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TROJ_FAM_00013ea.TOMA

October 13, 2012
 ALIASES:

Trojan:Win32/Agent (Microsoft); AdClicker-JA (McAfee); Trojan.Gen (Symantec); Trojan-Clicker.Win32.VB.exv, Trojan-Clicker.Win32.VB.exv (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); DeepScan:Generic.VB.Clicker.FA291164 (FSecure)

 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:

77,824 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Jun 2012

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.

Installation

This Trojan creates the following folders:

  • %Program Files%\hd

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}\InprocServer32

HKEY_CLASSES_ROOT\QvodAdBlocker.QvodBlock

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
ProgID = "QvodAdBlocker.QvodBlock"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
TypeLib = "{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
VERSION = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
QvodAdBlocker.QvodBlock
Clsid = "{A159F450-51A6-4CCA-A5BF-011C41A52FF9}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Dropping Routine

This Trojan drops the following files:

  • %Windows%\userid.txt
  • %Windows%\reg.reg

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {99586BE3-89F9-40BE-AA1A-D2D8492D6F47}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {69CB71DE-CB9D-42E5-B097-3B1BE621643B}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
    • TypeLib
  • In HKEY_CLASSES_ROOT\CLSID
    • {A159F450-51A6-4CCA-A5BF-011C41A52FF9}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
    • InprocServer32
  • In HKEY_CLASSES_ROOT
    • QvodAdBlocker.QvodBlock

Step 4

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_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
    • ProgID = "QvodAdBlocker.QvodBlock"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
    • TypeLib = "{99586BE3-89F9-40BE-AA1A-D2D8492D6F47}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A159F450-51A6-4CCA-A5BF-011C41A52FF9}
    • VERSION = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\QvodAdBlocker.QvodBlock
    • Clsid = "{A159F450-51A6-4CCA-A5BF-011C41A52FF9}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
    • ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{69CB71DE-CB9D-42E5-B097-3B1BE621643B}
    • ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Windows%\userid.txt
  • %Windows%\reg.reg

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Program Files%\hd

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAM_00013ea.TOMA. 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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