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bios virus?


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#1 vikram kdas

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Posted 27 July 2015 - 04:31 PM

during copy of a os to an another dvd or the time of dowlowd a virus insert in a os dvd now it can install during installing the os? If os install any problem will occur?
 
what is bios virus? How can infect a computer by it? What is symptoms? Bios present in rom which is read only memory, it is possible a virus store in rom? I insert my virus containing pendrive on computer before on thn on the computer, can it infect the bios, i m not sure bt tnsd about it pls anyone clearify it,
 
my os is win 7 ultimate.

Edited by hamluis, 29 July 2015 - 02:52 PM.


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#2 jayarelawler

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Posted 29 July 2015 - 10:46 AM

BIOS isn't ROM and can easily be changed.  Viruses that infect BIOS came out back in the 90's, but with the advent of rootkits, they've gone by the wayside.  Now that UEFI is installed on every PC, it's possible to get a nasty BIOS virus that would make your PC unbootable, but that's not the intent of the virus developers, so nobody does that.  Cheers.



#3 vikram kdas

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Posted 29 July 2015 - 02:05 PM

thank you friend,

#4 quietman7

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Posted 29 July 2015 - 04:16 PM

Bios/UEFI (firmware) virus's exist but are very rare. Researchers have demonstrated in a test environment proof-of-concept viruses that could modify the flash BIOS or install a rootkit on the BIOS of some systems so that it could survive a reformat and reinfected a clean disk. This type of malware exists primarily in-the-wild and is not generic...meaning it's vendor specific and cannot modify all types of BIOS. Although in February 2015, Kaspersky Labs reported "persistent, invisible espionage malware inside the firmware of hard drives compatible with nearly all major hard drive brands: Seagate, Western Digital, Samsung". This particular threat targeted government and military institutions, telecom and energy companies, nuclear research facilities, oil companies, encryption software developers, and media outlets.This is a quote from my Security Colleague, Elise who works with the Emsisoft Anti-Malware Research Team.

Firmware is typically a small piece of software coded directly into a device (for example a video card or DVD writer) necessary for the device to function correctly. This code is highly device-dependent, different manufacturers and different models all require specific firmware. For that reason a firmware infection is not only highly unlikely but also very impractical for a malware writer. Someone who wants to create a successful infection not only needs to make sure the malware stays on the system (by making it harder to detect and delete), but also that it is distributed on a large scale. Deploying a firmware rootkit on a large scale is close to impossible as you'd have to write a lot of different versions for different hardware models.


UEFI (Unified Extensible Firmware Interface) was introducted as a replacement for traditional BIOS in order to standardize computer firmware through a reference specification. However, there are several companies that develop UEFI firmware and there can be significant differences between the implementations used by computer manufactures. These articles explain the complexity of the UEFI, secure boot protocol and exploitation.Fortunately, it's highly unlikely you will encounter a BIOS-level scenario as it is not practical for attackers to use such an exploit on a grand scale. Malware writers would much rather target a large audience through social engineering where they can use sophisticated but less technical means than a BIOS virus.
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#5 vikram kdas

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Posted 31 July 2015 - 08:38 AM

bios is write protected or not? If protected then how can a virus infect this




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