Virus Database

I-Worm.Sobig.b

Description I-Worm.Sobig.b
This is a worm virus spreading via the Internet as a file attachment to infected emails. The worm also spreads via local area networks.

The worm itself is a Windows PE EXE file, written in Microsoft Visual C++, and is compressed by UPX. File size ranges from 50KB (UPX) and above - the decompressed size is 110KB and above.

The worm activates from infected email only when a user clicks on the attached file.

When run the worm installs itself to the system and runs its spreading routine.

Installing

While installing the worm copies itself to the Windows directory under the "msccn32.exe" name and registers itself in the system registry auto-run keys:


HKCUSoftwareMicrosoftWindowsCurrentVersionRun
System Tray = %WindowsDir%msccn32.exe

HKLMSoftwareMicrosoftWindowsCurrentVersionRun
System Tray = %WindowsDir%msccn32.exe
Because of a bug the worm in some cases copies itself to the wrong directories (root drive, current directory), but despite this, its spreading routines will activate upon the next computer restart.

Spreading via email

To send infected messages the worm uses a direct connection to the default SMTP server. To get victim emails the worm looks for .TXT, .EML, .HTML, .HTM, .DBX, .WAB files in all directories on all available local drives. Palyh then gets email-like strings from files the files that are found.




Messages contain the following attributes:

From:


support@microsoft.com
Subject:


Re: My application
Re: Movie
Cool screensaver
Screensaver
Re: My Your password
Re: Approved (Ref: 3394-65467)
Approved (Ref: 38446-263)
Your Message Body:


All information is in the attached file.
Attached file name:


your_details.pif
ref-394755.pif
approved.pif
password.pif
doc_details.pif
screen_temp.pif
screen_doc.pif
movie28.pif
application.pif
The worm also creates a file named "hnks.ini" in the Windows directory and writes to this file the email addresses that were found on an infected machine.

Spreading via network

The worm enumerates all accessible network resources (other computers in a network) and copies itself to into the present auto-run directories.


WindowsAll UsersStart MenuProgramsStartUp
Documents and SettingsAll UsersStart MenuProgramsStartup
Updating

The worm downloads files from four Web addresses (they are "hardcoded" in the worm body) and executes them. As a result the worm is able to "upgrade" itself with new versions, and/or install other applications (trojan programs, for example).

Other

All worm routines (except "Updating" - see above) are active until May 31, 2003. Meaning, the worm does not run its spreading (both email and network) routines after May 31, 2003.

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Rasek.1489.b

Description Rasek.1489.b

This is a dangerous memory resident multipartite encrypted virus. While executing an infected file it writes itself to the MBR of the hard drive and hooks INT 13h, 12h. By hooking INT 13h this virus releases the stealth mechanism on reading the infected MBR. It also writes a trojan program to the floppy disk boot sectors. That program erases the hard drive FAT while loading from that floppy. Sometimes the virus also erases the FAT on loading from infected MBR.
By hooking INT 21h the virus infects COM and EXE files that are executed, it writes itself to the end of the files. The virus contains the text string "AND.COM" and does not infect the files that contains that string in their names (COMMAND.COM). The virus also contains the text strings:
"RASEK" v3.0,from La Coruña(SPAIN).Ap93

Rasek.1490

Description Rasek.1490

This is a dangerous memory resident multipartite encrypted virus. While executing an infected file it writes itself to the MBR of the hard drive and hooks INT 13h, 12h. By hooking INT 13h this virus releases the stealth mechanism on reading the infected MBR. It also writes a trojan program to the floppy disk boot sectors. That program erases the hard drive FAT while loading from that floppy. Sometimes the virus also erases the FAT on loading from infected MBR.
By hooking INT 21h the virus infects COM and EXE files that are executed, it writes itself to the end of the files. The virus contains the text string "AND.COM" and does not infect the files that contains that string in their names (COMMAND.COM). The virus also contains the text strings:
RaseK v2.0,from LA CORUÑA(SPAIN).Mar93

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