Tag Info

Hot answers tagged

83

A small trick I learned years ago - lay your email out like this: Short Version Small number of very short succinct points If X, then you need to do this Else, then you need to do that (or don't need to do anything) Long Version or Full Details ...and here you lay out whatever full version you want. 97% of your users will never ...


71

In my experience management doesn't like to listen to clever analogies. Depending on the person they care about the bottom line in dollars or hours of productivity. I would explain "The actual bottom line is that a compromise of our data will cost the company approximately X dollars + X hours to recover. This is X% likely to happen given the malware that is ...


46

No Quarantine is nothing but a place to store the infected/suspicious files. When you quarantine a file it is deleted from the actual place and moved to the quarantine location (to the path that your anti-virus program has for them). This is something like keeping a zombie inside a jail. Obviously it is not a threat as long as you don't open the cage. In ...


44

Most anti-virus vendors advise not to use their products together with those from others. That's not (just) because they fear competition. Live virus-scanners scan files on access. When they notice that a process accesses a file, they try to access it before the process to scan it. They even try to do that when that process is another virus-scanner. When ...


39

There is no clear evidence that third party anti-malware security software (AV software) is more effective than Apple's own security solutions to protect Macs. Rich Mogull on the Mac TidBITS blog explains: Far less malware exists for Macs, but even there we see limited effectiveness across tools. For example, in a recent test by Thomas Reed, even the ...


35

Antivirus detection is a feature extraction and a classification problem. A great analogy is the 20 questions game where the goal is to identify an arbitrary object by asking 20 seemingly unrelated yes/no questions. The idea behind the game is that each answer would eliminate half of the objects so it is theoretically possible to describe 2^20 (1,048,576) ...


34

I would advise against it. In order to perform its job, an antivirus software has to root itself very deeply inside the system, hooking everything, installing drivers and you-name-it. In order to do so, it ends up using techniques similar to malware authors, which will be flagged as highly suspicious by other products. Even if it's not the case, it is ...


33

Let us analyze each one of the techniques you want the AV to protect against: UAC Bypass: Any process in the Windows environment running with the trusted root certificate can turn off the UAC bit of its own process, as well as any process spawned by it. This means that if your malicious code can inject itself into a process running with the trusted cert, it ...


32

You can install an antivirus if you want. It should not hurt your machine, but don't expect much protection for your system and don't consider yourself entirely safe. The efficacy of antivirus software is very relative, and they're mostly in use to avoid propagate old malware especially if you have Windows machines in your ecosystem. You should expect a ...


27

Sure. In Cohen's famous result, he says that a perfect virus detector should emit an alarm if and only if the input program can ever act like a virus (i.e., infect your machine and do damage). Consider the following program: f(); infect_and_do_damage(); where f() is some harmless function, and infect_and_do_damage() is a viral payload that infects your ...


27

I would avoid the biological or non-business analogies (unless this is a hospital). Your job is to assess risk, cost, and provide options. Your management's job is to make the decision based on your analysis and advice. Generally, an approach in a tabular format is best. "approach", "likelihood of correcting the problem", "cost" are the minimum needed. ...


26

This is a little long but this exact argument has been rehashed for the last 14 years. I want to put it to bed. I worked for Apple Tech support from 1992-2001 and have been an Apple developer since. So, I have a very good historical view of Apple ecosystem malware security. My conclusion? 3rd party anti-malware software on the Mac is unnecessary and as ...


23

"You can drink all the red wine anti-virus you want to try and prevent getting cancer, but once you get that first tumor, more drinking isn't going to help. You need to cut it out and make sure that you get all of it, because if you don't it will come back again." "Once you get infected with a virus, the obvious symptoms are an annoyance, but it is what you ...


23

Despite the common wisdom, I would not recommend running anti-virus for two reasons: Anti-virus does not really work. Though it might catch trivial or well-known viruses, it mostly just gives you a false sense of security. Anti-virus can cause problems. In order to function, anti-virus programs have to situate themselves quite low on the computer ...


21

TL;DR: There are many more threat vectors from which a virus may be caught than you might think. Viruses commonly exploit holes in software for which there is not yet an available patch. Only third-party software, such as an Antivirus program which can detect and prevent execution of exploit code, can protect you from this. I've been reading on ...


20

Macs do get viruses, the main reason why there were historically so few viruses around for Mac is because their market share was so small. When someone writes a virus, most of the time they want to infect as many targets as possible. So 10 years ago this would result in almost only Windows viruses since they had such large market share. Recently, however, ...


19

As @gowenfawr says many users will not read messages no matter what you do. So, in cases when you need to guarantee that the message was delivered to the brain and not only inbox, or acted upon, what you need is a feedback mechanism. This can be simple, using social approach - for example asking users an essentially fake question while providing ...


17

You need anti-viruses for the following reasons: 0-days Unpatched vulnerabilities Deceptions you uses USB sticks on machine that are not yours Malicious users that could use your PC (in a way) Avoid virus propagations over all your data. Nobody knows all the infections vectors of virus. You could at any time encounter a way to be infected you don't know ...


17

The goal of most malware is to remain active as long as possible. The longer it can collect keystrokes, participate in DDoS attacks, redirect search results, send spam emails, shows popup ads, etc., the more profitable it is for the creator. To reach this goal, it has to be undetected. If a piece of malware infects a machine twice, it may leave the machine ...


17

It all depends on the person; but a good first step would be to change their default browser to Chrome or Firefox - install AdBlock Plus (http://adblockplus.org/, or similar) and Ghostery (http://www.ghostery.com/) in their browser, and a decent anti-virus (Microsoft Security Essentials (http://www.microsoft.com/mse) should be fine, and since it's free - you ...


16

Very easy. Didier Stevens has provided two open-source, Python-based scripts to perform PDF malware analysis. There are a few others that I will also highlight. The primary ones you want to run first are PDFiD (available another with Didier's other PDF Tools) and Pyew. Here is an article on how to run pdfid.py and see the expected results; Here is another ...


15

The difference is mostly a matter of historical tradition. Biologically, a virus is a piece of RNA. RNA is an intermediary vessel for genetic code, which temporarily duplicates a piece of the DNA (the permanent storage of genetic information in a cell). RNA then goes through some "engines" which can duplicate it and/or convert it into proteins (genetic code ...


15

Malware signatures are unique values that indicate the presence of malicious code. Simply speaking, When an anti-virus program scans your computer, it calculates the signature for a file (say like a hash), then compares that signature/hash to a list of known bad signatures. Calculating a single hash of a file and then comparing it against a list of millions ...


14

I'll answer in the form of an anecdote. Back in 2003, I was working in tech support for a Mac-based organisation. We were essentially a government contractor and, as such, nearly all our money came from sending Microsoft Word documents to the government to document what we had done and what we should be paid for. Someone managed to bring a Word macro virus ...


14

I think the authors real point is not the safety of a file once quarantined but rather what happens if the user says "no"? Does the system leave it where it is - a potentially big risk, or does it erase it - a potentially big risk. Without knowing what action will be taken if you don't quarantine, or indeed without explaining what quarantine means, the user ...


13

Detection for a piece of malware is never removed from a mainstream AV. Detection for old or rare malware is not removed mainly because AV benchmarks and clients seeing one AV missing detection while the others have it. Let's say a signature is added for "Malw" malware but then the persistent malware writer makes subtle changes to avoid that specific ...


12

But what if I have a virus right now? My PC is faster like this than with an AV Viruses are not (generally) about speed. A virus/trojan/malicious piece of software usually exists to make it's author money. Malware authors have gotten quite good at coming up with roundabout ways of doing this (in order of problems for you): Modify all your web search ...


12

I consider myself to have high technical skills, and usually find myself skimming or simply ignoring these kind of messages myself. However, I was installing a Google product recently that had the following header: Please read this carefully - It's not just the usual yada yada. Because of the light hearted nature of this, I found myself to read the docs ...



Only top voted, non community-wiki answers of a minimum length are eligible