A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes.

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3
votes
2answers
76 views

My cellphone is infected, and it keeps coming back

Please bear with me as English is not my native language My Android smartphone downloads apps automatically without any interaction. Generally the apps are known but some are unknown apps. I can only ...
-4
votes
0answers
83 views

Can someone help me dissect this virus? [on hold]

It's a well known virus found on USB sticks, where it will hide the data in the pendrive and creates a shortcut of the pendrive inside pendrive. Plug this into any other computer, and the virus ...
21
votes
3answers
4k views

Is it possible to transfer a virus through browser video?

I know that there is already a question related to viruses in videos, but the implication in the other question is that videos in question have been downloaded and played by media software on the ...
20
votes
4answers
4k views

Is VLC on Linux vulnerable to an attack from .wmv files designed to install viruses? [duplicate]

I was stupid and did not check a video file I downloaded from an untrustworthy source. It was .wmv file with no readable properties of the video. I know that .wmv videos can download viruses. What I ...
1
vote
1answer
50 views

Virus/Trojan attached to GnuPG encrypted file

Is it possible to infect a file encrypted using GnuPG? For example, if I had an encrypted file on an unsecured public ftp server, would someone be able to copy that file and attach a virus/trojan ...
2
votes
1answer
20 views

Server loaded with antivirus lets viral file go through

We have a .NET MVC website with a WCF Service as a service layer. One of the feature that the service offers is the ability to upload documents. When we asked our security consultant to test our ...
-5
votes
0answers
97 views

Somehow hackers have used my email box to sign up me here!

I use same login name and password to many sites but this is strange, somebody used my email account to sign me up on stack exchange but also on Paypal but on the first mentioned with login ...
0
votes
0answers
29 views

Can a virus execute without user interaction? [duplicate]

I have seen a lot of malware infection techniques where the user is infected by drive by downloads through browser vulnerabilities or social engineering. But is there a way that a virus could execute ...
0
votes
1answer
47 views

What is ffmpegsumo.dll [closed]

What is ffmpegsumo.dll? I do not want to visit any websites as my AV protection is currently limited. It is one of the 4 DLLs that Avira detected on my computer. The files detected were: Unsigned ...
4
votes
1answer
119 views

Can a SIM card propagate malware?

Is it possible that malware can infect a SIM card? What will happen when I insert the SIM card in another phone?
2
votes
2answers
44 views

Protect against virus and malware attacks from website ads with iptables

Lots of websites spread malware by publishing advertisements that distribute malware. Even YouTube's ad network has been compromised in the past. Browser ad blockers and related plugins have there own ...
0
votes
1answer
89 views

PC reverting to infected state after virus removal [closed]

Whenever I leave my PC with a technician to get rid of viruses, this happens; at the shop the technician demonstrates that all has been fixed, but when I return home and connect hardware, after 15-20 ...
-1
votes
1answer
26 views

Does EMET auto update itself?

I cannot see this option and no answer after google for it. May be it is not good to update update itself since it suppose to be customized so if it updates itself would screw up the profile?
2
votes
2answers
64 views

Virus on mainboard(?) how does it work?

This post made me remember on a strange occurence I noticed somewhen back in 2008. At that time I had alot IT-problems I wasn't able to technically accurate fix, where I nowaday do, but that one still ...
129
votes
11answers
15k views

Can a computer virus be stored somewhere else than on the hard drive?

Are there viruses that have managed to hide themselves somewhere other than on the hard drive? Like CPU cache or on the motherboard? Is it even possible? Say I get a virus, so I get rid of the HDD ...
4
votes
1answer
41 views

How can I safely view the code of a VBA macro?

I have received a phishing email with the usual bogus bill in the form of a Word document. I am curious about what the probable virus wants to do so I would like to inspect the code. At the moment ...
16
votes
2answers
414 views

Do the most common ransomware programs delete the original files as they go, or in a big bulk delete at the very end?

I'm talking about the most common varieties like Cryptolocker, Cryptowall, Torrentlocker, KeRanger, RSA4096, etc. (There is not necessarily a need to answer for all of these, one or two may do.) If ...
139
votes
8answers
16k views

What should you do if you catch ransomware mid-operation?

You boot up your computer one day and while using it you notice that your drive is unusually busy. You check the System Monitor and notice that an unknown process is using the CPU and both reading and ...
-5
votes
0answers
7 views

What is i.ipricejs.info script after body tag in my page? [duplicate]

I am running one programe in my localhost. and found below script added automatically. <script ...
6
votes
2answers
187 views

Is this a Javascript virus?

So I got a random email saying this. Looks very automated: "How are things? I was visting your website on 4/9/2016 and I'm very interested. I'm currently looking for work either full time or ...
1
vote
2answers
65 views

VirusTotal desktop file uploader seems infected

I wanted to scan my process with VirusTotal.com and for this I downloaded vtuploader2.2.exe from their website. Before executing, I uploaded it to VirusTotal.com and scanned it for viruses to make ...
0
votes
2answers
56 views

Malware or viruses by browser redirects?

Recently was browsing and clicked on a link to the following address: (In code blocks so you cant accidently click it) http://paycheck-calculator.org/ Clicking on this quickly loaded 2-3 different ...
0
votes
0answers
7 views

Weird looking registry entry (virus)? [migrated]

I wanted to set photoshop as my default image viewer (need a workaround cause windows doesnt recognize it) so I have to edit my registry. In the tutorial on the official adobe website they are saying ...
1
vote
1answer
55 views

What are best methods to mitigate damage from MS Office VBA macro viruses?

We use Office macros in our work (for example: Excel User Defined Functions) so we cannot completely disable VBA in Office documents but I am looking for ways to avoid exposure to Office document ...
1
vote
2answers
98 views

How can i read the source code of this encoded powershell script from the registry?

I get this line by ProcessExplorer C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -executionpolicy bypass iex ...
0
votes
2answers
85 views

Is it possible to hide malicious code within/behind an image? [closed]

Is it possible to hide malicious code either within an image, or behind it as it is displayed on a webpage and then if the user saves this image, they actually are downloading the malicious code? ...
1
vote
1answer
53 views

How to distinguish malware from system crash?

Recently, I browsed to a website, which appeared to consume all the computer's resources. Although the mouse cursor continued to move, the browser (and other applications) slowed down fast and soon ...
1
vote
2answers
90 views

How would one recall a worm? [closed]

Hypothetically, say I wrote a worm, call it W1, just for fun/to see if I could, and it had silently infected a large number of computers attached to the internet. Say it didn't do anything but just ...
7
votes
4answers
994 views

How to trace the actions performed by a virus?

Is that possible to trace the actions performed by a virus? Run Time , stolen data and the files consulted and get the relative impact on my pc.?
9
votes
2answers
239 views

When do encryption viruses run? [duplicate]

Viruses that encrypt your files, like the recently very common 'Locky', seem to perform a lot of work before they are 'done'. I wonder, when do these programs run? They must take quite some time, ...
4
votes
1answer
67 views

Thorough computer scan

I'd like to give my computer an overall deep scan against all kinds of malware. I was infected about a year ago and I feel like there may still be some hidden rootkit on my HDD or something like ...
2
votes
3answers
123 views

Is it possible for a virus to be downloaded unknowingly and run when a website is opened?

Usually, the only time I see viruses happen is when someone mistakenly runs an infected file.
3
votes
1answer
124 views

How are viruses attached to files?

How do viruses attach to files? How does it infect applications? I'm talking about down to the binary level, how does code get added to a file to make it infected? Obviously, if we hash check the ...
1
vote
1answer
184 views

How to protect against the new malware Mazar Bot?

Mazar Bot is new Android malware that spreads via SMS. Its capabilities: It can read incoming SMS and send itself, make calls to directory contacts, contaminate Chrome, access to the Network, read the ...
81
votes
4answers
7k views

What is the risk of copy and pasting Linux commands from a website? How can some commands be invisible? [duplicate]

Like all beginners in the land of Linux, I usually look for websites that contain some useful shell commands, mark it with my mouse, copy it (CTRL + C) and paste it into a terminal. For example, if ...
-7
votes
2answers
176 views

What is is the best way to create virus signature database? [closed]

We are thinking to develop a new Antivirus program. The main concern is to create a virus signature database. I want to ask what is the best possible way to add viruses signature in our database to ...
0
votes
1answer
81 views

Objectively, how effective are malware removal tools at detecting infections?

I'm fully aware that concrete scientific data may not exist on this topic but I feel that the question at hand won't all boil down to opinion. Either way, with the rampant increase in sophistication ...
4
votes
4answers
106 views

What makes Malware so difficult to remove?

Why is it that when malware or adware is installed it's extremely difficult to remove? You can't go into your programs list to uninstall it and usually need a special program to remove it. What do the ...
0
votes
1answer
74 views

Virus: Images get replaced on website [closed]

I have installed Windows 7 again on my laptop with Chrome as browser. The problem is that on different websites I visit, the actual images of the website get replaced with out of context images. It ...
0
votes
2answers
50 views

Confusing definitions of “parasitic virus” and “worm”

I was studying for CISSP certification when I came across the question "what type of virus attaches itself to an executable?" The answer was "parasitic". I find terms relating to viruses and malware ...
4
votes
3answers
84 views

Is it dangerous to share a USB flashdrive? [duplicate]

Recently I've watched a movie "Blackhat" where just by inserting a USB flashdrive he could infect a host PC with some malicious program. Is it true that it's not safe to share USB flashdrives just ...
4
votes
3answers
112 views

Are virus signatures different between antiviruses?

Are virus signatures different between antiviruses? For example, can a virus signature in Kaspersky differ from the signature associated to the same virus in Avast?
2
votes
1answer
149 views

Is it possible for a virus to be redistributed through RAM?

I have a new, formatted, and up-to-date laptop. It's clean of any infections and I'm sure of it. The only change I've made is that I added a new 4G DDR3 RAM stick from my old laptop, and my new one ...
3
votes
3answers
266 views

Can a virus spread between two Android devices logged into the same Google account?

It seems like I have a virus on my android tablet. I have had my tablet for 2.5 years (virus problems for almost 5 months). I am thinking about buying a new phone (Android) in the near future (I ...
4
votes
1answer
162 views

Antivirus constantly detecting tmp files as threats

Recently my antivirus has been constantly detecting threats and it's always tmp files. I delete maybe 50 of these files each day. A few days ago it detected a trojan. Last week it detected many ...
19
votes
5answers
3k views

Is it possible for a file that is non-executable and read-only to run malicious code?

On a POSIX system, is there a possibility for a file which is non-executable and read-only (aka with a mode 444) to run malicious code on a machine? If so, can you explain how it would do so?
4
votes
1answer
194 views

Is this VM-sandbox idea a good idea for testing viruses? [duplicate]

You want to look at some viruses, so you use something like VirtualBox to create a sandbox environment. But what if we change that environment a lot? What if we do: STEP ONE: Create a bootable flash ...
4
votes
4answers
383 views

Can you use two hardware firewalls?

There is a rule that says "don't use/install more than one firewalls on one computer " (software firewalls to be exact) which means if you have a network and it has five computers you can only ...
3
votes
1answer
65 views

How To Remove Possible Virus Files

See the original question. Using both AutoRun, where I disabled anything that wasn't verified or highlighted (that seemed suspicious), I looked at Process Explorer and found the above unverified. In ...
1
vote
1answer
133 views

Do I Have A Virus (and What To Do)? [closed]

Background: Windows 8, not a special edition. Windows Defender and Webroot are both installed and have been installed for over a month. Yesterday I got a weird error that I've never seen before that ...