TR/VB.aez.7 - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/VB.aez.7
Date discovered:	29/12/2005
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	27.648 Bytes
MD5 checksum:	7d70255f56097a4c7af64aa42d023462
VDF version:	6.33.00.81 - Thu, 29 Dec 2005 12:41 (GMT+1)

General Method of propagation:
   • No own spreading routine

Alias:
   • Kaspersky: Trojan.Win32.VB.aez

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

Side effects:
   • Disable security applications
   • Downloads a malicious file
   • Drops files
   • Lowers security settings
   • Registry modification

Files It deletes the initially executed copy of itself.

The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
• %WINDIR%\disable.reg

– %malware execution directory%\%executed file name%.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

It tries to download a file:

– The location is the following:
• http://www.biobondy.com/source/bin/**********
It is saved on the local hard drive under: %SYSDIR%\ieschedule.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: BDS/VB.agz

Registry The following registry key is added:

– [HKLM\SYSTEM\CurrentControlSet\Control\InitRegKey]
   • "initMod" = "2"

The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Cache\Content]
   Old value:
   • "CacheLimit"=%user defined settings%
   New value:
   • "CacheLimit"=dword:00000400

Deactivate Windows XP Firewall:
– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile]
   Old value:
   • "DisableNotifications"=%user defined settings%
   • "DoNotAllowExceptions"=%user defined settings%
   • "EnableFirewall"=%user defined settings%
   New value:
   • "DisableNotifications"=dword:00000001
   • "DoNotAllowExceptions"=dword:00000000
   • "EnableFirewall"=dword:00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\
   Auto Update]
   Old value:
   • "AUOptions"=%user defined settings%
   • "DetectionStartTime"=%user defined settings%
   • "ConfigVer"=%user defined settings%
   • "ResetAU"=%user defined settings%
   • "ScheduledInstallDay"=%user defined settings%
   • "ScheduledInstallTime"=%user defined settings%
   New value:
   • "AUOptions"=dword:00000001
   • "DetectionStartTime"="2004.09.20 19:59:26"
   • "ConfigVer"=dword:00000001"
   • "ResetAU"=dword:00000001
   • "ScheduledInstallDay"=dword:00000000
   • "ScheduledInstallTime"=dword:00000003

Process termination List of services that are disabled:
• Windows Security Center
• Windows Firewall

Miscellaneous Internet connection:

It queries with the following names:
• www.microsoft.com
• www.biobondy.com

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

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• UPX

See a brief description here.

Description inserted by Daniel Constantin on Wed, 04 Jan 2006 15:47 (GMT+1)
Description updated by Andrei Gherman on Mon, 30 Jan 2006 13:21 (GMT+1)

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