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TROJ_DAWS.XVW

January 12, 2013
 ALIASES:

Trojan:Win32/Vundo.gen!AY (Microsoft); Generic Dropper!f2q (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.Daws.aulh (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 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:

74,752 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Jan 2013

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 Profile%\Application Data\VMware

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput

hkey_current_user\software\microsoft\
directinput\{malware file name}503f071200012400

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Blocked

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Blocked

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Cached

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Cached

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\ldagjcak

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\EXPLORER.EXE41107ECE000FC000

It adds the following registry entries:

hkey_current_user\software\microsoft\
directinput\{malware file name}503f071200012400
Name = "{malware file name}"

hkey_current_user\software\microsoft\
directinput\{malware file name}503f071200012400
UsesMapper = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Name = "{malware file name}"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Id = "{malware file name}503f071200012400"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Version = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
MostRecentStart = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{F4A6DBF6-DAEC-96B0-D346-CD2AB1DA7E65} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{F0A81A51-03C6-AFE8-5BF1-6B3DC2F8A33B} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{66B92122-0318-8177-B97A-188296D700C7} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{9540BEA8-5BD5-E305-E6C9-A9DD9BD54BF2} = "a25f57"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{58CDD01D-F9AF-641C-DBCA-A841E1E12001} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\
{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
{014140F0-630C-52FB-9AB4-B04F844CB7C3} = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\ldagjcak
DllName = "ldagjcak32.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\ldagjcak
Logon = "Logon"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\ldagjcak
Asynchronous = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\ldagjcak
Impersonate = "0"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\EXPLORER.EXE41107ECE000FC000
Name = "EXPLORER.EXE"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\EXPLORER.EXE41107ECE000FC000
UsesMapper = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Name = "EXPLORER.EXE"

HKEY_CURRENT_USER\Software\Microsoft\
DirectInput\MostRecentApplication
Id = "EXPLORER.EXE41107ECE000FC000"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Direct3D\MostRecentApplication
Name = "Explorer.EXE"

(Note: The default value data of the said registry entry is vfp6.exe.)

Dropping Routine

This Trojan drops the following files:

  • %System%\d3d8caps.dat
  • %System%\ldagjcak32.dll
  • %System%\d3d8caps.tmp

(Note: %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_CURRENT_USER\Software\Microsoft
    • DirectInput
  • In hkey_current_user\software\microsoft\directinput
    • {malware file name}503f071200012400
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput
    • MostRecentApplication
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Shell Extensions
    • Blocked
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Shell Extensions
    • Blocked
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Shell Extensions
    • Cached
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Shell Extensions
    • Cached
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}
    • {A62F1628-DA97-DBF5-706E-119BEA85B2F7}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify
    • ldagjcak
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput
    • EXPLORER.EXE41107ECE000FC000

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\directinput\{malware file name}503f071200012400
    • Name = "{malware file name}"
  • In hkey_current_user\software\microsoft\directinput\{malware file name}503f071200012400
    • UsesMapper = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • Name = "{malware file name}"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • Id = "{malware file name}503f071200012400"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • Version = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • MostRecentStart = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {F4A6DBF6-DAEC-96B0-D346-CD2AB1DA7E65} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {F0A81A51-03C6-AFE8-5BF1-6B3DC2F8A33B} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {66B92122-0318-8177-B97A-188296D700C7} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {9540BEA8-5BD5-E305-E6C9-A9DD9BD54BF2} = "a25f57"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {58CDD01D-F9AF-641C-DBCA-A841E1E12001} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\Approved\{9C99D989-604E-085E-DA32-A580DD74F57A}\{58884D7A-550B-B984-DF26-878C8835D246}\{A62F1628-DA97-DBF5-706E-119BEA85B2F7}
    • {014140F0-630C-52FB-9AB4-B04F844CB7C3} = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ldagjcak
    • DllName = "ldagjcak32.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ldagjcak
    • Logon = "Logon"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ldagjcak
    • Asynchronous = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ldagjcak
    • Impersonate = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\EXPLORER.EXE41107ECE000FC000
    • Name = "EXPLORER.EXE"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\EXPLORER.EXE41107ECE000FC000
    • UsesMapper = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • Name = "EXPLORER.EXE"
  • In HKEY_CURRENT_USER\Software\Microsoft\DirectInput\MostRecentApplication
    • Id = "EXPLORER.EXE41107ECE000FC000"

Step 4

Restore these modified registry values

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\MostRecentApplication
    • From: Name = "Explorer.EXE"
      To: Name = ""vfp6.exe""

Step 5

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.
  • %System%\d3d8caps.dat
  • %System%\ldagjcak32.dll
  • %System%\d3d8caps.tmp

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.
  • %User Profile%\Application Data\VMware

Step 7

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