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Portable anti virus applications.


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18 replies to this topic

#1 talx

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Posted 16 November 2010 - 05:48 PM

I am lookng for a portable antivirus to put on a memory stick but i want one that will stop any virus from jumping from the pc to my memory stick (is ther such a thing) iv got portable antivirus app' that will let you scan the pc its inserted to but i want one that will automaticaly detect if a virus is trying to infect the memory stick, someone told me about an application called MK ONE has anybody used this, i know you can scan your memory stick after it has been inserted into a pc with a virus checker on a pc but i dont want the virus to get on the memory stick in the first place, any ideas thanks all.

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#2 Animal

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Posted 16 November 2010 - 06:01 PM

Take a look here: Portable ClamWin on a USB or Removable Drive

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#3 talx

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Posted 16 November 2010 - 06:15 PM

Iv got clamwin on my memory stick but that dont automatically stop any viruses getting on my memory stick you got to open the app up select which drive you want to scan, i dont think it will scan itself, i want a portable antivirus that when i insert into an infected pc and if that virus tries to jump over the the memory stick the anti virus app' will say 'virus just tried to infect this memory stick but was stopped' or words to that effect.

#4 micksim

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Posted 16 November 2010 - 06:29 PM

I'm not sure as to the existence of real-time security per-se on a memory stick, but there are several methods to achieve pretty good prevention and protection levels.

Check out this great post http://www.bleepingcomputer.com/forums/topic265672.html

And this article 10 Practical Ways to Prevent USB-Borne Virus Infection
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#5 quietman7

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Posted 16 November 2010 - 10:17 PM

If using Windows 7, be aware that in order to help prevent malware from spreading with AutoRun, the Windows 7 engineering team made important changes. Please refer to:
You can download and use Autorun Eater or Autorun USB Virus Finder which will allow removal of any suspicious 'autorun.inf' files they find.

Other scanning tools:
  • Malwarebytes' Anti-Malware. For usb flash drives and/or other removable drives, perform a Full scan. The option for a Flash Scan will analyze memory and autorun objects but that option is only available to licensed users in the paid version.
  • Norman Malware Cleaner. Be sure to print out the instructions provided on the same page. For usb flash drives and/or other removable drives to scan, use the Add button to browse to the drives location, click on the drive to highlight and choose Ok.
  • Dr.Web CureIt. Choose Custom Scan after the Express Scan has finished to add your usb drive to the scan.
    McAfee Avert Stinger Tool.
-- As an extra precaution, hold down the Shift key when inserting the drive until Windows detects it to keep autorun.inf from executing if it is present. Then perform your scans.
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#6 Romeo29

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Posted 16 November 2010 - 11:09 PM

This is very hard to do. Usually malware run automatically and do what they do when you insert a USB stick into your computer. This is why they made changes in Windows 7 and disabled autorun feature from USB sticks. Now you want to run an anti-virus automatically from the USB stick. You are going in the wrong direction.

If you are use your USB stick in computers which might be infected, then you need a USB stick with write protect switch.

Edited by Romeo29, 16 November 2010 - 11:09 PM.


#7 talx

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Posted 17 November 2010 - 08:46 AM

thanks for all your suggestions i think the best way to get around this is to get a memory stick with the protect switch/option on it so nothing can write itself to it from an infected pc the only problem i can see with this is if i insert it into an infected pc and run one of the sercurity apps on the stick and it finds a virus or whatever on the pc it wont be able to put that virus into the vault (as the memory stick is locked) but at least i will know whats wrong with the pc. thanks again all.

#8 quietman7

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Posted 17 November 2010 - 09:36 AM

Some USB flash drives have a write protect switch integrated on the side or on the back for preventing the content from being erased or overwritten. If your USB drive does not have such a switch, there are third-party utilities which can provide this type of protection.IMPORTANT NOTE: DSi USB Write-Blocker advises USB devices you wish to write-block must be disconnected from the computer before the write block is enabled.
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#9 talx

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Posted 17 November 2010 - 03:50 PM

Anybody know of any sites in the uk that sells memory sticks with this 'write protect' switch on, i have had a go of searching but seem to be going around in circles. thanks

#10 micksim

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Posted 17 November 2010 - 04:57 PM

Anybody know of any sites in the uk that sells memory sticks with this 'write protect' switch on, i have had a go of searching but seem to be going around in circles. thanks


Here

Here

Here
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#11 Didier Stevens

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Posted 18 November 2010 - 02:31 AM

Anybody know of any sites in the uk that sells memory sticks with this 'write protect' switch on, i have had a go of searching but seem to be going around in circles. thanks


I recommend another solution that is easier to find: an sd-card http://blog.didierstevens.com/2009/12/20/quickpost-read-only-usb-stick/

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#12 quietman7

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Posted 18 November 2010 - 08:01 AM

Looking for a USB Flash Drive with Read Only or Write Protect Switch
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#13 talx

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Posted 18 November 2010 - 12:19 PM

Didier: Yes i was only thinking about doing it this way the other day, and it seems mostly all sd cards have this switch and are cheaper than memory sticks thanks for reminding me, and you can get a sd card adapter (sd to usb) for £1. in those 'pound shops' sorted.

#14 micksim

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Posted 18 November 2010 - 01:57 PM

Didier: Yes i was only thinking about doing it this way the other day, and it seems mostly all sd cards have this switch and are cheaper than memory sticks thanks for reminding me, and you can get a sd card adapter (sd to usb) for £1. in those 'pound shops' sorted.



The reasons why prices vary most of the times will have something to do with read and write speeds, compatibility, dual-channel (or not), encryption and the list goes on. It also directly related to the capabilities of the technology itself (comparing the technology used in sdCards and memory sticks).

So, unless you're willing to give up on all the nice features (mostly speed) a more expensive drive has to offer, then go ahead and spend £1.

Also remember that typically, a switch write protected memory stick works at the hardware level - the switch actually disables the electronic circuitry that is used to perform writes. Without that circuitry working you simply cannot write data to the device - you can only read.

On the other hand, SD Cards, while they have a write-protect switch, are actually no good for this purpose because itís not actually hardware write protection Ė at best the card reader sends a signal to the operating system that the drive should be treated as read-only. The write-protect switch on the cards is read by a sensor thatís part of the card reader, and the card reader then passes along to the operating system whether the card is read-only. According to the specification from http://www.sdcard.org/:

A proper, matched, switch on the socket side will indicate to the host that the card is write-protected or not. It is the responsibility of the host to protect the card. The position of the write protect switch is unknown to the internal circuitry of the card.


Basically this means that either a-cheap card readers that lack the sensor or b-operating systems or malware that donít respect the ďplease donít write to this diskĒ flag can write to the drive. While this may not be likely, itís also not as secure as you might think based on the presence of that switch.

Some parts of this post have been extracted from here and here. I found these very informative and stood true all over the Web as I carried out my research.


Hope it helps :busy:
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#15 Romeo29

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Posted 18 November 2010 - 08:43 PM

I have found that SD cards are way slower compared to USB sticks - I do not know why. If you read Didier's post he mentions that even with SD card write-protect switch on, he could write data on it. So some SD cards do not really respect standards.




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