Analysis by: Christopher Daniel So
ALIASES:

PWS:Win32/Frethog.MS;Packed.Win32.Klone.bq;Mal/Frethog-D;W32/Klone.BQ!tr;Trojan.PWS.Gamania.28872

 PLATFORM:

Windows 2000, XP, 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 may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size: 84,480 bytes
File Type: DLL
File Compression: Aspack
Memory Resident: No
Initial Samples Received Date: 12 Nov 2010

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj.1

HKEY_CLASSES_ROOT\CLSID\{C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}

HKEY_CLASSES_ROOT\Interface\{C8414F9F-BA90-4600-B7EA-0CEFAF5A0636}

HKEY_CLASSES_ROOT\TypeLib\{C8414F92-BA90-4600-B7EA-0CEFAF5A0636}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}

It adds the following registry entries to install itself as a Browser Helper Object (BHO):

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj
(Default) = "IEHlprObj Class"

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj\CurVer
(Default) = "IEHlprObj.IEHlprObj.1"

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj.1
(Default) = "IEHlprObj Class"

HKEY_CLASSES_ROOT\IEHlprObj.IEHlprObj.1\CLSID
(Default) = "{C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}"

HKEY_CLASSES_ROOT\CLSID\{C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}
(Default) = "IEHlprObj Class"

HKEY_CLASSES_ROOT\CLSID\{C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}\
InprocServer32
(Default) = "{malware path and file name}.dll"

HKEY_CLASSES_ROOT\Interface\{C8414F9F-BA90-4600-B7EA-0CEFAF5A0636}
(Default) = "IIEHlprObj"

HKEY_CLASSES_ROOT\TypeLib\{C8414F92-BA90-4600-B7EA-0CEFAF5A0636}\
1.0
(Default) = "IEHelper 1.0 Type Library"

HKEY_CLASSES_ROOT\TypeLib\{C8414F92-BA90-4600-B7EA-0CEFAF5A0636}\
1.0\0\win32
(Default) = "{malware path and file name}.dll"

HKEY_CLASSES_ROOT\TypeLib\{C8414F92-BA90-4600-B7EA-0CEFAF5A0636}\
1.0\HELPDIR
(Default) = "%Current%"

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.616.10
VSAPI PATTERN Date: 12 Nov 2010
VSAPI PATTERN Date: 11/12/2010 12:00:00 AM

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

Close all opened browser windows

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
    • IEHlprObj.IEHlprObj
  • In HKEY_CLASSES_ROOT
    • IEHlprObj.IEHlprObj.1
  • In HKEY_CLASSES_ROOT\CLSID
    • {C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}
  • In HKEY_CLASSES_ROOT\Interface
    • {C8414F9F-BA90-4600-B7EA-0CEFAF5A0636}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {C8414F92-BA90-4600-B7EA-0CEFAF5A0636}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • {C8414FA0-BA90-4600-B7EA-0CEFAF5A0636}

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_EMEID.A. 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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