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

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259 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 ...
3
votes
5answers
2k 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 ...
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0answers
475 views

wonderlandads.com popup virus [closed]

Problem As for this or this or even this, my computer has been infected to this sh-t and my browsers open an annoying pop-up on every single click to whatever web page I am visiting and this is ...
27
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4answers
62k views

How to inject executable, malicious code into PDF, JPEG, MP3, etc.?

I wanted to know if its generally possible to inject executable code into files like PDFs or JPEGs etc., or must there be some kind of security hole in the application? And if so, how would one do ...
1
vote
1answer
222 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 ...
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votes
2answers
296 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
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1answer
92 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
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4answers
121 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 ...
2
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2answers
17k views

How does Remote Access Trojan / Backdoor Software work?

How does a RAT works? I understand it as once we visit the infected website, the browser might download the Trojan to our PC automatically. Will it be executed and auto-installed in our computer? I ...
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vote
4answers
546 views

iPad infected with virus (popup - admobinew.com)

This morning I was reading some news on some websites (I think one of them was haaretz.com) using my iPad (ios 9.0.1), I clicked on a news and I was redirected to some dodgy website and I started ...
2
votes
1answer
188 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 ...
0
votes
1answer
99 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
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2answers
59 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 ...
5
votes
1answer
473 views

Is Adobe Flash Player installer redirect due to a malware?

When I go to http://get.adobe.com/flashplayer/ 'Install Now' will redirect me to their homepage without downloading the update or any explanation. What could be going on? Is some malware ...
4
votes
3answers
90 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 ...
0
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0answers
1k views

Shortcut Virus: All contents of my USB gets transferred into an unnamed hidden folder

Whenever I connect any USB into my PC. All of the contents of my USB gets thrown into a hidden unnamed folder which is getting irritating. I have tried to search online for solutions but none of them ...
4
votes
3answers
131 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?
9
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4answers
14k views

Is it worth it to get paid anti-virus software?

With the rise in cybercrime, I am slightly worried about my computer security. I have been using open sourced anti-virus AVG for years and it has been doing well. Are anti-virus software like Norton ...
20
votes
8answers
13k views

Can malware be attached to an image?

I have a small number of employees who use a company computer but these people aren't very tech savvy. They use an email client and a messaging client. I'm pretty sure they wouldn't click on .exe or ....
3
votes
3answers
802 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
266 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
1answer
364 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 '.json'...
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
4answers
573 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 install/...
3
votes
1answer
595 views

Cryptowall files found, but nothing encrypted

I've got a weird situation here and wanted to see if anyone else has run across this. Windows Security Essentials found Cryptowall on a system here and was able to remove the trojan that causes drops ...
1
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1answer
147 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 ...
4
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3answers
1k views

What do I do, I got a virus warning on a webpage

I went to the web address (hxxp://www.asanka.com) (WARNING: BE CAREFUL WHEN VISITING) on Safari, then suddenly I got a warning message [image below] What do I do? I'm freaked out. I have a lot of ...
3
votes
3answers
145 views

Can Chrome sync be infected?

Can Chrome sync be infected by malware? I cannot imagine how, but a particular unproven example that comes in mind is to change the "preferences", so that a malicious proxy server is added. Another ...
68
votes
6answers
39k views

Should I get an antivirus for Ubuntu?

Considering the recent thread regarding anti-virus for the Mac I wonder how many of the arguments put forth are relevant today to Linux systems, specifically Ubuntu. There are no known Ubuntu ...
11
votes
1answer
201 views

Microsoft Word protected view - is it secure enough to protect users?

We had a user receive an email with what appears to be a Word Doc virus and it wanted them to open the file and enable editing. If they did not enable editing but merely opened the file, should we be ...
5
votes
2answers
122 views

Can malicious software be installed inside Linux swap partition?

Is it possible for a virus of any kind to be installed inside Linux swap partition? If so, could it be transferred to the system even after formatting the Linux partition only and reinstalling the OS (...
2
votes
3answers
109 views

Methods to have multiple Anti Virus installed on one machine

I am running Windows 8.1 Pro, Ideally I would like to have the top 5 Anti Virus installed but I am aware it is not advised as they can clash with each other. I was wondering if there is a favoured ...
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votes
1answer
51 views

User information changing for online school site only

My son goes to online school. Our user name, password, email and security question keeps changing. Tech support is saying I have a hacker in my network. I have checked and changed all passwords for ...
2
votes
0answers
87 views

Linux machine continuously transferring data over the network to random servers in china and across the globe [duplicate]

I have been using Linux for about 5 years now but I am not very skilled with the commands to monitor and figure out internal issues. I recently was having trouble with the Internet. My roommates were ...
3
votes
3answers
117 views

Detect trojan/keylogger/virus on a businees network

On a business computer network with around 50 computers, there is a computer infected. We need to find that and remove it. I have been running the software below in the suspicious computers, but ...
1
vote
1answer
51 views

Terminology involving malware/virus/worm [duplicate]

What is the difference between "worms", "viruses", and "malware"? Some sources I've found said both viruses and worms infect files. But others say worms are stand alone programs, and are ...
11
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5answers
3k views

Can autoplay USB stick spread virus to windows 8 or 10?

Autoplay was a security hole on older versions of Windows, but can I trust newer version like Windows 8 or 10 to insert USB stick without turning autoplay off?
27
votes
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 ...
4
votes
2answers
553 views

Can a virus infect source code files with dangerous data?

If a user was infected with a file altering virus is it possible that checked in code (files containing text) to the source control could contain dangerous properties. I ask this after this got me ...
1
vote
1answer
416 views

How to check my application passes multiple virus scanners

I have an application I am trying to bring to market and I want to ensure that nothing in it is picked up by a virus scanner (since that would reflect badly on me). Since I only have a single scanner ...
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vote
4answers
119 views

What are cookies and cache?

While surfing on the Internet, I am often afraid that I may have downloaded some malware program along with some files on my computer. Furthermore, I have been told that the reason for that are ...
4
votes
2answers
610 views

Possible to detect an/or shut off CryptoLocker by limiting total network bytes transferred?

Since a virus infected PC has to download (encrypt) reupload the entire file (to a file server), and repeat the process for every network drive, is is possible to detect this unusually high bandwidth ...
5
votes
3answers
209 views

Best practice for home router configuration

Having read about the large number of routers infected by Wifatch, I've realised I don't know how to check whether my router has been infected with this or more malicious malware or what I'd do about ...
1
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2answers
708 views

How to find why so many host are talking to an IP which is blacklisted

In my SIEM tool, I got multiple alerts for communication with malware sites from Palo Alto firewall. I have seen many outbound communications from internal IPs toward IP: 74.217.31.51 having host name:...
3
votes
2answers
213 views

Decoding injected PHP malicious code in my server

I've found on internet similar issues, and I compared the code. This one is different. I recently found out that the CentOS LAMP webserver we use for development in our office was infected by a piece ...
0
votes
1answer
74 views

Malicious .scr file partially executed: sohanad?

I executed a .scr file, (without prior checking of the file ending, because the filename was longer than what the explorer showed) and there was a popup saying something. Instant realization that I ...
0
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1answer
278 views

How do hackers find vulnerability? [closed]

Is it a rigorous trail and error exercise or do they actually read the whole code to "think" about it to find the vulnerable point?
0
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2answers
318 views

Virus (or Trojan) in Android

Definition of virus is (from Wikipedia): A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data ...