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Downloader-BCV

This page shows details and results of our analysis on the malware Downloader-BCV

Threat Detail

Malware Type: Trojan

Malware Sub-type: Downloader

Discovery Date: 2007-06-20

Next Steps:

Overview

Detection was added to cover for a malicious 32 bit PE downloader file originally called "systime.exe" , having a filesize of 8.192 bytes.


Minimum DAT

5059 (2007-06-22)

Updated DAT

5371 (2008-08-27)

 Minimum Engine

5.1.00

File Length

8.192

 Description Added

2007-06-20

Description Modified

2007-06-20

Malware Proliferation

Characteristics

Detection was added to cover for a malicious 32 bit PE downloader file originally called "systime.exe" , having a filesize of 8.192 bytes.

Upon running, it runs silently, no gui messageboxes appear on the screen.

It immediately copies itself onto the %system32 folder and creates a registry entry to run automatically upon system start, for example on win2k:

  • c:\WINNT\system32\systime.exe

It might also copy itself to the root of the c: drive, with the c:\systime.exe location actually hardcoded inside.

It tries to download a binary called "network.exe" from : http://drsun####.go#.icp##.## , but at test time the binary was not accessible. The exact address is changes on purpose here with # markings.

 

Symptoms

  • Presence of "systime.exe" , having a filesize of 8.192 bytes.
  • Network connections to  http://drsun####.go#.icp##.## , the exact address is changes on purpose here with # markings.

Method of Infection

Manual infection - 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