The Adobe Acrobat (PDF) file here.
The document is 211KB. In the document I explain Internet protocols, ports,
setting firewall rules, firewall testing and so on. I also have a comparison
between some of the more popular home firewalls available. I have a comparison
chart summing up my findings. If you want to save the file for future
reference, just click the little stiffy disk icon in the top left of the Adobe
Acrobat toolbar.
If you do not have Adobe Acrobat 4 or later,
you must download Adobe Acrobat here
(8.57MB).
There are three main things that protect
your computer from harmful viruses and hackers:
1. An anti-virus program - to
protect against viruses and harmful code which can "infect" your
computer and corrupt information and/or cause your computer to crash.
2. A firewall - A program or piece
of hardware designed
to prevent hackers from gaining access to your computer to either steal
information, or to use your computer to hack other people. Firewalls also stop
malicious programs called "Trojan horses" from letting hackers take control of
your computer.
3. Common sense - A great deal of
hackers and viruses could be stopped with just a little common sense. Knowing
how viruses and hackers work is the only way to stop them from entering your
computer.
Here are a number of anti-virus
programs that I recommend:
1. Norton Antivirus - This is the
anti-virus program that I personally use. The best feature is that it runs
constantly in the background, thus protecting you against viruses on websites. The software is quite easy to use, and it caters for all levels of
competency. Get a trial version of Norton Antivirus at: http://www.symantec.com/downloads.
2. McAfee Antivirus - I have never
used this program, but I have heard from others that it is just as good as
Norton. You can get a trial version at: http://software.mcafee.com/centers/download/default.asp.
3. Housecall - This is an online
virus and Trojan checker. It is free, but I find it irritating because it is so
slow. Apparently after the first scan it gets quicker though. Get your free virus scan at: http://housecall.antivirus.com/housecall/start_pcc.asp.
4. AVG - This free virus
scanner/remover has received heaps of praise from all round. It is not quite as
good as a full-blown anti-virus that you pay for, but it is the best free
anti-virus that you will find.
Remember: An anti-virus program is only
effective if you keep it up to date by downloading the latest virus definitions.
An out of date virus program is almost as bad as no program at all!
And here are a number of firewalls I
recommend:
1. Norton Firewall - This is the
firewall that I use. It's fairly easy to set up and I haven't had any hassles
with hackers or anybody. I think there is now a trial version available, or
you can buy it from www.symantec.com.
2. Zone Alarm - This is a very
popular free firewall. It was (as far as I know) the first firewall to pass GRC's
Leak Test (http://grc.com/lt/leaktest.htm).
You can download Zone Alarm at www.zonealarm.com.
I might add that I have set up my Norton Firewall so that it also passes the
leaktest. It is very easy, you just set your firewall to notify you each time a
program accesses the Internet, and to give you the option of accepting or
rejecting the connection.
Set it to not allow any programs to access the Internet
without your permission. This can be a pain for the first couple of
days, but it's a real reassurance once it's finished bugging you. It helps to immunize you against trojan horses too!
I would strongly recommend paying for Zone Alarm Pro, because it has many
features that make it substantially more secure than the free Zone Alarm.
Note: If you speak in
Yahoo! chat in voice (and in any voice chat program), you may need to
make a firewall rule to allow the voice chat, otherwise people might say that you
are breaking up!
Here are a couple of tips and tricks
to help you defend against viruses, Trojans and hackers:
Security:
1. Go and test how secure your
system is at www.grc.com. There are a number of
tests there to check if you have any security holes. You can also test your
computer in a variety of ways at http://www.pcflank.com/.
This test includes browser security, an exploits test and more. It can take
quite a while though.
2. Adjust your browser security
settings. If you are in Internet Explorer, go to Tools>Internet Options.
Go to the Security tab, and ensure that you change the security settings for ALL of the
domains (Internet, local intranet, trusted sites and restricted sites) mentioned in the little box. DO NOT make the "Restricted Sites" less restricted. That is one easy way to get a virus or other
malicious material!
3. If you are not running a network,
you may wish to delete the networking protocols. These can be easily retrieved
if you ever wish to run a network. Go to Start>Settings>Control Panel and go to
Network. I only
have:
a) Microsoft Family Logon
b) Dial-up adapter
c) TCP/IP
You can delete the other protocols
(56K users only). Also, set Primary Network Logon to Windows
Logon. Now read my section on Disabling NetBIOS to
complete the job!
If you are using cable modem, or
some other equipment that requires other protocols, refer to your user's
manual. 
I have a 56K dial-up modem and this configuration works just
fine. It not only improves your security, but it speeds up your Internet too!!
4. Set your firewall so that it does
not allow any programs to access the Internet without prompting you. By doing
this, you can stop many trojan horses, e.g. Netbus from doing any harm, as the
controller of the trojan can't communicate with it. That is really good! I also
use this to prevent many programs from displaying adverts or downloading when I
don't want them to. If your firewall has an option to create firewall rules for
you, make sure you disable it, because it will ruin all your hard work. It can
also prevent some programs from working properly.
Privacy:
1. Want to know just how much people can find
out about you? You'd be VERY surprised. Pop in to www.privacy.net/analyze
to check how much they can tell you about your PC and your browsing habits. They
even tell you your screen resolution!!
2. Once you've done the privacy analysis, go
to their home page www.privacy.net to find
out how to make your browsing habits and computer specifications less
accessible.
3. I'd definitely encourage turning
off the auto-complete feature in Internet Explorer for certain things.
In Internet Explorer, go to
tools>Internet options. Click on the "content" tab and click
the
"AutoComplete" button. Ensure that AutoComplete for "forms" and
"user names and passwords on forms" is unchecked (i.e. there is no
mark in the box next to them). Also click "Clear Forms" and
"Clear Passwords", to delete any information that may already be on
your computer. Click OK until you have closed all the windows.
The reason for these measures is so
that if somebody gets into your computer, they can't get hold of personal
information, passwords and credit card numbers. If you have a firewall, this is
less likely to happen, but especially with credit card numbers and passwords I'd
be very careful.
4. Make sure that you never
give out your name, address, telephone number or any other private details to a
person on the Internet, no matter how nice he/she appears to be. Just from a
little crumb of information, they can find out everything about you, and some
maniacs on the Internet could even start stalking you in real life!! This is
something that you definitely don't need in your life. Remember, a person on the
Internet can pretend to be whoever or whatever they wish, and you would never
even know it! Stalkers on the Internet almost never appear suspicious or evil,
just like most criminals in real life.
5. Similarly, be careful what
information you give out in online surveys, feedback forms, and registering for
a service or user name. If a service requires your address, telephone number or
something private, unless it's a very reputable company like Yahoo!, never fill
it in. Just work out whether it is more important to you to join, or have your
privacy. Many companies sell your information to other companies, and then you
wonder why you get spam e-mails, telemarketing phone calls, door-to-door
advertisers etc!!
6. As boring as it may be, I
recommend that you read the End User License Agreements (EULA) for all products
you download/install and everything you sign up for on the Internet. Often these
agreements can contain some startling clauses. You don't want to find yourself
in trouble for not following the terms of the agreement!
1. Do not open e-mail attachments
unless you are 100% sure that the person they were sent from would actually send
you such a file. e.g., if you get a file from your mother telling you to check
out these great pics of Anna Kournikova, you can probably be quite sure that all
is not as it seems!
Remember: If in
doubt as to whether the attachment is genuinely from the sender, just send them an e-mail to confirm.
2. Be careful of virus hoaxes that
may be sent to you by e-mail. Visit www.kumite.com/myths
to find out more about hoaxes and myths!
3. Viruses can also be transmitted
through websites! Ensure that your virus scanner scans all files as they are written to the
hard drive, because otherwise you can get infected from a malicious website!
4. Disable Windows Scripting Host
(WSH). This may well be one of the most important tips on this page! Many, many
viruses are run using the WSH. If you disable it, many viruses cannot run and
can not damage your computer!! More than likely, you will never even need to use
this "feature" in Windows. To disable the WSH, go to start>settings>control
panel. Go to add/remove programs and click on the windows setup
tab. Click on accessories and click details... at the bottom of
the window. One of the last items on the list should be the WSH. To disable it,
make sure that the box next to WSH in not checked (no tick in the box).
Click OK until all the windows are closed. You will probably need to reboot
your computer after you are finished saving all your work.
5. Show file extensions. Many
viruses, especially those e-mailed, have double-extensions, like virus.txt.exe.
This file is an exe file, not a txt file!! However, if you have Hide
file extensions for known file types enabled, the file will show as
virus.txt only! This can be very deceiving. To show all file extensions, go to My
computer, click view, click folder options..., click on the view
tab and make sure that that Hide file extensions for known file types
does not have a check mark (tick) in it. If it does, uncheck (untick) it
and press ok. Now you will be safe from this nasty virus method!
6. Common extensions for viruses
include: exe, js, vbs, pif, com, bat.
1.
You
can e-mail
me and I'll try to set up a time to give your computer a fairly
comprehensive security scan for free. I have a number of programs that
can test for security issues and open ports etc. I would, naturally, provide
with advice on how to fix any security holes that do exist.
2.
Don't get into arguments with people (especially hackers!) in chat rooms. In
many cases your IP address can be easily obtained and the person you are arguing
with may decide to hack you! If you get into an argument with somebody you
suspect may be a hacker, exit the room immediately and close all the chat windows
and programs.
3. Do not visit
hacking websites. Many of these contain ActiveX controls that can hack your
computer through the website (even if you have a firewall) and can do other
damage.
Remember:
When you visit a website, your IP address is automatically recorded on the web
server log. Visiting hacking websites can lead to you personally being the target of
a group of hackers!
4. If you
have reason to suspect that your are being hacked, e.g. you have lost control of
your computer and somebody is moving around the mouse and opening programs, switch
off your modem! Nobody can hack you once you have your modem off. If you
have a dial-up modem, your IP address probably changes each time you dial up.
This way, they can't hack you again unless they planted files on your computer
to notify them when you're online and what your IP address is. This is unlikely
however.
5. If you suspect that somebody is
currently snooping:
Close
down all your programs, press alt-ctrl-del once to close down all background
programs except explorer, systray and your anti-virus and firewall. Go to start>run
and type command. This brings up the MS-DOS prompt. Type in Netstat,
and all connections to your computer will be revealed. If you are not on a
network, and there is anything that shows up when you type netstat, then
somebody is currently connected to your computer. Write down all the information
that comes up on your screen, i.e. protocol, ip number, port etc, and then
switch off your modem.
6. Get Trojan Remover by Simply
Super Software. You can get the program from http://www.simplysup.com/tremover/.
It is shareware, and must be registered after 30 days. This is not a big
problem, however, because in that time you can remove all the trojans currently
on your system. Unfortunately, you will not be protected from new ones after the
30 days.
When the
program is installed, open it and click on the little ambulance icon on
the toolbar, second icon from the left. This will check your computer for active
trojans. When you're done with that, you can do a full system scan by clicking
on the flashlight icon, third from the left. I must warn you that this
can take a long time if you have many files on your system. My scan took just
over 2½ hours!!
You
have a choice to delete or rename a trojan, when it is found, and Trojan Remover
provides data about the trojan. If you rename a trojan, it can no longer be run,
so it is harmless. It will still take up space on your hard drive and remains a
potential risk, however. The better option is to delete the trojan, but only do
this if you are sure the file is not legitimate.
Many people are not aware of
spyware, and that is one of the reasons it is so dangerous. The definition of
spyware is software that works for advertising companies, collecting data to
sell for money. That doesn't sound too bad, does it? Well, it is!
Spyware
products are also called advertising trojans. Have you ever encountered spyware?
Probably. Whenever you download a program like Kazaa, Bearshare, Limewire,
GoZilla! or many other useful programs, you are downloading spyware. It may be
noted that many (even most) file sharing software programs contain spyware.
There are luckily "clean" alternatives to most popular spyware
products, so you needn't worry too much about losing out if you dump the
spyware. If you would like to know of a clean alternative to a spyware product
you have, or if you suspect your product might be spyware, you can visit www.spychecker.com
and search their extensive database.
It is useful to note
that some spyware programs give you options to reject the spyware. I am not sure
if they still install the spyware regardless, but it's worth trying. Some names
of popular spyware are Bonzi Buddy, Cygate, Gator and WebHancer. Do not
install these programs no matter how useful or cute
they seem!
To find out if you
are "infected" with spyware, download a program called AdAware.
This program will search for and, if you wish, remove all spyware found in your
computer. A computer I recently "disinfected" had 1700 pieces of
spyware on the hard drive! The computer was part of a network, and after
disinfecting 4 computers, I had totalled over 5000 pieces of spyware on these
computers. They were noticeably faster after they were cleaned!
Do note that some programs like Kazaa won't work after the spyware has
been removed, so make use of AdAware's "backup" feature to be able to
restore any unwanted removals if necessary. The good news is that Kazaa
Lite has been released (unofficially of course) minus the spyware, so that
you can still enjoy Kazaa.
So
how does this all work? The spyware companies pay the software companies money
to include their spyware in their products (like Kazaa and Go!Zilla), and that
is often how these "free" software programs make a profit and stay
afloat.
Spyware resides in
your registry and your hard drive and invades your privacy. The spyware tracks
where you go on the Internet and what you do there. It then reports back to
"head office" and sends them all the information it has gathered.
Often this includes e-mail addresses and website addresses. They then use this
information to send spam (unsolicited e-mail) and to work out what method of
advertising would be most effective. If you are getting mysterious advertising
e-mails where they call you by your name, then you have probably been hit by
spyware!
This trick took me so long to work
out, that I decided to dedicate an entire section on it. NetBIOS is a service
that is used primarily for file and printer sharing in networks. If you run a
network, do not read this section; you'll probably just mess things up. If you
don't run a network, then this section will get you one step closer to having a
hacker-proof computer. Before you do the following steps, make sure that you
have completed this
First,
to see what I am talking about, go to control panel and then to Network.
Select TCP/IP and click Properties. Click OK when you get the
pop-up message. Now go to the NetBIOS tab. You should see that it says
"I want to enable NetBIOS over TCP/IP". Problem is, that in all
probability that text and the check-box next to it are greyed out! If it's not
greyed out, just untick it, press ok and jump to the next paragraph. Now, how on
earth are you supposed to disable it if it's greyed out? Well, it took quite a
bit of thinking, frankly, but I finally found the solution. Click on the Bindings
tab, and you should see that "Microsoft Family Logon" is in the box
and is ticked. Untick it and click OK at the bottom. If it tells you that you
need your Windows CD, just press cancel because you don't.
Now
you should be prompted to reboot your computer. Reboot and then
everything is finished! If you open up Network again you will be prompted
that "You network is not complete. Do you want to continue?". In true
Microsoft fashion it doesn't make an iota of difference which button you press!
You should notice now that Microsoft Family Logon is no longer listed. Also, if
you go to TCP/IP>NetBIOS again, you'll notice that the box is unticked, and
is no longer greyed out! OK your way out of there, and you're done!
So
you may ask "Well, why don't you just delete the Microsoft Family
Logon?". Truth is I tried that and I could no longer dial up to my ISP
(Internet Service Provider). Don't ask why, that's just what happened. It
disabled NetBIOS, but that's no help if you can't connect to Internet! As soon
as I restored the Family Logon it worked again. My method is, in my opinion, the
simplest solution.
If you're
wondering what made me go insane trying to work this out when I have a firewall
anyway, it's that I am trying to make my computer as secure as possible even
without a firewall running. If somebody manages to bypass your firewall,
you don't want your computer to be easy hunting ground. Paranoid, yes, but well
worth the hassle. GRC now shows all my ports as "closed" when I turn
off the firewall. Previously, my Port 139 (NetBIOS) showed open. That's what
triggered this whole story.
I have been meaning to add this
section for a long time, as I feel that cookies are an issue that is widely
misconceived and often leads to a lot of misinterpretation and even paranoia.
Cookies,
quite simply, are text files. People moaning about "receiving cookies in
their inbox" (of their e-mail), having "cookies and other programs
causing havoc" and all other accusations are talking nonsense. A cookie is
a text file placed in your Temporary Internet Files folder in order to help a
website to provide more customized service, or to make your use of the website
easier.
For example, Yahoo. If
you tell Yahoo, or any other similar website, to remember your username and
password when you log in, it places a cookie on your machine so that next time
you access the website it can log you in automatically. If you delete the
cookie, it will not log you in automatically unless you respecify it again when
you next log in manually.
Another
example where cookies are frequently used is forums. On Dr
Boot, and many other forums, cookies are used so that you can keep track of
which topics you have read, and which you have not. If it were not for cookies,
you would have to check every single topic to see whether or not you have
previously read it. This would obviously waste a lot of time.
If
you have specific preferences on a website, such as colours and designs of
various items, cookies can also keep track of this so that it can
"remember" your preferences when you next visit the website. Ever had
a website say "Welcome back [name]"? This is an example of cookies at
work.
Now, if all that I have
said so far is true, why do people consider cookies to be dangerous privacy
invaders? Well, cookies can keep track of your movements within that specific
website and see what links you click on and what you do. It cannot see where
else you have been and it cannot track you once you leave the site. The reason
that many websites track your movements, is to see what items customers find
more interesting. Websites can often tell which website (singular) you visited
before you visited their website, but this is hardly anything to worry about
(and it has nothing to do with cookies).
If
you want to see a cookie for yourself, and if this helps to convince you that
they really are quite harmless, navigate to c:\windows\temporary internet files
and open up any one of the text files that you find in that folder. Windows will
warn you that this may be unsafe, but it can't be, so just ignore it.
I
hope you have a better idea of what cookies are now, and can now inform paranoid
friends, family and neighbours that they will not be eaten up by a cookie
monster!
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