Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

VBS.Sunfl

VBS.Sunfl

Discovered:
18 June 2002
Updated:
13 February 2007
Also Known As:
VBS/Sunflower.trojan

VBS.Sunfl is a Trojan horse that is written in VBScript. When it is executed, VBS.Sunfl checks the current time. If it is 56 seconds or less of every minute, VBS.Sunfl attempts to delete all files from C:\Windows\Desktop.

Antivirus Protection Dates

  • Initial Rapid Release version 18 June 2002
  • Latest Rapid Release version 28 September 2010 revision 054
  • Initial Daily Certified version 18 June 2002
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 19 June 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

To remove this Trojan, update the virus definitions, run a full system scan, and delete all files that are detected as VBS.Sunfl. For details on how to do this, read the following instructions.

To scan with Norton AntiVirus and delete the infected files:
  1. Obtain the most recent virus definitions. There are two ways to do this:
    • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions have undergone full quality assurance testing by Symantec Security Response and are posted to the LiveUpdate servers one time each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
    • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions have undergone full quality assurance testing by Symantec Security Response. They are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

      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. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files.
  3. Run a full system scan.
  4. Delete all files that NAV detects as VBS.Sunfl.


Writeup By: Kaoru Hayashi