Email-Worm.Win32.Zoher

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.

Description

Technical Details

This is a virus-worm that spreads via the Internet attached to infected e-mails. The worm itself is a Windows PE EXE file 6.6Kb in length, and it is written in Assembler.

The infected messages contain:

Subject: Fw: Scherzo!
Attachment: javascript.exe

The message body is long, and it is written in Italian (see it below).

To run from an infected message, the worm uses a security breach (IFRAME vulnerability, similar to that one used by the "Nimda" worm). So the worm may be activated from an infected e-mail by simply reading or previewing the message.

The worm does not install itself to the system and is not activated anymore (except cases when a user opens an infected e-mail twice or more).

To send infected messages, the worm uses a direct connection to the default SMTP server. To obtain e-mail addresses, it scans the WAB database.

To send an infected message with an attached file, the worm downloads a message image from the http://banners.interfree.it site. As a result the worm author can upgrade it with new versions, or force existing worm copies to send other malicious code.

The message body appears as follows:

 Con questa mail ti e stata spedita la FortUna; non la 
 fortuna e basta, e neanche la Fortuna con la F 
 maiuscola, ma addirittura la FortUna con la F e la U 
 maiuscole. Qui non badiamo a spese. Da oggi avrai 
 buona fortuna, ma solo ed esclusivamente se ti liberi 
 di questa mail e la spedisci a tutti quelli che conosci. 
 Se lo farai potrai: 
 - produrti in prestazioni sessuali degne di King Kong 
 per il resto della tua vita 
 - beccherai sempre il verde o al massimo il giallo ai semafori
 - catturerai tutti e centocinquantuno i Pokemon incluso 
 l'elusivo Mew 
 - (per lui) quando andrai a pescare, invece della solita 
 trota tirerai su una sirena tettona nata per sbaglio con gambe umane 
 - (per lei) lui sara talmente innamorato di te che ti 
 come una sirena tettona nata per sbaglio con le gambe 
 Se invece non mandi questa mail a tutta la tua list 
 entro quaranta secondi,allora la tua esistenza diventera 
 una 
 grottesca sequela di eventi tragicomici, una colossale 
 barzelletta che suscitera il riso del resto del pianeta, 
 e ticondurra ad una morte orribile, precoce e solitaria...
 No, dai, ho esagerato: hai sessanta secondi.
 Cascaci: e' tutto vero.
 Puddu Polipu, un grossista di aurore boreali
 cagliaritano, spedi' questa mail a tutta la sua lista
 ed il giorno dopo vinse il Potere Temporale della Chiesa
 alla lotteria della parrocchia.
 Ciccillo Pizzapasta, un cosmonauta campano che
 soffriva di calcoli, si preoccupo di diffondere
 questa mail: quando fu operato si scopri' che i suoi
 calcoli erano in realta diamanti grezzi.
 GianMarco Minaccia, un domatore di fiumi del Molise
 che non aveva fatto circolare questa mail,
 perse entrambe le mani in un incidente subito dopo
 aver comprato un paio di guanti.
 Erode Scannabelve, un pediatra mannaro di
 Trieste,non spedi a nessuno questa mail: dei suoi tre figli
 uno comincio a drogarsi,
 il secondo entro in Forza Italia
 e il terzo si iscrisse a Ingegneria.

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