no meu corpo e o alvo len�ol salpicado de sangue.
Esta noite recolho-me mais cedo para, na mesma cama te esperar.
Oh! Quando chegares, nem quero pensar com que perspic�cia, avidez e for�a eu quero te pegar para que n�o escapes mais de mim.
Em minhas m�os quero apertar-te at� o fim.
N�o haver� parte do teu corpo que os meus dedos n�o passar�o.
N�o descansarei enquanto ver sair o sangue quente de teu corpo.
S� assim livrar-me-ei de ti PULGA MALDITA.

Then, the worm copies itself to file:

%WINDOWS%explorer.dll.vbs

and modifies system.ini file, so that each time Explorer.exe starts, the worm will also start.

Then, the worm starts its replication procedure. It opens Microsoft Outlook Address Book, and sends to each recipient in the book an e-mail message with the following content:

Message subject is selected from the following list:
Texto imperd�vel!
Texto muito engra�ado!
O melhor texto que li nos �ltimos tempos...

Message body is:
Ol�!!
N�o posso falar muito sobre o texto porque se n�o perde a gra�a, L uma hist�ria de amor plat�nico...
Achei muito engra�ado vale a pena!!

Messages sent by the worm have an attachment - the worm itself.

After replicating, the worm finds all available disks and makes it copy named Pulga.txt.shs in the root folder of each disk.

Then, the worm changes several files in mIRC installation, if it exists, and adds a trojan script to them, so that the victim's computer can be remote controlled using the mIRC program.

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