Antivirus or anti-virus software is used to prevent, detect, and remove malware, including but not limited to computer viruses, computer worm, trojan horses, spyware and adware.

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How do anti-virus apps for Android work?

There seems to be a lot of anti-virus apps for Android. On a desktop or server an anti-virus must run with super-user privileges, however I am pretty sure these mobile anti-viruses are running as an ...
3
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1answer
2k views

Should I install an antivirus on my mobile phone?

Is it advisable to install an antivirus for a mobile? I have recently purchased Note 2. Not too sure of how heavy application usage would I indulge into. But I would like to know if for safety ...
3
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2answers
211 views

Why some antiviruses detect viruses and some not?

I am curious why some anti-viruses detect viruses and some do not. From what I found online, antiviruses parse the binary files and check the sequence of code which is malicious(exists in virus ...
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3answers
246 views

How isolated are 2 operating systems on 1 harddisk?

Lets say I have 2 windows dual booting on the same harddrive (windws 7), How isolated are they? I am thinking that there should be up to date antiviruses software on both Windows, and they should be ...
17
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7answers
804 views

How to deal with a person who gets easily fooled by internet and mail scams?

alternative title: How to deal with a person who has gotten paranoid and doesn't want to go online anymore? A person, who has over the years been scammed many times, by bad spam/fraud emails, and ...
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2answers
4k views

How do antiviruses scan for thousands of malware signatures in a short time?

Most antiviruses have hundreds of thousands or even millions of malware signatures and yet they scan many files in a reasonable short time with high detection rates. Even real-time scanners doesn't ...
5
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6answers
4k views

How can I tell whether this computer is part of a botnet?

One of the computers that I manage (in the family, not business) has a weird set of files in its boot: bash.exe, curl.exe, uname.exe, sed.exe, rm.exe, tail.exe, cut.exe, awk.exe, cat.exe, chmod.exe, ...
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2answers
3k views

Anyone out there using Umbrella from OpenDNS? What exactly is it?

I'm still looking for a centrally-managed AV/malware management system and I've been testing out both Panda and Webroot (due to their 'cloud-based' structure that doesn't require a server for me to ...
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7answers
5k views

How should I select which antivirus software to install on my new laptop?

I'm in a bit of a dilemma here. I have bought a new laptop with no antivirus installed. I'm wondering how to choose an appropriate antivirus software to install.
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2answers
1k views

Is Webroot's Business Endpoint Security up to snuff for mobile workforce?

I'm in a small software company and getting ready to begin supporting 7 remote sales guys out on the road. They all have recent ultrabooks and most of the tools they will be using are in in the ...
3
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6answers
2k views

Why do some antivirus programs find infections that others miss?

I have Avast Free antivirus on my Windows 7 PC and yesterday I used Bit Defender quick scan addons, which spotted a virus. In rechecking with Avast, it didn't pick it up. In scanning my system with ...
19
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3answers
1k views

Are older viruses removed from virus definition files?

Antivirus software receives constant updates in the form of virus definition files, containing the patterns used to identify viruses. It is a feature present on most (if not all) major AV for at least ...
2
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1answer
475 views

How does one test AV against zero-day malware?

Lately, I've read several articles about anti-malware software and one thing caught my eye - ability to detect zero-day attacks. In short - how does anti-malware / anti-virus industry test their own ...
6
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4answers
6k views

Why Adobe is recommending McAfee security scan during flash player installation?

Why is Adobe recommending a McAfee security scan during the installation of flash player?
2
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4answers
803 views

Are malicious scripts in batch files detected by antiviruses?

we have many scripts in shared folders in our IT Department. Are malicious scripts in batch files detected by antiviruses?
4
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1answer
830 views

Where can a virus or other malware “hide” on common PC and Mac hardware?

I'm looking for a detailed list of locations that viruses can "hide" in modern hardware even after a reboot. Some things that come to mind include Boot BIOS/Firmware CPU Microcode Connected PCI ...
7
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1answer
808 views

Have any viruses leveraging the GPU been discovered in the wild? What is the mitigation?

This news article from 2010 discusses how a GPU can be used by a virus to avoid detection by common anti-malware/anti-virus software. The idea is to obfuscate the virus payload and leverage the GPU's ...
2
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4answers
498 views

Can I safely trust my Anti-virus protection?

Recently when I was trying to install a software which didn't happen to be from reputed sources, my anti-virus popped up a warning saying: XYZ-antivirus blocked you from visiting an infected ...
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4answers
2k views

Antivirus Engine based MD5 or SHA1 hash?

I'm trying to understand more about MD5 and SHA1 hashes algorithms and their behavior in serious security software(found this but not helped me more). Why does ClamAV use additional scanning ...
2
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1answer
148 views

How should I select an antimalware solution?

As I prepare to reinstall the software on my machine, I am currently reevaluating my choice of anti-malware software for home use. What factors should I be considering? How reputable are AV-test and ...
0
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3answers
126 views

Does AV software protect web applications (Twitter, Facebook, etc) from attacks? (CSRF, etc)

Is it correct to say that AV software focuses on downloaded executables and locally malicious activity, and it doesn't actively scan HTTP/S content for web based attacks such as CSRF, XSS, phishing ...
2
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3answers
147 views

How to tell what viruses are covered by your anti-virus software

One of our corporate twitter accounts recently started sending out DMs to its followers. Looking at the content of these it seems we'd become infected with Troj/Mdrop-EML. All computers on our ...
4
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4answers
919 views

To what extent is FREE 3rd party antivirus software better than Windows 8 defender (if any)?

As someone who is not in a position to currently purchase an antivirus suite, I would like to know if having a free Avira or Avast or similar program is worth the overall system performance drop (I ...
67
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10answers
6k views

How do you explain the necessity of “nuke it from orbit” to management and users?

When a machine has been infected with malware, most of us here immediately identify the appropriate action as "nuke it from orbit" - i.e. wipe the system and start over. Unfortunately, this is often ...
2
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1answer
125 views

Is there a website or free downloadable program to identify and remove malware from an ISO file?

Is there a website or free downloadable program that allows a user to identify and remove multiple types of malware from an ISO file?
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6answers
7k views

Will antivirus detect all keyloggers?

Our company schedules Security Training courses for our personnel. In order for us to test them, we develop code such as keyloggers which we email to our personnel to detect stupid personnel, and of ...
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4answers
2k views

Is it necessary to scan users' file uploads by antivirus?

Web application allows users to upload files. Is it necessary to scan those files by antivirus? I'd want to hear answer in two scenarios: Type of file isn't checked when uploading. They are stored ...
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6answers
2k views

Whats the probability of a personal computer being hacked?

For a normal computer user following these practices: Have an up to date anti-virus with a firewall installed (Norton). Do not install cracked software. Do not open suspicious links or download ...
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1answer
360 views

What are the technial and programming requirements for writing a stealth keylogger? [closed]

I'm planning to write/code one such stealth keylogger that would bypass detection by a certain antivirus. (I don't want to name the vendor as I know how good Google queries are against StackExchange ...
16
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5answers
970 views

Why would a virus writer bother to check to see if a machine is infected before infecting it?

I was looking at the tripartite structure of a virus, and it seems to check to see if a computer is infected before infecting it with the virus. Would this be an attempt to use files that are already ...
19
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4answers
2k views

Are anti-virus companies companies regularly committing software piracy?

As Mikko Hypponen highlighted in a recent tweet, anti-Virus companies collect and store both samples of malicious software and samples of legitimate software: This got me to thinking, what ...
7
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2answers
365 views

How do AV vendors choose malware names?

If you take a look at McAfee's recent malware page, you'll see that the names in the "Malware name" column aren't very human-readable: Downloader.a!cnz, W32/Autorun.worm.bgh, ...
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2answers
8k views

Malware or buggy software gives Low Disk Space warning

Since a few days, I am getting an alert that in my c drive disk space is low. When I verified, free space in my c drive was decreasing hour by hour and there was a stage when it simply said that 0 mb ...
3
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4answers
382 views

Has any virus attempted to compromise the anti-virus database?

I was using an old version of Norton Anti Virus and the Live Update wouldn't run. The solution was to rename a file. This got me thinking if a virus could replace an anti-virus database with it's own ...
20
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2answers
826 views

Cohen's problem

Fred Cohen determined theoritically that viral detetction is an undecidable problem. Can anyone provide an intuitive reasoning for that? Background Fred Cohen experimented with computer viruses ...
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2answers
2k views

Avast says I don't need to use encrypted connections for my e-mail accounts

I am using Outlook 2010 and Avast anti-virus 7. Whenever I add an account to Outlook if I choose to use SSL for incoming or outgoing connections Avast alerts me I shouldn't use it because Avast can't ...
4
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1answer
173 views

How does my antivirus determine which CTL is used?

I have imported a trusted root certificate into the Windows local machine list. This works fine with my signed certificates, unless my AV (Bitdefender Antivirus Plus 2012) is set to "scan SSL", in ...
3
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5answers
1k views

How can I know if my PC is getting infected?

I have installed an antivirus, but as no antivirus is perfect, what can I do to diagnose if my PC is getting infected? For example, keeping a close eye on what programs and tasks run when I turn my ...
3
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2answers
562 views

Why do I get AV alerts when browsing a web page?

I'm using the latest version of Firefox and Windows is up to date. When I was browsing a webpage and clicked a link the browser displayed "connection has been reset" and AVAST poped-up saying "Alert!" ...
0
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2answers
234 views

How could an AV detect a virus that has a chance of not decrypting itself?

If I understand this correctly there is a chance the virus may not decrypt itself at all. How could an AV catch this? In some cases, the decryptor may start with a header whose intent is not ...
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1answer
132 views

Would this be plausible for a metamorphic virus? Not repeatedly infecting same system

Would this be plausible for a metamorphic virus? When a new generation (for lack of better word) is created it would hard code a random file name, that would be checked to see if the system was ...
1
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2answers
288 views

AV inserting email header logic

I want to write a small PHP emailing class to be able to send HTML emails. My problem is that in the receiving email an antivirus will insert a header which sometimes simply breaks the entire email. ...
3
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1answer
318 views

Does anti-virus/security software protect against NTFS ADS?

I know that NTFS has features called ADS which may be used to hide malware. So does antivirus/security software, such as Norton 360, protect against this type of attack?
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4answers
7k views

Is it ok to use computer while scanning for viruses?

Should one refrain from using the computer while a virus scan is in progress? Are there certain things that are ok and others not? For example is it ok to use a web browser while a scan is in ...
3
votes
1answer
16k views

does Avast SafeZone actually make a difference?

SafeZone is a feature in Avast Anti-Virus which is like a virtual machine that only has a web broswer. The benifit of this is that it can't be infected with spyware and isn't suseptible to keylogers. ...
2
votes
1answer
162 views

How are AV scanners protecting against encrypted (PGPd) malicious code?

As a user of PGP I worry about receiving a virus that was previous encrypted with my public key, which anybody can get by querying many PGP key servers. What prevents an attacker to target a PGP user ...
3
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3answers
578 views

How do polymorphic/metamorphic/self-encrypting/self-changing file infectors know if they have infected a file or not?

If a virus rewrites itself for each infection how would it know if it has infected a file or not? If it keeps infecting the same file soon the whole file structure will be corrupt. For example how ...
2
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2answers
210 views

How do viruses know if they have already infected a system or done something?

I know some viruses repeat the same actions over and over again with no break, thus grinding the network to a halt. But others "take a break" from there repetitive actions. For example Nimda ...
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2answers
370 views

Antivirus for Thesis

I just want to ask if you know any book or technical papers and theses regarding computer viruses and anti-viruses. 'cause we're having a hard time looking for updated books regarding ...
3
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2answers
510 views

Why does Antivirus Softwares have an Issue with EXE Packers

Im trying to pack an Executable using an Exe Packer like UPX.I packed and checked the File with VirusTotal.com.Here some 9 Antivirus Products say its a Virus actually its a harmless exe.I think the AV ...