55 Plus 14feb05


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55 Plus: 

55 Plus Feb 14 2005


Agenda Computer Threats – what they are and how to cope File Associations – how applications are started andamp; why you can’t always open email attachments Mike Lawrance – Looking at emails without opening. Q andamp; A – your turn to ask question and hopefully get answers

Different Threats: 

Different Threats They Are a Pain In The Neck MALWARE Virus Worm Spyware SPAM Computer Hacking What do they have in common? Require: 3 different utilities Maybe from same vendor


Disclaimer This topic is complex, and different individuals may view it differently. The content has been simplified and thus could be challenged by computer professionals. It will however give you a good idea of the threats and hopefully what you can do to adequately protect yourselves. I read a comment by an individual who suggested the only way to truly protect oneself is to have two computers - one connected to the internet and other not. You would then copy the files you wanted from one to the other. I not sure if I even totally agree with that statement.

Computer Hacking: 

Computer Hacking Intruders access your computer without your permission! Once the intruder is inside, they can do what they like! How might they get access? Home invasion example Unlocked door Open window Look for some point of vulnerability Internal set up Owner’s carelessness With computers: Most times it is via the network 'holes' in the software 'doors andamp; windows ' left open Set up by a virus

Computer Hacking: 

Computer Hacking How do you protect? In homes Install locks, alarms and intercoms. We might even install perimeter monitoring systems. Fix problem areas Start a Block Watch Use unlisted telephone numbers For computer Install firewalls - software and/or hardware Keep Operating System updates current – particularly with security Disconnect from the internet when not using – maybe! Be careful with for your identity Close open doors – if you know what they are.

Computer Hacking: 

Computer Hacking S/W firewall Blocks designated traffic – in and out H/W Firewall Blocks designated traffic – in and out Plus isolates computers behind firewall Network users can only see my gateway (router) address. I am hidden from their view.


Spam A bit like the junk mail the postman delivers with one big exception: there are virtually no constraints if I have to buy a stamp I might think twice there are no postage costs on the internet. How do they find you? Harvesting Webpages Harvesting Newsgroups Social Engineering – e.g. greeting cards sites Guessing Theft – a crafty website , a worm, a chain letter. Buying Sniffing


Spam How do you control Be careful who gets your email Use Spam filters – provided by internet providers, commercial products How does a spam filter work Look for irregularities Block known offenders Rule based filtering Issues May block legitimate Spammers use 'tricks' to fool filter rules – e.g. spelling errors Personally: I don’t think it will ever completely go away.


Malware Malware' is short for malicious software and is typically used as a catch-all term to refer to any software designed to cause damage to a single computer, server, or computer network, whether it's a virus, spyware, etc. Different types: Virus Worm Trojan Horse Spyware


Malware The difference between a virus and a worm is where they live and how they propagate. A virus attaches itself to another program or executable – e.g. a Word document macro. When a user opens up an object with a virus, the virus it will start spreading – e.g. if you receive a word document with a virus and open that document it might then infect every other word document you open. When you pass along any of the infected documents the virus will continue to spread as individuals open up the document.


Malware A worm is self contained. If you are infected with worm, it will likely start when you start your computer and begin spreading without any additional actions by you. One way it might do that is to look through you address book and send emails to individuals in you address book and include itself on the email. The unsuspecting individual receiving the email, will when they open the email, infect their computer and the propagation continues.


Malware A Trojan Horse is a way a virus or worm is spread – by pretending to be something else. The are 2 stages of a virus / worm The infectious stage - where spreads The destructive stage - when it will do its damage Remember a virus/worm is a program – it can do anything a program can do: Erase files Erase files on a particular day Erase files after it has attempted to infect x others Etc. Sometimes the damage is caused by the network traffic generated Sometime the damage could be done by sending confidential information to whoever.


Malware Spyware is similar to a virus or worm in that it is installed on your computer without your consent. Their purpose is the send information about you to someone: About your computer use habits Confidential information Etc They usually do not propagate and are installed when you install a particular products. Sometime they are necessary for the program to work Ad Pop-Ups are also installed without your consent or are part of the application you are using. They generate those annoying advertising pop-up.


Malware Detection and Removal Utility Programs to: Intercept incoming, and outgoing email Scanning existing files for malware presence Looking for known offenders Repair / quarantine Pop-up removal utilities will intercept known pop-ups Scan all potentially dangerous files For ALL known 'signatures' There are thousands Scanning is a lengthy process

Malware – Detection/Removal S/W: 

Malware – Detection/Removal S/W Researchers (the CIA) Detection/Removal SoftWare Findings Information Sources Each group has: Their focus items Their informational sources Therefore: You will need to install multiple products - Anti-Virus, Spyware removal, etc And maybe more than one of each.


Why Can’t I Open The Email Attachment Or A Discussion About File Assocoations

3 Different Ways to Start Programs: 

3 Different Ways to Start Programs From the Start Menu or Desktop Icon By dropping a file on an application icon By clicking on a file – e.g. a Word document Lets look at that happens with #3

File Types and Associations: 

File Types and Associations There are 100s of different file types .doc for MS Word documents .pdf for Acrobat Reader files .ppt for PowerPoint file Etc. You don’t have to use these designations if you don’t what to! Just because you add the .doc , for e.g, to a document doesn’t make it a Microsoft Word document. The application still need to understand the format

File Types and Associations: 

File Types and Associations BUT Windows has something called File Associations Files Association is a list of different file types with the default application used with that file type. When you install a application, The installation will update the File Association Table Sometime that is not desirable by the way! So when you click on the file this is what happens: ~~~~~ Doc = MS Word ~~~~~~ Determine Default Application

File Types and Associations: 

File Types and Associations When you click on an email attachment or open a file on a webpage the same actions occur. ~~~~~ Doc = MS Word ~~~~~~ Determine Default Application If Windows can’t find an association it will then prompt you to specify what application you would like to use.

File Types and Associations: 

File Types and Associations Windows will give you a list of possible applications. - You would choose the appropriate application If the application is not there you need to: Find the correct application by browsing Installing the correct application Send a message to the sender saying you don’t the application – maybe they can send it another format – i.e. a rtf instead of a lwb (Lotus WordPro) What happens if the wrong application is started You can modify the File Associations Much simpler with XP – in fact the whole area of file associations is much better with XP.


Time for Your Questions? But first we will ask Mike to show us how to read an email without opening it.

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