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- **********************************************************************
- ** **
- ** Special Information about Unique Computer Viruses VIRSPEC.TXT **
- ** **
- ** Symantec AntiVirus Research Center (SARC) October 1, 1996 **
- ** **
- **********************************************************************
-
-
- * General Information
- * Adding Program File extensions to Detect/Repair Excel Viruses
- * Microsoft Word Macro Viruses
- * Disappearing Hard Drives
-
-
- **********************************************************************
- ** General Information **
- **********************************************************************
- Please read the OCT96.TXT file included with this update. It contains
- a detailed list of the new virus definitions and a summary of current
- virus activity around the world.
-
-
- **********************************************************************
- ** Adding Program File Extensions to Detect/Repair Excel Viruses **
- **********************************************************************
- In order for NAV (all versions and platforms) to detect and repair the
- XM.Laroux virus, you must add ".XL?" to the program files extension
- list. Without this addition, NAV will ignore all Excel spreadsheets and
- not report infections.
-
- Detailed instructions on making the additions are available in the NAV
- User's Guides.
-
- Norton AntiVirus 3.0
- Chapter 8, Customizing Virus Checking, "Adding Program File
- Extensions"
-
- Norton AntiVirus 95
- Chapter 10, Customizing scanning, "Specifying program file
- Extensions"
-
- Norton AntiVirus Scanner for Windows NT
- Chapter 6, Customizing Norton AntiVirus, "Specifying program file
- Extensions"
-
- Norton AntiVirus for NetWare 2.0
- Chapter 6, Defining Program Files and Extension, "Protecting Program
- Files"
-
- **********************************************************************
- ** Microsoft Word Macro Viruses **
- **********************************************************************
- Macro viruses use the WordBasic macro language to infect and, in some
- cases, implant binary viruses into host programs. Currently, there
- are several known macro viruses: Concept is the most widespread.
-
- Macro viruses reside within Microsoft Word document and template
- files. Notably, macro viruses are platform-independent. They can
- infect documents and templates on the DOS, Windows, Window 95,
- Windows NT, and Mac operating systems.
-
- All current versions of Norton AntiVirus detect and eliminate the
- macro viruses.
-
- If your installed version of Norton AntiVirus 3.0 (NAV.EXE or
- NAVW.EXE) is dated earlier than February 23, 1996, or your installed
- version of Norton AntiVirus for Windows 95 (NAVW32.EXE) is dated
- earlier than December 1, 1995, you need to upgrade. The Norton
- AntiVirus upgrade installs the NAV Macro Engine automatically, which
- detects and eliminates macro viruses.
-
- To upgrade your Norton AntiVirus 3.0 program:
-
- * Download the file called UPDATEME.EXE
- * Place the file in an empty directory and execute the file
- to extract.
-
- To upgrade your Norton AntiVirus for Windows 95 program:
-
- * Download the file called NAV95PCH.EXE
- * Place the file in an empty folder and execute the file
- to extract.
-
- Step-by-step instructions are included with each file. If you
- need additional instructions, a FaxBack service is available
- at (541) 984-2490 to assist you.
-
- UPDATEME.EXE and NAV95PCH.EXE are located where the monthly virus
- definitions files update are normally found. It is available for
- download from the Symantec BBS, the Symantec FTP or Web sites,
- CompuServe, America Online, or Microsoft Network. You can also call
- Customer Service at (800) 441-7234 to order a disk set.
-
- **********************************************************************
- ** Disappearing Hard Drives **
- **********************************************************************
- Several viruses, such as Frankenstein and Stoned.Empire.Monkey, cause
- your hard disk to "disappear" when booting from a clean floppy disk.
- This occurs because the virus either encrypts or relocates the hard
- disk partition table (a vital part of the disk's system area).
-
- All "appears" well when you boot from your hard disk because the
- virus actives in memory and tells DOS where the partition table is
- relocated, or acts as the partition table itself. If you boot clean,
- DOS can't find the partition table and the virus isn't around to give
- directions. You may receive an "Invalid drive specification" or
- similar error when trying to access the hard disk.
-
- When you boot clean so NAV can repair such an infection, the hard
- disk will not appear in the drive list. Don't worry! NAV, with the
- default options enabled, will bypass DOS and look directly at the
- hard disk to check the system area for infection, no matter what you
- scan. For example, scanning a floppy disk will scan memory, the
- floppy disk, and the system area of the hard disk. If such an
- infection is discovered, you are alerted appropriately.
-
- NOTE: IDE hard drives larger than 1024 cylinders often require the
- use of additional driver or overlay files. If you have such a drive,
- you may need to include these additional files on your Norton
- AntiVirus Rescue Disk to ensure recovery from virus emergencies. Make
- sure that any special driver or overlay files for your hard drive,
- which are part of your normal system configuration, are included on
- your rescue disk.
-
-
-