Worm/Fontra.C - Worm

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Summary

Full description

Statistics

Virus:	Worm/Fontra.C
Date discovered:	09/02/2007
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Low to medium
Static file:	No
File size:	~400.000 Bytes
VDF version:	6.37.01.61 - Fri, 09 Feb 2007 06:56 (GMT+1) - Fri, 09 Feb 2007 06:56 (GMT+1)
IVDF version:	6.37.01.61 - Fri, 09 Feb 2007 06:56 (GMT+1) - Fri, 09 Feb 2007 06:56 (GMT+1)

General Method of propagation:
   • Peer to Peer

Aliases:
   • Mcafee: W32/Vbbot
   • Kaspersky: Virus.Win32.Fontra.c
   • F-Secure: Virus.Win32.Fontra.c
   • Sophos: W32/Fontra-F
   • Grisoft: Worm/Delf.ATB
   • Eset: Win32/VB.NJQ

It was previously detected as:
   • TR/Dldr.Fontra.C.1

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

Side effects:
   • Drops files
   • Drops a malicious file

Right after execution the following information is displayed:

Files It copies itself to the following locations:
   • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\dllhost.exe
   • %PROGRAM FILES%\setup.exe
   • %PROGRAM FILES%\Track_03.exe
   • %PROGRAM FILES%\Video.exe

It copies itself within archives to the following locations:
   • %PROGRAM FILES%\a.zip
   • %PROGRAM FILES%\b.zip
   • %PROGRAM FILES%\c.zip

It creates the following directories:
   • %BearShare's shared folder%\_
   • %LimeWire's shared folder%\_
   • %Morpheus's shared folder%\_
   • %Shareaza's shared folder%\_

The following files are created:

– Non malicious files:
   • %PROGRAM FILES%\A.ico
   • %PROGRAM FILES%\B.ico
   • %SYSDIR%\vbzip10.dll

– %PROGRAM FILES%\uy.exe Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Fontra.C.2

It tries to executes the following files:

– Filename:
   • %PROGRAM FILES%\bearshare\bearshare.exe

– Filename:
   • %PROGRAM FILES%\limewire\limewire.exe

– Filename:
   • %PROGRAM FILES%\morpheus\morpheus.exe

– Filename:
   • %PROGRAM FILES%\shareaza\shareaza.exe

P2P In order to infect other systems in the Peer to Peer network community the following action is performed:

– It searches for the following directories:
   • %BearShare's shared folder%\_
   • %LimeWire's shared folder%\_
   • %Morpheus's shared folder%\_
   • %Shareaza's shared folder%\_

   If successful, the following file is created:
   • %random character string%.zip

   The archive contains a copy of the malware inside.

The shared directory might look like the following:

File details Programming language:
The malware program was written in Visual Basic.

See a brief description here.

Description inserted by Andrei Gherman on Wed, 28 Mar 2007 09:57 (GMT+1)
Description updated by Andrei Gherman on Wed, 28 Mar 2007 13:59 (GMT+1)

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