Downloader.Psyme

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Discovered: April 01, 2004
Updated: October 23, 2009 8:07:32 AM

Downloader.Psyme is a Trojan horse that downloads and executes a file using a known exploit of ADODB Stream objects in Microsoft Internet Explorer.

Antivirus Protection Dates

  • Initial Rapid Release version April 01, 2004
  • Latest Rapid Release version November 27, 2018 revision 008
  • Initial Daily Certified version April 01, 2004
  • Latest Daily Certified version November 27, 2018 revision 019
  • Initial Weekly Certified release date April 07, 2004

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Discovered: April 01, 2004
Updated: October 23, 2009 8:07:32 AM

When Downloader.Psyme runs, it may create the following file, which must be manually executed:
C:\Windows\test.hta.

Note: This function does not occur in all cases, however.

Next, the Trojan sends a GET request to a predetermined URL to download a file.
The GET request may be for any of the following:

  • [http://]solaris-maintenance.com/cur/[REMOVED]
  • [http://]solaris-maintenance.com/cur/mp.[REMOVED]
  • [http://]solaris-maintenance.com/cur/dp.[REMOVED]

The files may or may not be malicious.

Next, the Trojan creates an ADODB Stream object and executes the file(s).

The Trojan may attempt to save the file on the compromised computer.

Since the behavior of this threat varies, registry and start up information is also variable. In some versions, the following files are saved:
  • C:\Windows\m.exe
  • C:\Windows\mp.exe
  • C:\Windows\dp.exe
  • C:\Winnt\m.exe
  • C:\Winnt\mp.exe
  • C:\Winnt\dp.exe
  • C:\Windows\uninstl.exe

Note: The paths are hard-coded and not dependent on system variables. This behavior is specific to one instance of this Trojan and may change.

The Trojan may also try to send a confirmation to the download server that the file has been retrieved.

Discovered: April 01, 2004
Updated: October 23, 2009 8:07:32 AM

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Run a full system scan.

For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:

Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions.
    If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.

    If you use Norton AntiVirus 2005, Symantec AntiVirus Corporate Edition 9.0, or earlier products, LiveUpdate definitions are updated weekly. The exception is major outbreaks, when definitions are updated more often.
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them.

The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions . For detailed instructions read the document: How to update virus definition files using the Intelligent Updater .

3. To run a full system scan
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
    For Norton AntiVirus consumer products: Read the document: How to configure Norton AntiVirus to scan all files.

    For Symantec AntiVirus Enterprise products: Read the document: How to verify that a Symantec Corporate antivirus product is set to scan all files.
  2. Run a full system scan.
  3. If any files are detected, follow the instructions displayed by your antivirus program.
Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.
After the files are deleted, restart the computer in Normal mode.