Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 35,840 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 30 Jul 2010

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

NOTES:
Upon execution, it checks the presence of the following files to know if it is being executed inside a virtual machine:

  • %System%\drivers\hgfs.sys
  • %System%\drivers\prleth.sys
  • %System%\drivers\vmhgfs.sys
It also performs other VMWare verification such as:
  • computer name checking (if Sandbox)
  • if HKEY_LOCAL_MACHINE\HARDWARE\Description\System\SystemBiosVersion value is "VBOX"

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.348.03
FIRST VSAPI PATTERN DATE: 30 Jul 2010

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

Terminate a process file/s detected as TROJ_BREDOLAB.YA

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_BREDOLAB.YA. 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.


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