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.
It may be downloaded by the following malware/grayware from remote sites:
Installation
This Trojan drops a copy of itself in the following folders using different file names:
- "%Application Data%\BackUp{Volume ID}.exe"
(Note: %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 drops the following file(s)/component(s):
- %User Temp%\L{Volume ID}
- %User Temp%\NTFS.sys
- %User Temp%\tmp{random characters}.tmp
- %System%\BOOT.dat
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It drops and executes the following files:
- %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll <- component responsible for downloading other ROVNIX components
(Note: %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:
- Global\INSNTFS{Volume ID}
- Global\UACNTFS{Volume ID}
- Global\BDNTFS{Volume ID}
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
BackUp{Volume ID} = "%Application Data%\BackUp{Volume ID}.exe"
It adds and runs the following services:
- Service Name: BS{Volume ID}
Display Name: BS{Volume ID}
Start Type: SERVICE_DEMAND_START
Binary Pathname: %User Temp%\NTFS.sys
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 registry entries to enable automatic execution of dropped component at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
RSA{Volume ID} = "%System%\rundll32.exe "%Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll",DllInitialize"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
LP = "%User temp%\L{Volume ID}"
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
ID = "-- default --"
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH1 = "{C&C server}"
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH2 = "{C&C server}"
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}
SH3 = "{C&C server}"
HKEY_CURRENT_USER\Software\Microsoft\
Installer\Products\B{Volume ID}\
PLUGIN
{CRC32 string} = "{Encrypted code of a binary file}"
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
Web Browser Home Page and Search Page Modification
This Trojan modifies the Internet Explorer Zone Settings.
Download Routine
This Trojan downloads an updated copy of itself from the following website(s):
- http://{BLOCKED}roke.com/17635908.zip
It connects to the following URL(s) to download its component file(s):
- http://{domain name}/download/{CRC32 String}32.zip
As of this writing, the said sites are inaccessible.
Other Details
This Trojan connects to the following website to send and receive information:
- http://{BLOCKED}roke.com/cgi-bin/240216/post.cgi
- http://{domain name}/login.asp
- http://{domain name}/images/transparent.gif
- http://{domain name}/images/pixel.gif
- http://{domain name}/images/logout.gif
- Where {domain name} can be any of the following:
- {BLOCKED}roke.com
- {BLOCKED}roke2.com
- {BLOCKED}roke3.com
- {BLOCKED}atlyhwq.onion
- {randomly generated domain}.ru
- {randomly generated domain}.com
- {randomly generated domain}.net
- {randomly generated domain}.biz
It checks for the presence of the following process(es):
It does the following:
- Can update C&C servers listed in registry
- Tries to modify the NTFS boot sector to save/load its encrypted code
- Checks if the Hard Disk is Protected and/or Encrypted by any of the following:
- BitLocker
- VeraCrypt
- TrueCrypt
- Terminates itself if the malware name and/or path has the following substrings:
- Makes use of certain vulnerabilities depending on the installation date of win32k.sys file
- This malware check if the DNS server does not contain the following strings:
- control
- sink
- hole
- dynadot
- block
- malw
- anti
- googl
- hack
- trojan
- abuse
- virus
- black
- spam
- It can use TOR service by accessing the following server:
- It connects to the following NTP server:
- 0.de.pool.ntp.org
- 0.lu.pool.ntp.org
- ntp1.stratum2.ru
- It creates named pipe\.\pipe\vhost{Volume ID}
It takes advantage of the following vulnerabilities:
- (MS13-053) Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (2850851)
- (MS14-058) Vulnerabilities in Kernel-Mode Driver Could Allow Remote Code Execution (3000061)
- (MS15-051) Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (3057191)
- (MS15-077) Vulnerability in ATM Font Driver Could Allow Elevation of Privilege (3077657)
However, as of this writing, the said sites are inaccessible.
It terminates itself if any of the following user name(s) are found in the affected system:
It gathers the following information and reports it to its servers:
- Malware ID
- Filepath and Name of the log file
- OS Version and Architecture
- File System
- Volume ID
- System Date and Time
- Child Process ID
- Child Filepath and Filename
- Parent Process ID
- Parent Filepath and Filename
- Current Malware Directory
- Username
- SID SubAuthority Level
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Remove malware/grayware files that dropped/downloaded TROJ_ROVNIX.PC. (Note: Please skip this step if the threats listed below have already been removed.)
Step 4
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 5
Disable this malware service
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Disabling a Malware Service
To disable a service:
- Open a command prompt window:
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type cmd in the text box provided, and press Enter.
» For Windows Vista, Windows 7, and Windows 2008 users, click the Start button, type cmd in the Search input field, and press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower left corner of the screen, click Command Prompt. - At the command prompt, type the following:
NET STOP BS{Volume ID} - Press Enter. A message should indicate that the service has been stopped successfully.
- Close the command prompt window.
Step 6
Delete this registry key
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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\Microsoft\Installer\Products
To delete the registry key this malware/grayware created:
- Open Registry Editor.
» 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, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Installer>Products - Still in the left panel, locate and delete the key:
B{Volume ID} - Close Registry Editor.
Step 7
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\Microsoft\Windows\CurrentVersion\Run
- RSA{Volume ID} = "%System%\rundll32.exe "%Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll",DllInitialize"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- BackUp{Volume ID} = "%Application Data%\BackUp{Volume ID}.exe"
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>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
RSA{Volume ID} = "%System%\rundll32.exe "%Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll",DllInitialize" - Again In the right panel, locate and delete the entry:
BackUp{Volume ID} = "%Application Data%\BackUp{Volume ID}.exe" - Close Registry Editor.
Step 8
Search and delete these files
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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 Temp%\L{Volume ID}
- %User Temp%\NTFS.sys
- %User Temp%\tmp{random characters}.tmp
- %System%\BOOT.dat
- %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll
To delete malware/grayware files:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the File name* input box, type
- %User Temp%\L{Volume ID}
- %User Temp%\NTFS.sys
- %User Temp%\tmp{random characters}.tmp
- %System%\BOOT.dat
- %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll
- 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.
- Repeat the said steps for all files listed.
*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 Temp%\L{Volume ID}
- %User Temp%\NTFS.sys
- %User Temp%\tmp{random characters}.tmp
- %System%\BOOT.dat
- %Application Data%\Microsoft\Crypto\RSA\RSA{Volume ID}.dll
- Once located, select the file then press SHIFT+DELETE to delete it.
- Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ROVNIX.PC. 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 10
Reset Internet security settings
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To reset Internet security settings:
- Close all Internet browser windows.
- Open Control Panel. To do this:
• On Windows 2000
Click Start>Settings>Control Panel
• On Windows XP, Server 2003, Vista, and 7
Click Start>Control Panel - Double-click Internet Options.
- In the Internet Properties window, click the Security tab.
- For each Web content zone, click on the Default Level button to set each zone to the default setting.
- Click OK.
Step 11
Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.
NOTES:
For Trend Micro product users, use the ATTK with ATRT to restore the modified Initial Program Loader (IPL) of an active NTFS partition.
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