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BKDR_ZEGOST.NY

October 23, 2013
 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:

180,240 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Oct 2013

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:

  • %Start Menu%\Programs\Startupÿ

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

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\BITS
InitTime = "20131011"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\BITS
Version = "Vip1.0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\BITS
Group = "ĬÈÏ·Ö×é"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Distribuixr
Description = "Distribuxkt Transaction Coordinator Service."

Dropping Routine

This backdoor drops the following files:

  • dd0s_dap.exe
  • hra1355640.dll
  • hra33.dll
  • %System%\360.exe
  • %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\lpk.dll
  • %Temporary Internet Files%\Content.IE5\ZDGZNKA5\lpk.dll
  • %Program Files%\Adobe\Reader 10.0\Reader\lpk.dll
  • %Program Files%\Common Files\Adobe\ARM\1.0\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\DW\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\Speech\lpk.dll
  • %Program Files%\Internet Explorer\Connection Wizard\lpk.dll
  • %Program Files%\Internet Explorer\lpk.dll
  • %Program Files%\Messenger\lpk.dll
  • %Program Files%\Movie Maker\lpk.dll
  • %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\lpk.dll
  • %Program Files%\MSN\MSNCoreFiles\Install\lpk.dll
  • %Program Files%\MSN Gaming Zone\Windows\lpk.dll
  • %Program Files%\NetMeeting\lpk.dll
  • %Program Files%\Outlook Express\lpk.dll
  • %Program Files%\Windows Media Player\lpk.dll
  • %Program Files%\Windows NT\Accessories\lpk.dll
  • %Program Files%\Windows NT\lpk.dll
  • %Program Files%\Windows NT\Pinball\lpk.dll
  • %Program Files%\WinPcap\lpk.dll
  • %Windows%\$MSI31Uninstall_KB893803v2$\lpk.dll
  • %Windows%\$MSI31Uninstall_KB893803v2$\spuninst\lpk.dll
  • %Windows%\$NtUninstallWIC$\spuninst\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\ComSvcConfig\bb3c2f59a821abc54f420f3a9e051d6a\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\dfsvc\837fe02bdcf637d5bf1e5ffb935ebb80\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\MSBuild\aa99ebdd26e5d493fec18b1714458782\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\PresentationFontCac#\4ce7fd62d4107fbe996ab305eb21ee6a\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\ServiceModelReg\feac66e81309d67b48f7a9f4cb98f7c8\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\SMSvcHost\a098c66aa40d958878f3f5344e6ae1a4\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\WsatConfig\13f498f606b7cb97c086eea149b8c872\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\ComSvcConfig\51819c709096229ee187a7feee395d9f\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\dfsvc\b9b6069e6da06eb57e89cc544397f735\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\Microsoft.Workflow.#\6a8da5dd61b1fcfed27f84047a3e2bad\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\MSBuild\aa25092606e5e9826db7a7bd0adb9b2b\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\SMSvcHost\38f0d77629891e7808424103aaef0728\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\WsatConfig\3c0d21e75c9a48aba6fba3ddff0fcf39\lpk.dll
  • %Windows%\lpk.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %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.. %Temporary Internet Files% is the Temporary Internet Files folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista and 7.. %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).. %Windows% is the Windows folder, which is usually C:\Windows.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.45.242:8080/dd0s_dap.exe

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\BITS
    • InitTime = "20131011"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\BITS
    • Version = "Vip1.0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\BITS
    • Group = "ĬÈÏ·Ö×é"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Distribuixr
    • Description = "Distribuxkt Transaction Coordinator Service."

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.
  • dd0s_dap.exe
  • hra1355640.dll
  • hra33.dll
  • %System%\360.exe
  • %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\lpk.dll
  • %Temporary Internet Files%\Content.IE5\ZDGZNKA5\lpk.dll
  • %Program Files%\Adobe\Reader 10.0\Reader\lpk.dll
  • %Program Files%\Common Files\Adobe\ARM\1.0\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\DW\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\lpk.dll
  • %Program Files%\Common Files\Microsoft Shared\Speech\lpk.dll
  • %Program Files%\Internet Explorer\Connection Wizard\lpk.dll
  • %Program Files%\Internet Explorer\lpk.dll
  • %Program Files%\Messenger\lpk.dll
  • %Program Files%\Movie Maker\lpk.dll
  • %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\lpk.dll
  • %Program Files%\MSN\MSNCoreFiles\Install\lpk.dll
  • %Program Files%\MSN Gaming Zone\Windows\lpk.dll
  • %Program Files%\NetMeeting\lpk.dll
  • %Program Files%\Outlook Express\lpk.dll
  • %Program Files%\Windows Media Player\lpk.dll
  • %Program Files%\Windows NT\Accessories\lpk.dll
  • %Program Files%\Windows NT\lpk.dll
  • %Program Files%\Windows NT\Pinball\lpk.dll
  • %Program Files%\WinPcap\lpk.dll
  • %Windows%\$MSI31Uninstall_KB893803v2$\lpk.dll
  • %Windows%\$MSI31Uninstall_KB893803v2$\spuninst\lpk.dll
  • %Windows%\$NtUninstallWIC$\spuninst\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\ComSvcConfig\bb3c2f59a821abc54f420f3a9e051d6a\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\dfsvc\837fe02bdcf637d5bf1e5ffb935ebb80\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\MSBuild\aa99ebdd26e5d493fec18b1714458782\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\PresentationFontCac#\4ce7fd62d4107fbe996ab305eb21ee6a\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\ServiceModelReg\feac66e81309d67b48f7a9f4cb98f7c8\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\SMSvcHost\a098c66aa40d958878f3f5344e6ae1a4\lpk.dll
  • %Windows%\assembly\NativeImages_v2.0.50727_32\WsatConfig\13f498f606b7cb97c086eea149b8c872\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\ComSvcConfig\51819c709096229ee187a7feee395d9f\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\dfsvc\b9b6069e6da06eb57e89cc544397f735\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\Microsoft.Workflow.#\6a8da5dd61b1fcfed27f84047a3e2bad\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\MSBuild\aa25092606e5e9826db7a7bd0adb9b2b\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\SMSvcHost\38f0d77629891e7808424103aaef0728\lpk.dll
  • %Windows%\assembly\NativeImages_v4.0.30319_32\WsatConfig\3c0d21e75c9a48aba6fba3ddff0fcf39\lpk.dll
  • %Windows%\lpk.dll

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.
  • %Start Menu%\Programs\Startupÿ

Step 6

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