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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2
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1answer
33 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 ...
4
votes
1answer
49 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 ...
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 ...
0
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0answers
33 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 ...
7
votes
2answers
267 views

Can malware infect more than one operating system?

Is is possible for malware to be written in a low-level language such as C or C++ and do the following: Infect a single operating systems(such as Windows) Detect other machines on the same network ...
129
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11answers
16k 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
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1answer
174 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
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2answers
66 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
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1answer
95 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 ...
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1answer
34 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
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2answers
78 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 ...
3
votes
3answers
454 views

How do I remove disorderstatus.ru virus? Prevent reinfection? Make sure there is no (BIOS) rootkit left?

I have recently had two PCs infected with disorderstatus.ru / differentia.ru, by plugging an infected pendrive. From Google searches, it appears that it is a recent virus, or at least with recent ...
1
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2answers
74 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 ...
6
votes
5answers
4k 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 ...
6
votes
2answers
255 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 ...
0
votes
2answers
97 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? ...
19
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5answers
3k views

Find Virus in an Image File

I just received a .jpg file that I'm almost positive contains a virus, so i have two questions about what I am able to do with the image. My first question originates from the fact that I opened the ...
1
vote
1answer
62 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 ...
9
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2answers
248 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, ...
7
votes
4answers
1k 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.?
1
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2answers
144 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 ([Text.Encoding]::ASCII.GetString([...
1
vote
1answer
61 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 ...
4
votes
2answers
818 views

Is there any known encrypting ransomware that attacks Macs?

Just about every article I read about Cryptowall, Cryptolocker, and its ilk seems to assume that the reader is running some flavor of Windows. When I Google "ransomware OSX", I get a long list of ...
1
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2answers
94 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 ...
4
votes
1answer
68 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 that....
10
votes
1answer
127 views

Computer Virus Phylogenies algorithms - pseudocode?

I've collected a large number of "Web Shell by oRb" (a.k.a. "FilesMan" backdoor, a.k.a. antichat backdoor) files by running a WordPress honeypot, and searching pastebin. The code in the variants is ...
3
votes
1answer
234 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 ...
1
vote
0answers
470 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
votes
4answers
61k 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
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1answer
216 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
268 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
91 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
120 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
votes
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 ...
1
vote
4answers
512 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
173 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
94 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
58 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
471 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
89 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
votes
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
128 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
votes
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
12k 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
605 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
243 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
286 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'...