TROJ_AGENT.LTG

October 12, 2012
 ALIASES:

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:

93,816 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 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.

Installation

This Trojan creates the following folders:

  • %Program Files%\WW2010CF

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SMRLogin = "%Program Files%\WW2010CF\hulogin.exe"

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\system\currentcontrolset\
services\Win-Win

Other System Modifications

This Trojan deletes the following files:

  • %Windows%\inf\ntfsf.sys
  • %Windows%\inf\ntfsf.inf
  • %Windows%\inf\ntfsf.PNF
  • %System%\Drivers\ntfsf.sys
  • %System Root%\temp\winet\ws2_32.dll
  • %System Root%\temp\winet\ws2help.dll
  • %System Root%\temp\winet\comctl32.dll
  • %Start Menu%\WiNet.lnk
  • %Program Files%\WW2010CF\rsensor.exe

(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.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\SMR\
Win-Win32

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\App Paths\
huwwin.exe

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
WiNet Client

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
DisplayName = "Win-Win Commander"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
ErrorControl = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
GUID = "f3556418-eb1c-4853-8871-8d1192c7087a"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
ImagePath = "%Program Files%\WW2010CF\SERVICES.EXE"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
InvenPort = "0405"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
LaunchMode = "System"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
License = "180270007700003001900006400360000140337220455"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
SensorUpdateVersion = "6.11.0725.01"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
SerialNumber = "121-5154653-TW9710"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
Type = "11"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Win-Win
Version = "6.11.0725.01"

HKEY_LOCAL_MACHINE\SOFTWARE\SMR\
Win-Win32
InstallPath = "%Program Files%\WW2010CF\huwwin.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\App Paths\
huwwin.exe
Path = "%Program Files%\WW2010CF"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WiNet Client
DisplayVersion = "6.11.0725.01"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WiNet Client
UninstallString = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WiNet Client
Winet = "WiNet Client"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\system\currentcontrolset\
control\safeboot\Minimal\
win-win\Service

HKEY_LOCAL_MACHINE\system\currentcontrolset\
control\safeboot\Network\
win-win\Service

HKEY_LOCAL_MACHINE\system\currentcontrolset\
Control\SafeBoot\Minimal\
ntfsf.sys

HKEY_LOCAL_MACHINE\system\currentcontrolset\
Control\SafeBoot\Network\
ntfsf.sys

HKEY_LOCAL_MACHINE\system\currentcontrolset\
services\ntfsf\Security

HKEY_LOCAL_MACHINE\system\currentcontrolset\
services\ntfsf\Enum

HKEY_LOCAL_MACHINE\system\currentcontrolset\
services\ntfsf

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\WW2010CFLinkFileCreate.txt
  • %System%\NMSAccessU.exe
  • %System%\rsensor.exe
  • %System%\pcinfo.exe
  • %System%\cpuz.sys
  • %System%\XceedCry.dll
  • %System%\NMSDVDXU.dll

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.)

This report is generated via an automated analysis system.

  SOLUTION

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

Restart in Safe Mode

[ Learn More ]

Step 3

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\services
    • Win-Win
  • In HKEY_LOCAL_MACHINE\Software\SMR
    • Win-Win32
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths
    • huwwin.exe
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • WiNet Client

Step 4

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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • SMRLogin = "%Program Files%\WW2010CF\hulogin.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • DisplayName = "Win-Win Commander"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • ErrorControl = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • GUID = "f3556418-eb1c-4853-8871-8d1192c7087a"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • ImagePath = "%Program Files%\WW2010CF\SERVICES.EXE"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • InvenPort = "0405"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • LaunchMode = "System"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • License = "180270007700003001900006400360000140337220455"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • SensorUpdateVersion = "6.11.0725.01"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • SerialNumber = "121-5154653-TW9710"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • Type = "11"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Win-Win
    • Version = "6.11.0725.01"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\SMR\Win-Win32
    • InstallPath = "%Program Files%\WW2010CF\huwwin.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\huwwin.exe
    • Path = "%Program Files%\WW2010CF"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WiNet Client
    • DisplayVersion = "6.11.0725.01"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WiNet Client
    • UninstallString = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WiNet Client
    • Winet = "WiNet Client"

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.
  • %Program Files%\WW2010CFLinkFileCreate.txt
  • %System%\NMSAccessU.exe
  • %System%\rsensor.exe
  • %System%\pcinfo.exe
  • %System%\cpuz.sys
  • %System%\XceedCry.dll
  • %System%\NMSDVDXU.dll

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.
  • %Program Files%\WW2010CF

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT.LTG. 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 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%\inf\ntfsf.sys
  • %Windows%\inf\ntfsf.inf
  • %Windows%\inf\ntfsf.PNF
  • %System%\Drivers\ntfsf.sys
  • %System Root%\temp\winet\ws2_32.dll
  • %System Root%\temp\winet\ws2help.dll
  • %System Root%\temp\winet\comctl32.dll
  • %Start Menu%\WiNet.lnk
  • %Program Files%\WW2010CF\rsensor.exe

Step 9

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\control\safeboot\Minimal\win-win
    • Service
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\control\safeboot\Network\win-win
    • Service
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\Control\SafeBoot\Minimal
    • ntfsf.sys
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\Control\SafeBoot\Network
    • ntfsf.sys
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\services\ntfsf
    • Security
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\services\ntfsf
    • Enum
  • In HKEY_LOCAL_MACHINE\system\currentcontrolset\services
    • ntfsf


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