Virus:W32/Tvido.B
Date discovered:29/01/2008
Type:File infector
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:No
File size:~12.000 Bytes
IVDF version:7.06.00.58

 General Methods of propagation:
   • Infects files
   • Mapped network drives


Aliases:
   •  Symantec: W32.Tvido.B!inf
   •  Mcafee: W32/Tvido.b
   •  Kaspersky: Virus.Win32.Tvido.b
   •  Sophos: W32/Tvido-A
   •  VirusBuster: Win32.Tvido.B
   •  Eset: Win32/Tvido.C
   •  Bitdefender: Win32.Tvido.B

Non working variants may be identified as:
   •  W32/Tvido.dam


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Infects files

 File infection Infector type:

Prepender - The virus code is added at the begining of the infected file.
–  2 sections are added to the infected file.

Stealth:
 EPO (Entry Point Obscuring) - The infected file's EP (Entry Point) remains the same. The virus patches the program code to redirect execution to the viral code.


Self Modification:

Polymorphic - The entire virus code changes from one infection to another. The virus contains a polymorphic engine.


Method:

This direct-action infector actively searches for files.


Infection length:

Approximately 15.000 Bytes


The following files are infected:

By exact path:
   • *.exe

Files in any of the following directories:
   • %all directories%
   • %network shares%

 Miscellaneous String:
Furthermore it contains the following string:
   • Virus WeeD 2.0 Made in Belarus!

Description inserted by Daniel Constantin on Monday, February 15, 2010
Description updated by Daniel Constantin on Monday, February 15, 2010

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