TROJ_NITOL.DUKKX
DDoS:Win32/Nitol.B (Microsoft); Downloader (Symantec); HEUR:Trojan.Win32.Generic (Kaspersky); Troj/Nitol-R (Sophos); Trojan.Win32.Scar.aa (v) (Sunbelt); Trojan horse PSW.OnlineGames4.BBOB (AVG)
Windows
![](/vinfo/imgFiles/legend.jpg)
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
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 drops the following copies of itself into the affected system:
- %System%\hutpug.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\aspnet_states
Description = "Provides support for out-of-to-process"
Dropping Routine
This Trojan drops the following files:
- gei33.dll
- %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\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
- %Windows%\Help\Tours\mmTour\lpk.dll
(Note: %User Profile% is a user's profile folder, where it usually is C:\Documents and Settings\{user name} on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name} on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}0
This report is generated via an automated analysis system.
SOLUTION
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 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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\aspnet_states
- Description = "Provides support for out-of-to-process"
Step 3
Search and delete these components
- gei33.dll
- %User Profile%\{AC76BA86-7AD7-1033-7B44-AA0000000001}\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
- %Windows%\Help\Tours\mmTour\lpk.dll
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_NITOL.DUKKX. 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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