Analysis by: Rika Joi Gregorio
ALIASES:

Trojan:DOS/Alureon.E(Microsoft), Trojan.Win32.TdlMbr.d (v)(Sunbelt), Rootkit.MBR.Sst.B (Boot image)(Bitdefender), BOOT/Alureon.EVL(Fortinet), Win32/Olmarik.AYA trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

The said files contain data it writes into the MBR (Master Boot Record). It does the said action to enable it to start even before the operating system is loaded.

  TECHNICAL DETAILS

File Size: 2,048 bytes
File Type: BOOT
Memory Resident: No
Initial Samples Received Date: 10 Apr 2012

Arrival Details

This Trojan may be dropped by other malware.

Autostart Technique

This Trojan e said files contain data it writes into the MBR (Master Boot Record). It does the said action to enable it to start even before the operating system is loaded.

NOTES:

This executes the file named boot which was dropped by variants of the malware TROJ_ALUREON.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.900.05
FIRST VSAPI PATTERN DATE: 10 Apr 2012
VSAPI OPR PATTERN File: 8.901.00
VSAPI OPR PATTERN Date: 11 Apr 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restore your system's Master Boot Record (MBR)

To restore your system's Master Boot Record (MBR):

• On Windows 2000, XP, and Server 2003:

  1. Insert your Windows Installation CD into your CD drive then restart your computer.
  2. When prompted, press any key to boot from the CD.
  3. On the Main Menu, type r to enter the Recovery Console.
    (Note for Windows 2000: After pressing r, type c to choose the Recovery Console on the repair options screen.)
  4. Type the number that corresponds to the drive and folder that contains Windows (usually C:\WINDOWS) and press Enter.
  5. Type your Administrator password and press Enter.
  6. In the input box, type the following then press Enter:
    fixmbr {affected drive}
  7. Type exit and press Enter to restart the system normally.

• On Windows Vista and 7:

  1. Insert your Windows Installation DVD into the DVD drive, then press the restart button on your computer.
  2. When prompted, press any key to boot from the DVD.
  3. Depending on your Windows Installation DVD, you might be required to choose the installation language. On the Install Windows window, choose your language, locale, and keyboard layout or input method. Click Repair your computer.
  4. Select Use recovery tools that can help fix problems starting Windows. Select your installation of Windows. Click Next.
  5. If the Startup Repair window appears, click Cancel, Yes, then Finish.
  6. In the System Recovery Options menu, click Command Prompt.
  7. In the Command Prompt window, type the following then press Enter:
    BootRec.exe /fixmbr
  8. Type exit and press Enter to close the Command Prompt window.
  9. Click Restart to restart your computer normally.

Step 3

Scan your computer with your Trend Micro product to delete files detected as BOOT_ALUREON.EVL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


Did this description help? Tell us how we did.