Author Topic: Can ico file carry a virus or so?  (Read 16740 times)

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huidong

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Can ico file carry a virus or so?
« on: January 22, 2010, 11:39:47 PM »
Avast Web Shield frequently scans various favicon.ico files. I wonder if ico file is a potential threat, i.e. can it carry something malicious at all? If not, I will exclude this type. And I'd also like to know if jpg file can be malicious, since by default, Avast Web Shield excludes gif and png files, but not jpg.
Thank you!

morno

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Re: Can ico file carry a virus or so?
« Reply #1 on: January 22, 2010, 11:54:18 PM »
how big is the .ico file? yes images can carry viruses, etc.

Offline DavidR

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Re: Can ico file carry a virus or so?
« Reply #2 on: January 23, 2010, 12:50:38 AM »
Do you mean something like a favicon.ico file ?
The answer for that is also a yes as the file itself can be hacked to do something other than display the favourites icon.

If you mean .ico that you burn to CD/DVD, in the form of an image of a CD/DVD then absolutely, as that is like a huge archive file that could contain anything, just like the original CD/DVD.
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huidong

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Re: Can ico file carry a virus or so?
« Reply #3 on: January 23, 2010, 01:23:58 AM »
Yes favicon.ico from the websites I visit (Since I'm talking about the Web Shield). I did not say .iso, I mean .ico, which I don't think is any sort of CD/DVD image format. Am I correct?
By the way, could you say more about what kind of cracking or infection typically targets icon files, especially favicon.ico for websites? Thank you!

Offline DavidR

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Re: Can ico file carry a virus or so?
« Reply #4 on: January 23, 2010, 01:40:13 AM »
Yes you will have noticed a lot of detections by the web shield on hacked site, a trick to hack the favicon.ico file as the browser will try and load that into the address bar where the icon goes. So it can be used as a means or running malicious code.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 24.1.6099 (build 24.1.8821.762) UI 1.0.796/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security