Class
Email-Worm
Platform
Win32

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.

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 worm virus spreading being attached to Email messages, through IRC channels, infecting PE EXE files (Win32 executable files), VBS files and incorporating its copies to RAR and ARJ archives. The worm itself is Win32 executable file about 28Kb of length, and it infects Win32 machines only.

The worm has many bugs and in most of cases crash the system or corrupt files while infecting them.

Installing

When infected file is run, the worm copies itself to Windows system directory with one of the names randomly selects from following list depending on current day:

napster.exe
newbillgates.exe
HonNaCigana2.exe
FreeSoftGSM.exe
game.exe
call.exe

To access that copy later by its name the worm stores that name in Registry key:

HKLMSOFTWAREInfluenzaLab
MicrosoftOE = %wormname%

where %wormname% is the file name of worm copy (it will be used below as well).

The worm also copies itself to Windows directory with PornoChat.exe name and registers that file in Registry auto-run key:

HKLMSOFTWAREMicrosoftWindowsCurrentVersionRun
MicrosoftOE = %WinDir%PornoChat.exe

Updating

The worm is able to update itself. To do that it sets start page for MS Internet Explorer to "www.volny.cz/radix16/flu/update.gif". As a result on each Internet Explorer that GIF file is downloaded to affected machine. The worm then copies that file with C:updateFLU.gif name and processes it.

That can be not usual GIF image file - the worm looks for data that is attached to main GIF image data. The attached data has special format. It may contain a list of email addresses (it is stored to C:Heyya.txt file and is used later) and/or EXE file image.

Read more

Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com

Found an inaccuracy in the description of this vulnerability? Let us know!
Kaspersky IT Security Calculator
Calculate
Check now
Learn more about cybersecurity on Kaspersky Encyclopedia
For free
Learn more
Confirm changes?
Your message has been sent successfully.