Analysis by: Nice Yutuc
 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

It attempts to connect to the a specific URL to download possible malicious file. As a result, routines of the downloaded file are exhibited in the system.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 14848 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 15 Feb 2012

Arrival Details

This Trojan may be dropped by other malware.

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Internet Settings
ProxyEnable = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
Services\6to4\Parameters
ServiceDll = "rudll.dll"

NOTES:

It attempts to connect to the following URL to download possible malicious file:

  • http://{BLOCKED}.{BLOCKED}.203.173:80

As a result, routines of the downloaded file, may also be exhibited on the affected system.

In order to execute its intended routine, this TROJAN needs its other component.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.776.04
FIRST VSAPI PATTERN DATE: 15 Feb 2012
VSAPI OPR PATTERN File: 8.777.00
VSAPI OPR PATTERN Date: 15 Feb 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • ProxyEnable = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\6to4\Parameters
    • ServiceDll = "rudll.dll"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_GENOME.BCK. 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.