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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1k views

CloudFlare - prompted for “attention required”

I am getting a CloudFlare - attention required / security check prompt on most of the sites I visit through my Macbook running OS X Yosemite, these sites work perfectly on other devices (such as iPad, ...
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4answers
86 views

How can I stop this remote attack?

Someone appears to be logging into my machine remotely, I am running Avast anti virus with Comodo Firewall both report no attacks.I only noticed this because on my router security logs I see the ...
0
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0answers
21 views

How to remove Cryptowall Locker Virus [duplicate]

I have been getting issues with this Cryptowall Locker Virus, is there any permanent solutions to remove this virus from my pc. I have taken help from ...
0
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0answers
47 views

scrncap.exe is it a virus? [on hold]

I have a hidden running process with name of scrncap.exe, my Security Task Manager discovered it and gave it danger rate of 100 to be a virus or malware. from the name it appears to be software to ...
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1answer
35 views

Can standalone malware survive on current mobile devices? [closed]

Can malware run on mobile devices? I don't see how it would be able to (given that those devices have fine-grained permissions and sandboxing). Unlike on a desktop OS, malware cannot access registry ...
4
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3answers
11k views

CryptoWall 3 - how to prevent and how to decrypt?

My father's computer is now infected with CryptoWall 3, according to the link below. http://www.bleepingcomputer.com/virus-removal/cryptowall-ransomware-information#CryptoWall Is there a way to ...
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2answers
74 views

Does Android have sufficient app sandboxing?

In a previous question in InfoSec, I asked about how to determine the safety of a sideloaded Android app that requires root permissions. Now I would like to ask a related, but different question: Is ...
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2answers
73 views

Does Dropbox offer any protection against infected files? [closed]

Does Dropbox offer any protection against sharing files which are infected? To give more info, my friends and I are currently working on a college project. We find it much more convenient using ...
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2answers
79 views

When using software to infect others, how are hackers them selves not infected? [closed]

I assume all hacking software (password cracker, R.A.T. etc...) are infected. So the hackers using it are probably hacked too, right ?
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1answer
209 views

SSH scan against D-Link routers: is there a (new) exploit?

TL;DR if you have a D-Link router perhaps it wouldn't be a bad idea to check its SSH settings and/or username/passwords. I am a long-time user of fail2ban on several machines, almost all Ubuntu 12 ...
0
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1answer
81 views

How can I tell if my client has been infected with CryptoWall?

Today a client ran a file they believed to be something else, they said a black window appeared, so I checked the code to see what it ran in CMD, but can't quite work out what it's doing. I've just ...
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1answer
77 views

using multiple Firefox profiles to increase security

I am wondering whether it would increase security in any significant way, if I would use two separate Firefox profiles, one for normal browsing and the other for private/secure websites, such as my ...
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3answers
91 views

Can a virus persist across Windows version upgrades?

It is possible for a trojan, which allows to secretly remote control a computer, to reinstall itself after upgrading to a newer Windows ?
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2answers
53 views

Determining safety of Android APK executable that requires root

On my request, a developer gave me a new version of his Android app to test. The app requires root permissions. I do not know the developer personally. I have no specific reasons to trust or ...
8
votes
2answers
924 views

Are there / have there ever been viruses that completely evade virus scanners for very long?

Are there, or have there ever been viruses that completely evade all virus scanners for a long time (e.g. longer than a year?)
0
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0answers
50 views

Protection against Bad USB not working for me

Protection against bad USB as described in this thread by user 10008 in the top voted answer is not working on my PC at the moment. I tried it when trying to install Ubuntu from a Live DVD to a USB ...
1
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2answers
111 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 ...
2
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1answer
2k views

Can a file .exe.part already have caused damage?

If on a Windows machine, an antivirus program has found a Win32:Rootkit in a file ...\Temp\...\xy.exe.part, could the file possibly already have caused damage or not given that it seems to be an ...
3
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2answers
207 views

I ran a virus on a PC. What should be the next steps?

I wanted to remove a probably malicious executable, but instead inadvertently double-clicked on it while using an account with administrative privileges. Nothing visible happened during a few seconds, ...
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3answers
99 views

How to make undetectable malware [closed]

Fred Cohen in 1986 has proved in his Ph.D. thesis the undecidability of viral detection (no perfect virus checker can ever exist). My question is : Is it possible for a malware to stay very long time ...
13
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3answers
6k views

Do I really need an Anti-Virus software if I'm careful about where I browse?

A friend told to me the following: I don't use Anti-Virus software at all, I am just careful about where I go and what I click on. I've also heard this from other people as I've repaired their ...
13
votes
3answers
356 views

remote desktop connection to a potentially compromised machine

I am using rdesktop client on Linux to connect to windows machines. If some of these machines were compromised by some evil malware/virus/worm/trojan, is there any way for the malware to "jump" to my ...
1
vote
1answer
107 views

Securely erasing USB flash drives from a bootable media

My question refers to securely erasing viruses from the usb flash drives, including the MBR, in case there is one. I was thinking of booting with Linux from a closed CD-R (a cd rather than USB flash ...
10
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4answers
1k views

What is Net-Worm.PHP.Mongiko trying to do?

I found several lines of this request in my web server access log: Source IP Dest IP Request Stat User agent 217.172.190.19 ...
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2answers
250 views

How to deal with resistant malware

Everytime I visit Gmail, Facebook, YouTube, or Yahoo mail, I get a popup "Please update Internet Explorer" (while I'm using Chrome!). I don't have screenshots but this website describes the problem. ...
0
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3answers
79 views

How an experienced user decides a download is safe? [closed]

I am new to computer security. I was wondering what an experienced information security user would do when inspecting a file for potential download. Obviously, it would be very difficult to look ...
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3answers
93 views

Can a wireless headphone (bluetooth) contain malware?

Can a wireless (bluetooth) headphone store data? Also, if it can, then can someone put malware in it? I assume that the device must necessarily be able to store some sort of data, since it has buttons ...
3
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3answers
129 views

PHP | Security for allowing user uploads

My Sittuation: I am creating a web application with PHP which allows users to scan their files for viruses. It allows the user to upload their files via the html "file" input type or via a URL. I ...
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1answer
231 views

How exactly do viruses get on computer when watching online porn? [duplicate]

I've been hearing that your computer could get infected when you visit porn sites, especially when watching videos. But how exactly do viruses get on client side? Is it by cache? Or maybe by ...
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2answers
320 views

How exactly do you infect the firmware of a hard drive? [closed]

Now that we are told that infecting firmware has been done in practice, how exactly does this work?
2
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2answers
68 views

Virus - by-pass with binairies repackaging

Why don’t « hackers » (or more accurately, « virus maker ») just do repackaging over their malware to by-pass antivirus software? Because it resolves the issue of the virus signature (kind of hash), ...
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1answer
87 views

IVE BEEN HACKED! [duplicate]

So i downloaded an application that was fishy that came out a couple hours ago on youtube and i was stupid and didnt scan it or anything and i let it run... blam instant security warnings and i ...
0
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2answers
4k views

What is the meaning of .ini file in startup folder?

Now my windows 7 is too slow and crashing usually. I checked the start up folder. I get a file with extension .ini. The content of file is [.ShellClassInfo] ...
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4answers
620 views

How to keep Mac secure from viruses, malware and keyloggers?

How can I download and install software and make sure that it is not infected with viruses, malware or a keylogger? Also, I heard that Macs "don't get viruses". Is this true? Is it a good practice to ...
22
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4answers
5k views

Are popular porn sites more likely to be infected with malware?

I'm trying to help my friend understand this because he believes that since a site is very popular, that it's less likely to infect its viewers because of its security! Is a popular site less likely ...
12
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8answers
4k 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 ...
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2answers
67 views

Is the convertomp3.com website hacked? :) [closed]

I wanted to convert a youtube video to mp3, but the website gaved me an EXE? ...
3
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3answers
2k views

Can malware physically damage a hard drive?

I recently responded to an incident of supposed malware infection. The symptoms were simply, "My computer freezes at random times." The response ended with replacement of the physical hard drive and ...
6
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5answers
6k 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 ...
0
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5answers
165 views

how to know that my pc is 100% clean?

I work as a programmer ,i want to make sure that no remote access tools RATS are on my pc before i work on my new project. it happened before that after finishing a hard project, a hacker went on my ...
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0answers
59 views

How to test backend virus behavior?

I have a website that allows the user to upload files. The front-end (web tier) checks the file extension and first few bytes of the file for the magic number of an acceptable file, but then ...
2
votes
2answers
80 views

Is it safe to store a file in a temporary folder before it has been scanned for a virus?

I'm working on an application that makes use of the Symantec Protection Engine to scan uploaded files. I'm having issues with my files after they have been scanned. One possible solution I've seen ...
1
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1answer
92 views

Has this method ever been used by viruses to check if system has already been infected?

I know the era of the self spreading worm is over, but has this mechanism for determining if a machine has already been infected or not ever been used? When a virus runs it checks to see if the ...
10
votes
5answers
262 views

Security of root terminal (su -) when logged into X

I often log into X as normal user (of course), open terminal and switch to root: su - I have then a terminal owned by user but effectively with root privileges. Are there any security issues in ...
4
votes
6answers
3k 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 ...
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0answers
44 views

Are old Android OS's a risk to Activesync email, and how do I block old devices?

I'm concerned that old versions of Android may be hacked through unpatched WebViews (in PhoneGap and other apps), exposing Activesync email data, and other sensitive information. To mitigate this, ...
2
votes
4answers
185 views

Should text files or image files be virus scanned during upload?

I have created an online web app for my company. It's being tested for security files. The tester loaded the EICAR text file. The virus scanner on the server caught and removed the file. I have only ...
19
votes
3answers
4k views

How can I tell if I have the citadel virus without downloading an antivirus?

I recently received an e-mail from Virgin Media indicating that I might have the Citadel virus. It obviously sounds like a fake e-mail, but I am almost certain it is genuine, as they had my name and ...
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1answer
326 views

Writing keylogger and viruses in python [closed]

So recently I have been working on some projects one of them is keylogger and the second is SYNflood (both in python). I want to know if ,is it a good practice to use python language for such ...
6
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3answers
2k views

Detected virus in pdf - should I be worried (CVE-2014-8449)?

I downloaded a pdf earlier, and I was trying to send it to my friend, but gmail said that it detected a virus. So I ran it through virustotal.com and only 1 out of 56 scanners came up with a virus - ...