This malware is one of the variants/components of RETADUP malware discovered on September 2017 to be hitting users in South America for purposes of cryptocurrency mining. Users infected by this malware may find malicous behaviors being exhibited upon their system.
This Worm may be dropped by other malware.
It is a component of other malware.
Arrival Details
This Worm may be dropped by the following malware:
Installation
This Worm creates the following folders:
It is a component of other malware.
Other System Modifications
This Worm adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt""
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.exe"
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt""
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.exe"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0
(Note: The default value data of the said registry entry is 1.)
Other Details
This Worm does the following:
- This is a malicious AutoIt script (AU3) used by other malware for its routines. It requires its component files to execute properly.
NOTES:
This worm drops the following files on removable drives:
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AntiShortCut.lnk
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AntiUsb.exe
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AntiUsbShortCut.zip
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AntiUsbShortCut.lnk
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AntiUsbWorm.zip
- {Drive}:\AntiUsbShortCut\AntiUsbShortCut\AutoIt3.exe
- {Drive}:\{folder}\Downloads.lnk
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
Remove the malware/grayware file dropped/downloaded by WORM_RETADUP.D. (Note: Please skip this step if the threat(s) listed below have already been removed.)
Step 3
Identify and terminate files detected as WORM_RETADUP.D
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- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
To terminate the malware/grayware/spyware process:
- Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
- Open Windows Task Manager. To do this, press CTRL+SHIFT+ESC.
- View the list of all running programs. To do this:
• For Windows 2000, XP, Server 2003, Vista, 7 and Server 2008 users, click the Processes tab.
• For Windows 8, 8.1 and Server 2012 users, click the Details tab. - In the list of running programs, locate a malware/grayware/spyware file detected earlier.
- Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
- Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
- To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
Step 4
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
- CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt""
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.exe"
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt""
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.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:
CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt"" - Again In the right panel, locate and delete the entry:
Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.exe" - In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>CurrentVersion>Run - In the right panel, locate and delete the entry:
CpuOptimizer = "C:\newcpuspeed\Cpufix.exe "C:\newcpuspeed\cpuage.tnt"" - Again In the right panel, locate and delete the entry:
Checkcpu = "C:\Windows\system32\cmd.exe /c start C:\newcpuspeed\Cpufix.exe" - Close Registry Editor.
Step 5
Restore this modified 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\Explorer\Advanced
- From: ShowSuperHidden = 0
To: ShowSuperHidden = 1
To restore the registry value this malware/grayware modified:
- 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>Windows>CurrentVersion>Explorer>Advanced - In the right panel, locate the registry value:
ShowSuperHidden = 0 - Right-click on the value name and choose Modify. Change the value data of this entry to:
ShowSuperHidden = 1 - Close Registry Editor.
Step 6
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. {Drive}:\AntiUsbShortCut\
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:
{Drive}:\AntiUsbShortCut\
- 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:
{Drive}:\AntiUsbShortCut\
*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:
{Drive}:\AntiUsbShortCut\ - Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
{Drive}:\AntiUsbShortCut\
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_RETADUP.D. 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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