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BKDR_GINF.NIL

February 13, 2014
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor 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:

753,664 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

03 Jan 2014

Arrival Details

This backdoor 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 backdoor creates the following folders:

  • %Program Files%\Common Files\system32
  • %Program Files%\Common Files\system32\temp

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This backdoor modifies the following file(s):

  • %Windows%\inf\intl.PNF

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

It deletes the following files:

  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %System%\SETF.tmp
  • %System%\kbd101b.dll
  • %System%\SET15.tmp
  • %System%\kbd101c.dll
  • %System%\SET1B.tmp
  • %System%\kbd103.dll
  • %System%\SET21.tmp
  • %System%\kbd106.dll
  • %System%\SET27.tmp
  • %System%\kbdjpn.dll
  • %System%\SET2D.tmp
  • %System%\kbdkor.dll

(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}

HKEY_CLASSES_ROOT\CLSID\{E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}\
LocalServer32

HKEY_CLASSES_ROOT\DianZiShu.MyNSHandler

HKEY_CLASSES_ROOT\DianZiShu.MyNSHandler\Clsid

HKEY_CLASSES_ROOT\CLSID\{E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}\
ProgID

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Enable = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Size = "a"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
InitHits = "64"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International\CpMRU
Factor = "14"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\International
W2KLpk = "0"

Dropping Routine

This backdoor drops the following files:

  • %Program Files%\Common Files\system32\iexplorer.exe
  • %System%\SETC.tmp
  • %System%\SET12.tmp
  • %System%\SET18.tmp
  • %System%\SET1E.tmp
  • %System%\SET24.tmp
  • %System%\SET2A.tmp
  • %System%\SETF.tmp
  • %System%\SET15.tmp
  • %System%\SET1B.tmp
  • %System%\SET21.tmp
  • %System%\SET27.tmp
  • %System%\SET2D.tmp

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

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\CLSID
    • {E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}
  • In HKEY_CLASSES_ROOT\CLSID\{E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}
    • LocalServer32
  • In HKEY_CLASSES_ROOT
    • DianZiShu.MyNSHandler
  • In HKEY_CLASSES_ROOT\DianZiShu.MyNSHandler
    • Clsid
  • In HKEY_CLASSES_ROOT\CLSID\{E8CFC029-8420-4EAE-ADEF-915BDC77E1DC}
    • ProgID
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • CpMRU

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_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Enable = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Size = "a"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • InitHits = "64"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International\CpMRU
    • Factor = "14"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International
    • W2KLpk = "0"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %Program Files%\Common Files\system32\iexplorer.exe
  • %System%\SETC.tmp
  • %System%\SET12.tmp
  • %System%\SET18.tmp
  • %System%\SET1E.tmp
  • %System%\SET24.tmp
  • %System%\SET2A.tmp
  • %System%\SETF.tmp
  • %System%\SET15.tmp
  • %System%\SET1B.tmp
  • %System%\SET21.tmp
  • %System%\SET27.tmp
  • %System%\SET2D.tmp

Step 5

Search and delete these folders

[ 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%\Common Files\system32
  • %Program Files%\Common Files\system32\temp

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_GINF.NIL. 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.

Step 7

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Windows%\inf\intl.PNF

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Windows%\fonts\msgothic.ttf
  • %Windows%\fonts\msuigoth.ttf
  • %Windows%\fonts\MSMINCHO.TTF
  • %Windows%\fonts\Gulim.ttf
  • %Windows%\fonts\Gulimche.ttf
  • %Windows%\fonts\Dotum.ttf
  • %Windows%\fonts\Batang.ttf
  • %Windows%\fonts\Gungsuh.ttf
  • %Windows%\fonts\Simsun.ttf
  • %Windows%\fonts\nsimsun.ttf
  • %Windows%\fonts\MingLiU.ttf
  • %Windows%\fonts\pmingliu.ttf
  • %System%\SETF.tmp
  • %System%\kbd101b.dll
  • %System%\SET15.tmp
  • %System%\kbd101c.dll
  • %System%\SET1B.tmp
  • %System%\kbd103.dll
  • %System%\SET21.tmp
  • %System%\kbd106.dll
  • %System%\SET27.tmp
  • %System%\kbdjpn.dll
  • %System%\SET2D.tmp
  • %System%\kbdkor.dll


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