Virus Database

VCM.493

Description VCM.493

It is a dangerous nonmemory resident parasitic virus. It searches for .COM files and writes itself to the end of the file. Depending on the system timer it erases the disk sectors. It contains the text string:
V.C.M

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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.

I-Worm.Sobig.b (aka Palyh)

Description I-Worm.Sobig.b (aka Palyh)

Sobig.b is a worm virus spreading via the Internet as an e-mail attachment. The worm also spreads across local area networks.
The worm itself is a Windows PE EXE file, written in Microsoft Visual C++, and compressed by UPX. The file size is about 50KB when compressed (UPX). The decompressed size is about 110KB.
The worm activates from infected email only if 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 name msccn32.exe 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 directoris (root drive, current directory), but anyway its spreading routines will activate upon the next computer restart.
Spreading: email
To send out infected messages the worm uses a direct connection to the default SMTP server. To get victim email addresses the worm looks for .TXT, .EML, .HTML, .HTM, .DBX, .WAB files in all directrories on all available local drives, then retrieves email-like strings from the files that are found.
Following are possible message characteristics:
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 the file hnks.ini in the Windows directory and writes the found email addresses to this file.
Spreading via network
The worm deciphers all accessible network resources (other computers in a network) and copies itself to the auto-start directoris (if there are such subdirectories) of eligible machines.
WindowsAll UsersStart MenuProgramsStartUp
Documents and SettingsAll UsersStart MenuProgramsStartup

Updating
The worm downloads files from four Web places (that are "hardcoded" in the worm's body) and executes them. As a result the worm is able to update itself with new versions, and/or install other applications (trojan programs, for example).
Other
All worm routines (except "Updating") are active till May 31, 2003. Meaning the worm does not run its spreading (both email and network) routines after May 31, 2003.

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