A software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer.

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343
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18answers
265k views

How can I remove malicious spyware, malware, adware, viruses, trojans or rootkits from my PC?

What should I do if my Windows computer seems to be infected with a virus or malware? What are the symptoms of an infection? What should I do after noticing an infection? What can I do to get rid of ...
117
votes
5answers
18k views

Why does anti-virus software not delete the viruses, malware, etc., but instead quarantine them?

Why does anti-virus software not completely delete the viruses, malware, etc., but instead quarantine them? Is it not better to completely get rid of them? Why? And how can I manually remove them?
102
votes
5answers
3k views

Why the heck does NTFS allow invisible executables?

You can hide any file inside of another file just by typing: type sol.exe > container.txt:sol.exe and to run the file hidden file just use: start c:\hide\container.txt:sol.exe But the crazy ...
98
votes
23answers
15k views

How can I make a Windows PC bullet-proof for home users? [closed]

I realize that virus-proof on a Windows PC is far fetched, but in the interest of keeping time spent as the "family-tech-support" to a minimum, I am looking for ideas to lock a computer down to the ...
93
votes
15answers
67k views

Can AVI files contain a virus?

I'm downloading an AVI file via a torrent, but my anti-virus detects something. Is it possible that the AVI file contains a virus? It is quite weird since the torrent has many positive reviews.
59
votes
7answers
21k views

My webcam just came on “out of the blue”

I have a Microsoft LifeCam HD sitting atop my monitor. Today, completely out of the blue, its light came on -- I was simply browsing the web (in Chrome) when it happened. After about 5 minutes the ...
36
votes
7answers
49k views

Can a virus from a VirtualBox VM affect the host computer?

Can a virus from a VirtualBox VM affect the host computer?
34
votes
4answers
42k views

Is my host machine completely isolated from a virus-infected virtual machine?

If I am running a Windows 7 virtual machine on a Windows 7 host using VMWare or VirtualBox (or anything else) and the virtual machine is completely overloaded with viruses and other malicious software,...
33
votes
6answers
7k views

Do all programs running in a computer show up in the processes tab in Task Manager? [duplicate]

The reason I am asking this is because I am curious if there can exist a virus in the computer without me ever being able to know it exists. To be more specific, a virus that emits no signs of any ...
25
votes
12answers
3k views

How can I explain what a computer virus is to people who are not familiar with computers and programming?

I have to teach a group of non-CS students what computer viruses are. The course material contains only definitions and some details about what those viruses do. But those things are known to everyone ...
22
votes
8answers
12k views

Virtual Machine and Virus

I have a requirement for which I have to get online without protection (firewall, anti-virus). At the same time, I don't want to risk getting infected with viruses. If I install a virtual machine (...
19
votes
4answers
2k views

What are ways to prevent files with the Right-to-Left Override Unicode character in their name (a malware spoofing method) from being written or read?

What are ways to avoid or prevent files with the RLO (Right-to-Left Override) Unicode character in their name (a malware method to spoof filenames) from being written or read in a Windows PC? More ...
17
votes
4answers
2k views

Is it safe to download and burn a disc image on an infected PC?

My PC is infected. If I download and burn linuxmint.iso on the infected PC, will the CD become infected also?
16
votes
5answers
17k views

Unreasonable RAM usage in Windows 7

I have a fresh install of Windows 7, and my RAM in normal startup goes up to 2.5GB. I looked at Task Manager, and there's at least 1.5GB missing from there and in Resource Monitor as well. There's no ...
16
votes
5answers
14k views

Why can I get a virus or trojan from visiting a website?

I have seen these a lot lately. You click the link, and instant trojan. No need to download or anything. How is this possible? Is there a way I can scan the links before visiting to make sure I won'...
16
votes
6answers
7k views

How can visiting a webpage infect your computer?

My mother's computer recently became infected with some sort of rootkit. It began when she received an email from a close friend asking her to check out some sort of webpage. I never saw it, but my ...
15
votes
7answers
42k views

Can system restore remove virus from the computer?

Can a system restore to a past time remove the virus from the computer?
15
votes
4answers
11k views

How to be certain you don't have a virus when anti-virus scanners find nothing malicious? (Windows 7)

I recently spent many hours troubleshooting a laptop that could not connect to the internet. The laptop exhibited no other unnatural behavior, and so my first thoughts were to try connecting to other ...
14
votes
8answers
10k views

Can a virus melt the CPU?

I was just wondering if a virus could melt a CPU by altering te voltage in the bios. :) (and no, I'm not planning on making that kind of a virus...)
14
votes
1answer
720 views

Why shouldn't we open an image in an email?

Most email clients do not display an image by default in the content of an email. But I don't understand this yet. How can displaying image job attack the computer?
13
votes
2answers
2k views

What does this entry in hosts-file mean: 192.168.3.2 NPI2A54EA

I took over a Windows 7 PC from a developer and in the hosts file there was this entry: 192.168.3.2 NPI2A54EB Does anybody know why this would be entered there and if this could be a virus or would ...
13
votes
3answers
5k views

How to know if your computer is hit by a dnschanger virus?

The Federal Bureau of Investigation (FBI) is on the final stage of its Operation Ghost Click, which strikes against the menace of the DNSChanger virus and trojan. Infected PCs running the ...
12
votes
4answers
16k views

A virusproof (ransomware…) strategy for backup on a NAS?

I bought a NAS to share files and as backup solution. Recently my netbook got infected by a ransomware. All files on the netbook and most of the file on the NAS were destroyed (the virus shuffles the ...
12
votes
4answers
2k views

Am I attacked or just stupid?

I run a server using Debian Squeeze with several OpenVZ containers. The containers run mostly Squeeze, some Lenny, and some already updated to Wheezy. The host doesn't do that much beyond iptables and ...
11
votes
2answers
67k views

usb flash drive contents replaced with a single shortcut

I was confused when I opened my flash drive all I saw was a shortcut with its target as C:\Windows\system32\rundll32.exe ~$WO.FAT32,_ldr@16 desktop.ini RET TLS " " You may refer to the images I ...
9
votes
4answers
800 views

Is it possible to safely contain a virus - not letting it spread?

I need to run a program, but I don't trust the author. I think it is infected with spyware or viruses, malicious files. I scanned it, did n't find anything, but still not feeling good about it. So I ...
9
votes
2answers
1k views

Why do scan results of hacked/hacker applications always indicate infection? [closed]

Whenever I scan a patch, keygen or a hacked application (using an online scanner service which scans with 20+ different antivirus software) the results always say that the file is infected. Do hackers ...
9
votes
9answers
8k views

UAC being turned off once a day on Windows 7

I have strange problem on my HP laptop. This began to happen recently. Whenever I start my machine, Windows 7 Action Center displays the following warning: You need to restart your computer for ...
9
votes
3answers
13k views

How to determine what is running in DLLHOST.EXE that's missing /ProcessID switch?

I have multiple dllhost.exe processes running on my computer: Every one of these image's command line is missing (what I am thinking is) the requisite /ProcessID:{000000000-0000-0000-0000-...
8
votes
17answers
379 views

How do I help somebody that asks me how to fix a PC with a virus?

As a developer, I'm always asked this by friends, family, family members of friends, friends of family members, friends who are in families of friends, and enemies. Because you know, I'm the guy that "...
8
votes
4answers
9k views

Can a virus corrupt a hard disk?

Shorter version: Hard disk corrupt, vendor claims warranty does not apply since it was "due to a virus" and "problems due to software are not covered under the warranty". Longer version: My Dell ...
8
votes
5answers
524 views

Jump drive with a virus

If I have a flash drive that I think may have a virus on it, but also has some important tax stuff on it, is there a way I can get at the files without endangering my computer?
8
votes
6answers
11k views

Can a virus infect an ISO file?

I feel that it's going to be very difficult for a virus to infect an ISO file. What's your experience? Have you seen it happening ever? Is it not nearly unlikely? I ask because I've just found that ...
8
votes
2answers
706 views

What happens if you install an antivirus program with another already installed? [duplicate]

Antivirus software always warns that any other antivirus currently installed should be uninstalled to avoid serious problems. From what I understand, one program may see another AV as a potential ...
8
votes
2answers
65k views

Where can you intentionally download computer virus online for testing purpose?

I want to run Computer virus on virtual machine to see how they behave, is there any online repository or database which store computer virus. Both old and new?
8
votes
5answers
7k views

Download Virus/Malware Purposefully

Where can I download a virus, work, trojan, etc. for analysis? Yes, I'm actually hunting for malware, rather than keeping it at bay and hiding behind antivirus software and firewalls. I plan to ...
8
votes
4answers
367 views

Detecting damage done by virus

This morning after I went to college, a virus infected my PC without any user interaction at my end. When I came home my computer was completely frozen and infected with lots of trojans. I have not ...
8
votes
2answers
181 views

How can I determine if a file or executable has a keylogger included with it?

I had a program created for me recently and didn't really think about it being executable posing a threat since I pretty much trust the source, but not completely. I then thought about the fact that ...
8
votes
1answer
358 views

Ever heard of a Windows service called 'darkness'?

Is it a malware? The computer has been diagnosed with some viruses. I've tried looking here but haven't found any information about it yet.
7
votes
2answers
2k views

Is there any way to prevent a USB flash drive from being written to? [duplicate]

I see lots of articles about preventing a specific computer from writing to a USB flash drive or preventing malware from getting from a USB flash drive to a computer; what I can’t find anything for is ...
7
votes
2answers
3k views

Security threat caused by Dropbox?

Recently I received a security threat alert triggered by Dropbox, as seen in the screenshot below: What happened here? Or this is a false alert from Microsoft Security Essentials?
7
votes
3answers
3k views

Edit Windows startup applications from Linux

I'm dealing with a Windows 7 that has got a virus that starts immediately on startup, locking the screen. It also runs in safemode (even with command prompt only). Only option is to switch the ...
7
votes
2answers
806 views

How do I browse a hard drive that has viruses?

I'm going to be connecting a notebook SATA drive to my computer via USB. This drive may be faulty so it may not work at all, however before it went supposedly "bad" it had a virus on it. My computer ...
7
votes
5answers
678 views

What is the difference between a Virus and Spyware?

Is the distinction largely semantic? (I.e., Spyware collects information and incidentally slow your computer down, Viruses are designed to malicious?
7
votes
4answers
495 views

How can I be in danger from viruses and malware?

I have been reading here (in superuser) some questions about the necessity of antivirus software in Windows and some doubts arise. As far as i know (and imagine) virus software can only be harmful if ...
7
votes
5answers
14k views

Is it possible to detect a virus with taskmanager?

If I would have a running virus on my system, would I be able to see the process in taskmanager? I mean, would it be possible for a running virus to circumvent the taskmanager so the process doesn't ...
7
votes
3answers
2k views

Can a computer be infected by malware through web browser?

Can a computer be infected when it accesses a malicious web page? Why is not a web browser 100% safe? What web resources, such as Java Script, Flash or a HTTP connection, can infect a computer?
7
votes
5answers
6k views

can a virus execute by itself?

is there any type of viruses can execute by itself after download then on the HDD without clicking on it?? if there is ..... can you refer me to any sites about them?
7
votes
3answers
8k views

Can a Virus Enter via Ubuntu and affect Windows in dual boot?

I have a Windows XP Pro dual booting with Ubuntu Jaunty Jackelope on a single hard drive. On Windows XP I have a Eset NOD 32 while on Ubuntu I have no antivirus installed. While working on the ...
7
votes
2answers
7k views

Gmail “Message left on the server”, how to automatically delete them?

in the last few weeks im receiving many allrts from gmail: while reading emails from another account, sometime it return Message left on the server: "Thank you for setting the order No.475456" becose ...