- 16 January 2003
- 13 February 2007
- Systems Affected:
VBS.Lorena@mm is a VBScript worm that:
- Sends itself to all the contacts in the Windows Address Book
- Copies itself to the shared directory of several popular P2P applications
- Copies itself to all the directories on all the fixed and network drives
- Sends itself, via mIRC, when somebody joins a channel.
- Deletes the antivirus software and all the files in all the directories on certain dates
Antivirus Protection Dates
- Initial Rapid Release version 17 January 2003
- Latest Rapid Release version 28 September 2010 revision 054
- Initial Daily Certified version 17 January 2003
- Latest Daily Certified version 28 September 2010 revision 036
- Initial Weekly Certified release date 22 January 2003
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 VBS.Lorena@mm.
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 files are detected as infected with VBS.Lorena@mm, click Delete.