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Threat Encyclopedia

TROJ_RANSOM.BOV

ANALYSIS BY

Roland Marco Dela Paz


ALIASES:

Trojan:Win32/Ransom.FL (Microsoft)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.792.08

FIRST VSAPI PATTERN DATE:

21 Feb 2012

VSAPI OPR PATTERN File:

8.793.00

VSAPI OPR PATTERN Date:

22 Feb 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

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.BOV. 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.

NOTES:

Do as Step 2:

To identify and delete the malware/grayware file:

  1. Insert your Windows Installation CD in your CD-rom.
  2. Press the restart button of your computer.
  3. When prompted, press any key to boot from the CD.
  4. When prompted on the Main Menu, type r to enter the recovery console.
    (Note: On Windows 2000, after pressing r, type c to choose the Recovery Console in the repair options screen.)
  5. When prompted, type your administrator password to log on.
  6. Once logged in, type the drive that contains Windows in the command prompt that appears, then press Enter.
  7. Type the following, then press Enter:

    del %Windows%\explorer.exe
    del %System%\explorer.exe
    copy %Windows%\twexx32.dll %Windows%\explorer.exe
    del %Windows%\twexx32.dll

  8. Type exit to restart the system normally.


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