This Trojan may be dropped by other malware.
It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.
Arrival Details
This Trojan may be dropped by the following malware:
Installation
This Trojan drops the following component file(s):
- %System Root%\Windows\System32\Tasks\GoogleUpdateTasksMachineUI ← scheduled task that executes malware every 3 minutes
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It uses the Windows Task Scheduler to add a scheduled task that executes the copies it drops.
It creates the following folders:
- %System Root%\Users\Public\Libraries\RecordedTV\dn
- %System Root%\Users\Public\Libraries\RecordedTV\tp
- %System Root%\Users\Public\Libraries\RecordedTV\up
- %System Root%\Users\Public\Libraries\RecordedTV
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Backdoor Routine
This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{random}.{BLOCKED}pdate.tk ← C&C communication
- http://{BLOCKED}pdate.tk/index.aspx?id={random}d ← for download
- http://{BLOCKED}pdate.tk/index.aspx?id={random}u ← for upload
Dropping Routine
This Trojan drops the following files:
- %System Root%\Users\Public\Libraries\RecordedTV\backup1.vbs ← executes DnE1.Ps1 and DnS1.Ps1
- %System Root%\Users\Public\Libraries\RecordedTV\DnE1.Ps1 ← download and upload execution (TROJ_HELMINTH.PS)
- %System Root%\Users\Public\Libraries\RecordedTV\DnS1.Ps1 ← C&C communicator (TROJ_HELMINTH.PS)
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other Details
This Trojan does the following:
- It sends a request to the remote URL to download a file which it executes on the machine. It then sends the results of the executed file back to the remote server.
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 TROJ_HELMINTH.PS. (Note: Please skip this step if the threat(s) listed below have already been removed.)
Step 3
Search and delete these folders
[ Learn More ]
[ back ]
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.
%System Root%\Users\Public\Libraries\RecordedTV\dn
%System Root%\Users\Public\Libraries\RecordedTV\tp
%System Root%\Users\Public\Libraries\RecordedTV\up
%System Root%\Users\Public\Libraries\RecordedTV
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:
%System Root%\Users\Public\Libraries\RecordedTV\dn
%System Root%\Users\Public\Libraries\RecordedTV\tp
%System Root%\Users\Public\Libraries\RecordedTV\up
%System Root%\Users\Public\Libraries\RecordedTV
- 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:
%System Root%\Users\Public\Libraries\RecordedTV\dn
%System Root%\Users\Public\Libraries\RecordedTV\tp
%System Root%\Users\Public\Libraries\RecordedTV\up
%System Root%\Users\Public\Libraries\RecordedTV
*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:
%System Root%\Users\Public\Libraries\RecordedTV\dn
%System Root%\Users\Public\Libraries\RecordedTV\tp
%System Root%\Users\Public\Libraries\RecordedTV\up
%System Root%\Users\Public\Libraries\RecordedTV
- Once located, select the file then press SHIFT+DELETE to permanently delete the folder.
- Repeat steps 2-3 for the remaining folders:
%System Root%\Users\Public\Libraries\RecordedTV\dn
%System Root%\Users\Public\Libraries\RecordedTV\tp
%System Root%\Users\Public\Libraries\RecordedTV\up
%System Root%\Users\Public\Libraries\RecordedTV
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 4
Search and delete this file
[ Learn More ]
[ back ]
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.
%System Root%\Users\Public\Libraries\RecordedTV\backup1.vbs
%System Root%\Users\Public\Libraries\RecordedTV\DnE1.Ps1
%System Root%\Users\Public\Libraries\RecordedTV\DnS1.Ps1
%System Root%\Windows\System32\Tasks\GoogleUpdateTasksMachineUI
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:
%System Root%\Users\Public\Libraries\RecordedTV\backup1.vbs
%System Root%\Users\Public\Libraries\RecordedTV\DnE1.Ps1
%System Root%\Users\Public\Libraries\RecordedTV\DnS1.Ps1
%System Root%\Windows\System32\Tasks\GoogleUpdateTasksMachineUI
- 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:
%System Root%\Users\Public\Libraries\RecordedTV\backup1.vbs
%System Root%\Users\Public\Libraries\RecordedTV\DnE1.Ps1
%System Root%\Users\Public\Libraries\RecordedTV\DnS1.Ps1
%System Root%\Windows\System32\Tasks\GoogleUpdateTasksMachineUI
- 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 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_HELMINTH.PS. 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.
