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VBS/Downloader-BEN

This page shows details and results of our analysis on the malware VBS/Downloader-BEN

Threat Detail

Malware Type: Trojan

Malware Sub-type: Downloader

Discovery Date: 2007-09-19

Next Steps:

Overview

Detection was added to cover protection against a malicious VBScript file called "1.vbs" , having a filesize of 492 bytes.

 


Minimum DAT

5123 (2007-09-19)

Updated DAT

5123 (2007-09-19)

 Minimum Engine

5.1.00

File Length

492

 Description Added

2007-09-19

Description Modified

2007-11-26

Malware Proliferation

Characteristics

Detection was added to cover protection against a malicious VBScript file called "1.vbs" , having a filesize of 492 bytes.

It is a very small trojan who's solely aim is to download a 32 bit PE executable file and write it to the root of the c: drive as: "c:\Rtsecar.exe".

The web address where the binary was posted on was: hxxp://10.203.##.172 , the exact address being omitted with # markings on purpose here.

The binary file is currently not posted online any more.

As the website being communicated is normally controlled by the malware author, any files being downloaded can be remotely modified and the behaviour of these new binaries altered - possibly with every user infection.

Symptoms

  • Presence of the file "1.vbs" , having a filesize of 492 bytes.
  • Presence of the file "c:\Rtsecar.exe".
  • Unexpected traffic to hxxp://10.203.##.172 , the exact address being omitted with # markings on purpose here.

 

Method of Infection

Infection starts with manual execution of the VBScript file - there's no exploit associated with it.

Removal

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

But in some particular cases, the following steps need to be taken.

Please go to the Microsoft Recovery Console and restore a clean MBR.

On Windows XP:

  • Insert the Windows XP CD into the CD-ROM drive and restart the computer.
  • When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
  • Select the Windows installation that is compromised and provide the administrator password.
  • Issue 'fixmbr' command to restore the Master Boot Record
  • Follow onscreen instructions.
  • Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

  • Insert the Windows CD into the CD-ROM drive and restart the computer.
  • Click on "Repair Your Computer".
  • When the System Recovery Options dialog comes up, choose the Command Prompt.
  • Issue 'bootrec /fixmbr' command to restore the Master Boot Record.
  • Follow onscreen instructions.
  • Reset and remove the CD from CD-ROM drive.

Variants

United States - English