TROJ_BHO.ABT

 Analysis by: Sabrina Lei Sioting

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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:

131,072 bytes

File Type:

DLL

Initial Samples Received Date:

09 Nov 2011

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.

Autostart Technique

This Trojan adds the following registry keys to install itself as a Browser Helper Object (BHO):

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{314A5833-8490-4a3b-904A-110444F25E50}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\XMLLIB.WINXML2

HKEY_CLASSES_ROOT\CLSID\{314A5833-8490-4a3b-904A-110444F25E50}

HKEY_CLASSES_ROOT\Interface\{0B6EF17E-18E5-4449-86EA-64C82D596EAE}

HKEY_CLASSES_ROOT\Interface\{B1E68D42-02C4-465B-8368-5ED9B732E22D}

HKEY_CLASSES_ROOT\TypeLib\{CCE1E84E-55A8-4F3B-B590-20C06119DE57}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
XMLLIB.WINXML2

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{314A5833-8490-4a3b-904A-110444F25E50}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{0B6EF17E-18E5-4449-86EA-64C82D596EAE}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{B1E68D42-02C4-465B-8368-5ED9B732E22D}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{CCE1E84E-55A8-4F3B-B590-20C06119DE57}

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.566.06

FIRST VSAPI PATTERN DATE:

11 Nov 2011

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

Identify and terminate files detected as TROJ_BHO.ABT

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Delete this registry key

[ 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_CLASSES_ROOT
    • XMLLIB.WINXML2
  • In HKEY_CLASSES_ROOT\CLSID
    • {314A5833-8490-4a3b-904A-110444F25E50}
  • In HKEY_CLASSES_ROOT\Interface
    • {0B6EF17E-18E5-4449-86EA-64C82D596EAE}
  • In HKEY_CLASSES_ROOT\Interface
    • {B1E68D42-02C4-465B-8368-5ED9B732E22D}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {CCE1E84E-55A8-4F3B-B590-20C06119DE57}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • XMLLIB.WINXML2
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {314A5833-8490-4a3b-904A-110444F25E50}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {0B6EF17E-18E5-4449-86EA-64C82D596EAE}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {B1E68D42-02C4-465B-8368-5ED9B732E22D}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {CCE1E84E-55A8-4F3B-B590-20C06119DE57}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {314A5833-8490-4a3b-904A-110444F25E50}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BHO.ABT. 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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