TROJ_DLOADER.RLE

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.

It modifies files, disabling programs and applications from properly running.

File Size:

257,592 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Apr 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.

Other System Modifications

This Trojan modifies the following files:

%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

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%\SET3.tmp
%System%\kbd101b.dll
%System%\SET5.tmp
%System%\kbd101c.dll
%System%\SET7.tmp
%System%\kbd103.dll
%System%\SET9.tmp
%System%\kbd106.dll
%System%\SETB.tmp
%System%\kbdjpn.dll
%System%\SETD.tmp
%System%\kbdkor.dll
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

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

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Health\{672E13CD-CE63-4AAC-BFC6-3C55948970C9}

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
MMS

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
HTTP

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
RTSP

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"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
UniqueID = "{56F94BF6-15E5-4D18-80F0-B0A5E64F6871}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
ComputerName = "BRIAN-75445F269"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
VolumeSerialNumber = "fbdff95"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
MMS
ProxyStyle = "0"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
MMS
ProxyPort = "6db"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
MMS
ProxyBypass = "0"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
HTTP
ProxyStyle = "1"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
HTTP
ProxyPort = "5"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
HTTP
ProxyBypass = "0"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
RTSP
ProxyStyle = "0"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
RTSP
ProxyPort = "22a"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings\
RTSP
ProxyBypass = "0"

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Player\Tasks\
NowPlaying
InitFlags = "1"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\Namespace
LocalBase = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.XML.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\Namespace
DTDFile = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.DTD.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\Namespace
LocalDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSD.XML"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSD.XML.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\Namespace
RemoteDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML"

(Note: The default value data of the said registry entry is %System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSR.XML.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "iexplore.exe"

(Note: The default value data of the said registry entry is iexplore.exe.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "4117b81"

(Note: The default value data of the said registry entry is 41107b81.)

Dropping Routine

This Trojan drops the following files:

%User Temp%\aut1.tmp
%Temp%\548142.bat
%System%\SET2.tmp
%System%\SET4.tmp
%System%\SET6.tmp
%System%\SET8.tmp
%System%\SETA.tmp
%System%\SETC.tmp
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.bak
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.done
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSD.XML
%System%\SET3.tmp
%System%\SET5.tmp
%System%\SET7.tmp
%System%\SET9.tmp
%System%\SETB.tmp
%System%\SETD.tmp
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML

(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.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)

This report is generated via an automated analysis system.

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

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_CURRENT_USER\Software\Microsoft\Internet Explorer\International
- CpMRU

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Health
- {672E13CD-CE63-4AAC-BFC6-3C55948970C9}

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences
- ProxySettings

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings
- MMS

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings
- HTTP

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings
- RTSP

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"

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
- UniqueID = "{56F94BF6-15E5-4D18-80F0-B0A5E64F6871}"

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
- ComputerName = "BRIAN-75445F269"

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
- VolumeSerialNumber = "fbdff95"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\MMS
- ProxyStyle = "0"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\MMS
- ProxyPort = "6db"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\MMS
- ProxyBypass = "0"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\HTTP
- ProxyStyle = "1"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\HTTP
- ProxyPort = "5"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\HTTP
- ProxyBypass = "0"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\RTSP
- ProxyStyle = "0"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\RTSP
- ProxyPort = "22a"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences\ProxySettings\RTSP
- ProxyBypass = "0"

In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Player\Tasks\NowPlaying
- InitFlags = "1"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Internet Explorer>International>CpMRU
In the right panel, locate and delete the entry:
Enable = "1"
Again In the right panel, locate and delete the entry:
Size = "a"
Again In the right panel, locate and delete the entry:
InitHits = "64"
Again In the right panel, locate and delete the entry:
Factor = "14"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Internet Explorer>International
In the right panel, locate and delete the entry:
W2KLpk = "1"
Again In the right panel, locate and delete the entry:
W2KLpk = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows Media>WMSDK>General
In the right panel, locate and delete the entry:
UniqueID = "{56F94BF6-15E5-4D18-80F0-B0A5E64F6871}"
Again In the right panel, locate and delete the entry:
ComputerName = "BRIAN-75445F269"
Again In the right panel, locate and delete the entry:
VolumeSerialNumber = "fbdff95"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>MediaPlayer>Preferences>ProxySettings>MMS
In the right panel, locate and delete the entry:
ProxyStyle = "0"
Again In the right panel, locate and delete the entry:
ProxyPort = "6db"
Again In the right panel, locate and delete the entry:
ProxyBypass = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>MediaPlayer>Preferences>ProxySettings>HTTP
In the right panel, locate and delete the entry:
ProxyStyle = "1"
Again In the right panel, locate and delete the entry:
ProxyPort = "5"
Again In the right panel, locate and delete the entry:
ProxyBypass = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>MediaPlayer>Preferences>ProxySettings>RTSP
In the right panel, locate and delete the entry:
ProxyStyle = "0"
Again In the right panel, locate and delete the entry:
ProxyPort = "22a"
Again In the right panel, locate and delete the entry:
ProxyBypass = "0"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>MediaPlayer>Player>Tasks>NowPlaying
In the right panel, locate and delete the entry:
InitFlags = "1"
Close Registry Editor.

Step 4

Restore this modified 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\Windows Media\WMSDK\Namespace
- From: LocalBase = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML"
  To: LocalBase = ""%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.XML""

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\Namespace
- From: DTDFile = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD"
  To: DTDFile = ""%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.DTD""

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\Namespace
- From: LocalDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSD.XML"
  To: LocalDelta = ""%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSD.XML""

In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\Namespace
- From: RemoteDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML"
  To: RemoteDelta = ""%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSR.XML""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name = "iexplore.exe"
  To: Name = ""iexplore.exe""

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "4117b81"
  To: ID = ""41107b81""

To restore the registry value this malware/grayware/spyware modified:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows Media>WMSDK>Namespace
In the right panel, locate the registry value:
LocalBase = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML"
Right-click on the value name and choose Modify. Change the value data of this entry to:
LocalBase = "%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.XML"
Again In the right panel, locate the registry value:
DTDFile = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD"
Right-click on the value name and choose Modify. Change the value data of this entry to:
DTDFile = "%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNS.DTD"
Again In the right panel, locate the registry value:
LocalDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSD.XML"
Right-click on the value name and choose Modify. Change the value data of this entry to:
LocalDelta = "%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSD.XML"
Again In the right panel, locate the registry value:
RemoteDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML"
Right-click on the value name and choose Modify. Change the value data of this entry to:
RemoteDelta = "%System Root%\Documents and Settings\Default User\Local Settings\Application Data\Microsoft\Windows Media\9.0\WMSDKNSR.XML"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>DirectDraw>MostRecentApplication
In the right panel, locate the registry value:
Name = "iexplore.exe"
Right-click on the value name and choose Modify. Change the value data of this entry to:
Name = "iexplore.exe"
Again In the right panel, locate the registry value:
ID = "4117b81"
Right-click on the value name and choose Modify. Change the value data of this entry to:
ID = "41107b81"
Close Registry Editor.

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.

%User Temp%\aut1.tmp
%Temp%\548142.bat
%System%\SET2.tmp
%System%\SET4.tmp
%System%\SET6.tmp
%System%\SET8.tmp
%System%\SETA.tmp
%System%\SETC.tmp
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.bak
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML.done
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSD.XML
%System%\SET3.tmp
%System%\SET5.tmp
%System%\SET7.tmp
%System%\SET9.tmp
%System%\SETB.tmp
%System%\SETD.tmp
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML

Step 6

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

%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.DTD

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%\SET3.tmp
%System%\kbd101b.dll
%System%\SET5.tmp
%System%\kbd101c.dll
%System%\SET7.tmp
%System%\kbd103.dll
%System%\SET9.tmp
%System%\kbd106.dll
%System%\SETB.tmp
%System%\kbdjpn.dll
%System%\SETD.tmp
%System%\kbdkor.dll
%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML

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