TROJ_FAM_0001229.TOMA


 ALIASES:

TrojanDropper:Win32/Dunik!rts (Microsoft); generic!bg.iov (McAfee); Spyware.ADH (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Gen:Trojan.Heur.mrZ@H51gpomi (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:

1,251,487 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 May 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:

  • %User Temp%\T011716120093000026458

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This Trojan 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%\SET2.tmp
  • %System%\kbd101b.dll
  • %System%\SET4.tmp
  • %System%\kbd101c.dll
  • %System%\SET6.tmp
  • %System%\kbd103.dll
  • %System%\SET8.tmp
  • %System%\kbd106.dll
  • %System%\SETA.tmp
  • %System%\kbdjpn.dll
  • %System%\SETC.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\{D173E10A-001D-4318-9822-8C97A8418482}

HKEY_CLASSES_ROOT\CLSID\{D173E10A-001D-4318-9822-8C97A8418482}\
LocalServer32

hkey_classes_root\{malware file name}.externalnshandler

hkey_classes_root\{malware file name}.externalnshandler\clsid

HKEY_CLASSES_ROOT\CLSID\{D173E10A-001D-4318-9822-8C97A8418482}\
ProgID

HKEY_CLASSES_ROOT\CLSID\{9C453F21-396D-11D5-9734-70E252C10127}

HKEY_CLASSES_ROOT\CLSID\{9C453F21-396D-11D5-9734-70E252C10127}\
LocalServer32

hkey_classes_root\{malware file name}.ebooknshandler

hkey_classes_root\{malware file name}.ebooknshandler\clsid

HKEY_CLASSES_ROOT\CLSID\{9C453F21-396D-11D5-9734-70E252C10127}\
ProgID

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
User Agent\Post Platform

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 Trojan drops the following files:

  • %User Temp%\t011716120093000026458\{malware file name}.exe
  • %System%\SET1.tmp
  • %System%\SET3.tmp
  • %System%\SET5.tmp
  • %System%\SET7.tmp
  • %System%\SET9.tmp
  • %System%\SETB.tmp
  • %System%\SET2.tmp
  • %System%\SET4.tmp
  • %System%\SET6.tmp
  • %System%\SET8.tmp
  • %System%\SETA.tmp
  • %System%\SETC.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %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:

9.200

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
    • {D173E10A-001D-4318-9822-8C97A8418482}
  • In HKEY_CLASSES_ROOT\CLSID\{D173E10A-001D-4318-9822-8C97A8418482}
    • LocalServer32
  • In hkey_classes_root
    • {malware file name}.externalnshandler
  • In hkey_classes_root\{malware file name}.externalnshandler
    • clsid
  • In HKEY_CLASSES_ROOT\CLSID\{D173E10A-001D-4318-9822-8C97A8418482}
    • ProgID
  • In HKEY_CLASSES_ROOT\CLSID
    • {9C453F21-396D-11D5-9734-70E252C10127}
  • In HKEY_CLASSES_ROOT\CLSID\{9C453F21-396D-11D5-9734-70E252C10127}
    • LocalServer32
  • In hkey_classes_root
    • {malware file name}.ebooknshandler
  • In hkey_classes_root\{malware file name}.ebooknshandler
    • clsid
  • In HKEY_CLASSES_ROOT\CLSID\{9C453F21-396D-11D5-9734-70E252C10127}
    • ProgID
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent
    • Post Platform
  • 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.
  • %User Temp%\t011716120093000026458\{malware file name}.exe
  • %System%\SET1.tmp
  • %System%\SET3.tmp
  • %System%\SET5.tmp
  • %System%\SET7.tmp
  • %System%\SET9.tmp
  • %System%\SETB.tmp
  • %System%\SET2.tmp
  • %System%\SET4.tmp
  • %System%\SET6.tmp
  • %System%\SET8.tmp
  • %System%\SETA.tmp
  • %System%\SETC.tmp

Step 5

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.
  • %User Temp%\T011716120093000026458

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAM_0001229.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.

Step 7

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%\SET2.tmp
  • %System%\kbd101b.dll
  • %System%\SET4.tmp
  • %System%\kbd101c.dll
  • %System%\SET6.tmp
  • %System%\kbd103.dll
  • %System%\SET8.tmp
  • %System%\kbd106.dll
  • %System%\SETA.tmp
  • %System%\kbdjpn.dll
  • %System%\SETC.tmp
  • %System%\kbdkor.dll


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