TROJ_ATRAPS.CW
Trojan:Win32/Agent.GZ (Microsoft); Downloader (Symantec); Trojan-Downloader.Win32.Small.aokj (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.2894095 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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.
It modifies files, disabling programs and applications from properly running.
TECHNICAL DETAILS
27,648 bytes
EXE
No
29 Dec 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:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It deletes the following files:
- %Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Health\{A1E7BF5C-7957-4E48-9F7E-8E3B62340DCE}
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\
Windows Media\WMSDK\General
UniqueID = "{40DAD82F-A7CC-4056-B645-4DA7EC055D0C}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
ComputerName = "WILBERT-347F83C"
HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
VolumeSerialNumber = "68adfd"
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.)
Dropping Routine
This Trojan drops the following files:
- %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
- %Application Data%\Microsoft\Windows Media\9.0\WMSDKNS.XML
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
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
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\MediaPlayer\Health
- {A1E7BF5C-7957-4E48-9F7E-8E3B62340DCE}
- 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
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\General
- UniqueID = "{40DAD82F-A7CC-4056-B645-4DA7EC055D0C}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
- ComputerName = "WILBERT-347F83C"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
- VolumeSerialNumber = "68adfd"
- 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"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out 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""
- From: LocalBase = "%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""
- From: DTDFile = "%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""
- From: LocalDelta = "%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""
- From: RemoteDelta = "%Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML"
Step 5
Search and delete these components
- %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
- %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_ATRAPS.CW. 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.
- %Application Data%\Microsoft\Windows Media\9.0\WMSDKNSR.XML
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