Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This backdoor drops the following copies of itself into the affected system:
- %Program Files%\Client\client.exe
- %Application Data%\snIkvN\NuPMBqE.exe
(Note: %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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)
It creates the following folders:
- %Program Files%\Client
- %Application Data%\Monitor
- %Application Data%\snIkvN
- %Application Data%\Monitor\Guard - folder contains guarded files
- %Application Data%\Monitor\Files
- %Application Data%\Monitor\Logs - folder contains logs of keystrokes
(Note: %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.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- 876b970b6b938534675fdebe39b6948b24d6f747
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Client Monitor = ""%Program Files%\Client\client.exe" -a /a"
It modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "userinit.exe,"%System32%\clientmonitor.exe""
(Note: The default value data of the said registry entry is "%System32%\userinit.exe,".)
It drops the following file(s) in the Windows Startup folder to enable its automatic execution at every system startup:
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software
0fnZPygE/xR18opOuVMNiA== = "Brtd5eYVR7zBqijN/kc78ixSTesL9ZGhYmLqDCNpQQA="
HKEY_CURRENT_USER\Software
nADA6whF94H9ViNW8oPeIQ== = "XPNE34f/sM/V88cCFJiPo6ucrxg3ivCjOolL+sjGUGg="
HKEY_CURRENT_USER\Software
PTH = "%Program Files%\Client\client.exe"
HKEY_CURRENT_USER\Software
MTX = "876b970b6b938534675fdebe39b6948b24d6f747"
HKEY_CURRENT_USER\Software
PRC = "3012"
Backdoor Routine
This backdoor connects to the following websites to send and receive information:
- {BLOCKED}rondavies.ddns.net:6262
Other Details
This backdoor does the following:
- This backdoor is capable of the following:
- DDOS Attack
- Create/Kill Process
- Kill/Update Bot
- Create/Modify/Delete Files
- Create/Modify/Delete Directories
- Download/Upload Files
- Execute Files
- Start/Stop Shell
- Guard Files
- Log Keystroke
- Record Audio
- Record Camera/Webcam
- Send Emails
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
Restart in Safe Mode
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To restart in Safe Mode:
• For Windows 2000 users
- Restart your computer.
- Press F8 when you see the Starting Windows bar at the bottom of the screen.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows XP users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Windows Advanced Options menu does not appear, try restarting then pressing F8 several times when the POST screen appears.
- Choose the Safe Mode option from the Windows Advanced Options menu then press Enter.
• For Windows Server 2003 users
- Restart your computer.
- Press F8 after Windows starts up. If the Windows Advanced Options menu does not appear, try restarting again and pressing F8 several times afterward.
- On the Windows Advanced Option menu, use the arrow keys to select Safe Mode then press Enter.
• For Windows Vista, Windows 7, and Windows Server 2008 users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
- On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.
• For Windows 8, Windows 8.1, and Windows Server 2012 users
- Access the Charms bar by moving your mouse pointer to the upper right corner of the screen.
- Move your mouse pointer down and click Settings>Change your PC Settings.
- In the left panel, click General.
- In the right panel, scroll down to the bottom to find the Advanced startup section, then click the Restart now button and wait for the system to restart.
- In the Advanced Startup menu, click Troubleshoot>Advanced Options>Startup Settings>Restart and wait for the system to restart.
- In the Startup Settings menu, press 4 to enable safe mode.
Step 3
Delete this registry value
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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
- 0fnZPygE/xR18opOuVMNiA = = = "Brtd5eYVR7zBqijN/kc78ixSTesL9ZGhYmLqDCNpQQA="
- In HKEY_CURRENT_USER\Software
- nADA6whF94H9ViNW8oPeIQ = = = "XPNE34f/sM/V88cCFJiPo6ucrxg3ivCjOolL+sjGUGg="
- In HKEY_CURRENT_USER\Software
- PTH = "%Program Files%\Client\client.exe"
- In HKEY_CURRENT_USER\Software
- MTX = "876b970b6b938534675fdebe39b6948b24d6f747"
- In HKEY_CURRENT_USER\Software
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- Client Monitor = ""%Program Files%\Client\client.exe" -a /a"
To delete the registry value this malware created:
- Open Registry Editor. To do this:
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter. - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software - In the right panel, locate and delete the entry:
0fnZPygE/xR18opOuVMNiA = = = "Brtd5eYVR7zBqijN/kc78ixSTesL9ZGhYmLqDCNpQQA=" - Again In the right panel, locate and delete the entry:
nADA6whF94H9ViNW8oPeIQ = = = "XPNE34f/sM/V88cCFJiPo6ucrxg3ivCjOolL+sjGUGg=" - Again In the right panel, locate and delete the entry:
PTH = "%Program Files%\Client\client.exe" - Again In the right panel, locate and delete the entry:
MTX = "876b970b6b938534675fdebe39b6948b24d6f747" - Again In the right panel, locate and delete the entry:
PRC = "3012" - In the left panel of the Registry Editor window, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>RunOnce - In the right panel, locate and delete the entry:
Client Monitor = ""%Program Files%\Client\client.exe" -a /a" - Close Registry Editor.
Step 4
Restore these modified registry values
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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\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "userinit.exe,"%System32%\clientmonitor.exe""
To: Userinit = "%System32%\userinit.exe,"
To restore registry values this malware/grayware modified:
- Open Registry Editor. To do this:
- On Windows 2000, XP, and Server 2003:
Click Start>Run, type REGEDIT in the text box provided, and then press Enter. - On Windows Vista, 7, and Server 2008:
Click the Start button, type REGEDIT in the Search input field then press Enter. - On Windows 8, 8.1, and Server 2012:
Right-click on the lower left corner of the screen and click Run, type REGEDIT in the Run input field, and then press Enter.
- In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Winlogon - In the right panel, locate the registry value:
Userinit = "userinit.exe,"%System32%\clientmonitor.exe"" - Right-click on the value name and choose Modify. Change the value data of this entry to:
Userinit = "%System32%\userinit.exe," - Close Registry Editor.
Step 5
Search and delete these folders
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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%\Client
%Application Data%\Monitor
%Application Data%\snIkvN
%Application Data%\Monitor\Guard
%Application Data%\Monitor\Files
%Application Data%\Monitor\Logs
To delete malware/grayware/spyware folders:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the File name* input box, type:
%Program Files%\Client
%Application Data%\Monitor
%Application Data%\snIkvN
%Application Data%\Monitor\Guard
%Application Data%\Monitor\Files
%Application Data%\Monitor\Logs
- In the Look In drop-down list, select My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2 to 4 for the remaining folders:
%Program Files%\Client
%Application Data%\Monitor
%Application Data%\snIkvN
%Application Data%\Monitor\Guard
%Application Data%\Monitor\Files
%Application Data%\Monitor\Logs
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
%Program Files%\Client
%Application Data%\Monitor
%Application Data%\snIkvN
%Application Data%\Monitor\Guard
%Application Data%\Monitor\Files
%Application Data%\Monitor\Logs
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
%Program Files%\Client
%Application Data%\Monitor
%Application Data%\snIkvN
%Application Data%\Monitor\Guard
%Application Data%\Monitor\Files
%Application Data%\Monitor\Logs
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 6
Search and delete this file
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There may be some 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. %User Startup%\tIlpT.lnk
To manually delete a malware/grayware file from an affected system:
• For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type the following:
%User Startup%\tIlpT.lnk - In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
%User Startup%\tIlpT.lnk - Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_LUMINOSITY.Y. 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.
