- 26 November 1996
- 13 February 2007
- Systems Affected:
Deltree Trojan attempts to use the Deltree program to delete all the files from the C drive.
Deltree Trojan usually replaces the contents of the Autoexec.bat file with this line:
deltree c: /y
If the Autoexec.bat file is run, which automatically happens each time you start a Windows 95/98/Me computer, the command deletes all the files on the C drive.
Antivirus Protection Dates
- Initial Rapid Release version 27 November 1996
- Latest Rapid Release version 07 May 2019 revision 006
- Initial Daily Certified version 27 November 1996
- Latest Daily Certified version 07 May 2019 revision 008
- Initial Weekly Certified release date 27 November 1996
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
- Update the virus definitions.
- Run a full system scan and delete all the files detected as Deltree Trojan. Replace the Autoexec.bat file if necessary.
For specific details on each of these procedures, read the following instructions.
1. Updating 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 the virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate), in the "Protection" section, at the top of this writeup.
- Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater), in the "Protection" section, at the top of this writeup.
The Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.
2. Scanning for and deleting the infected files
- 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."
- Run a full system scan.
- If any of the files are detected as infected with Deltree Trojan, click Delete.
- If you are using Windows 95/98/Me, and the Trojan overwrote the Autoexec.bat file, restore it from a clean backup.