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CRASHED! A topic for SEVERE and immediate Hardware and Operating System FAILURES. We will try to get you up again. NOT for Optimization questions!


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  #21 (permalink)  
Old 25th November, 2002, 10:34 PM
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Re: boot sector virus

Quote:
Originally posted by kat
No errors occurred and no viruses were found
A virus was found in memory
An internal program error occurred
One or more viruses were found in the master boot record/boot sector or files
Navdx self check failed it may be infected or damaged
Ctrl or ctrl-break was used to interrupt the scan
Sounds like NAV is not running correctly, and is spewing out rubbish. It looks like it's throwing out all it's messages, as some of those messages are mutually exclusive!

Personally, I prefer a boot floppy with the AV files on, as that way the AV software can be updated with the newer AV definitions. When you're stuck with a CD, it's a bit more difficult to update the CD to include the newer definitions!

AidanII
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  #22 (permalink)  
Old 25th November, 2002, 10:43 PM
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A boot sector virus typically installs itself in the MBR, and possibly other unused sectors, depending on how big it is. It generally stores the MBR code elsewhere on the disk, so it can execute it to boot the OS.

A few boot sector viruses can be quite cunning. Encryption of important drive structures (such as the FAT table) means that the hard disk shows up as unformatted when the machine is booted from a DOS disk or the like.

Even more cunning boot sector viruses do some interesting memory maniputation in order to put themselves into what is effectively video memory. This helps them survive certain types of boot.

No viruses in memory will survive a power off. This is simply because memory is volatile! The CMOS RAM won't store a virus, because it's too small, and it's not accessable as RAM! The CMOS RAM appears as two IO ports within the IO map of the system. (That means it appears as an expansion card)

Most boot sector viruses screw up Windows disk management code, because they hook int13. Windows realiases that the BIOS isn't in control, and assume that some form of disk management is. Generally Windows either rapidly crashes, or the drives will appear in 16bit compatibility mode (if you're running a 9x line). Win NT based systems have a tendancy to just crash instead.

AidanII
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  #23 (permalink)  
Old 28th November, 2002, 02:14 AM
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only 1 thing for it..

Drown the bugger! drown it in 4ft of water, then your computer shall be clear of any virus.

while this solves one problem, it MAY cause others

OR you could arrange for norton (i think its symnatech? i use trend no problems) to take your computer away to analyze the virus.

who knows perhaps they will give you a big phat cash reward?
just make sure theres no illegal stuff on there, i.e illegal porn.. remember stevie wonder? or am i thinking of someone else?

or another thing..

cant windows disable system keys when running shortcuts? in the properties > shortcut tab? if ctrl is disable how can a virus force it upon the program.

my 2 cents
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  #24 (permalink)  
Old 21st December, 2002, 05:12 AM
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i think i might have the answer for the dos scan not running on the kids pc

dos scans dont work with ntsf file systems???

yea/nea?????
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Last edited by kat; 21st December, 2002 at 05:19 AM.
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Old 21st December, 2002, 09:06 PM
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Quote:
Originally posted by kat
i think i might have the answer for the dos scan not running on the kids pc

dos scans dont work with ntsf file systems???

yea/nea?????
You would think that MS-DOS doesn't have a clue about NTFS. Why not try someone else's AV prog? www.grisoft.com . It's free, btw. No single AV prog is the Alpha and Omega.

If no AV can rid your MBR of this PITA virus, I believe that writing all zero's to the drive should put things right. The HDD must be partitioned and formatted afterward. Surely you have two or more hours free so close to Christmas? Can a virus destroy a HDD forever? Sure hope not!!
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  #26 (permalink)  
Old 22nd December, 2002, 05:24 AM
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i have reformatted the the drive, and all seems good,

unfortunately far to late to make use of your message....i guess i will try harder next time

late kat
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