net security

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The most common include: Viruses, worms, and Trojan horses Intruders Spyware and adware Zero-day attacks(zero-hour attacks) Denial of service attacks

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What are Computer Viruses??? It is a computer program that can copy itself and infect a computer without permission or knowledge of the user.

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Some viruses are programmed to damage the computer by damaging programs, deleting files, or reformatting the hard disk. Others are not designed to do any damage, but simply replicate themselves and perhaps make their presence known by presenting text, video, or audio messages.

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Network Virus Logic Bombs Boot Virus(Disk Killer & Stone virus) Multipartite Virus(Invader, Flip & Tequila) Macro Virus(DMV, Nuclear) Trojan horse Worms Program virus(Sunday, Cascade)

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An intruder is somebody ("hacker" or "cracker") attempting to break into or misuse your system

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Trojan horse programs Back door and remote administration programs Denial of service Being an intermediary for another attack Unprotected Windows shares Mobile code (Java/JavaScript/ActiveX) Cross-site scripting Packet sniffing

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It is the art of detecting intruders behind attacks as unique persons. Intruder Detection Systems try to detect who is attacking a system by analyzing his or her computational behavior or biometric behavior.

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Keystroke Dynamics (keystroke patterns, typing pattern, typing behavior) Patterns using an interactive command interpreter: Commands used Commands sequence Accessed directories Character deletion Patterns on the network usage: IP address used ISP Country City Ports used TTL analysis Operating system used to attack Protocols used Connection times patterns

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Spyware is a type of malware Spyware programs can collect various types of personal information, Spyware is known to change computer settings,

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Come bundled with other software Web browser Web Sites

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CoolWebSearch, Internet Optimizer Hunt Bar, aka Win Tools or adware Web search Zango Zlob Trojan, or just Zlob

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It is a computer threat that tries to exploit computer application vulnerabilities that are unknown to others or undisclosed to the software developer.

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An attacker attempts to prevent users from accessing information or services. By targeting your computer and its network connection, or the computers and network of the sites you are trying to use, an attacker may be able to prevent you from accessing email, websites, online accounts (banking, etc.), or other services that rely on the affected computer.

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An attacker may use your computer to attack another computer.

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Not all disruptions to service are the result of a DoS. There may be technical problems with a particular network, or system administrators. The following symptoms could indicate a DoS or DDoS attack: unusually slow network performance (opening files or accessing websites) unavailability of a particular website inability to access any website dramatic increase in the amount of spam you receive in your account

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Spamming What is spam? Where does it come from? How much of a problem is spam? What can we do to stop or minimize spam coming to your computer?

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Experts believe that up to 90% of all email is now generated by spam robots. In 2007, for the first time, the total of spam emails surpassed genuine emails: 10.8 trillion to 10.5 trillion.

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Spam can be used to spread computer viruses, Trojan horses or other malicious software. The objective may be identity theft or fraud. Some spam attempts to capitalize on human greed whilst other attempts to use the victims' inexperience with computer technology to trick them, eg, phishing.

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BAD FOR YOU: Wastes bandwidth and YOUR valuable download allowance Wastes YOUR time dealing with it May contain malware than can infect YOUR computer May cost YOU money if you get tricked into giving out sensitive information

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BAD FOR BUSINESS: Spam affects productivity, i.e., wastes time and, in business, TIME IS MONEY. In Australia, the time and bandwidth lost to spam is estimated to cost business $2 billion a year. In the US, a national survey in 2004 found that workers spend 2.8 minutes a day deleting spam at a cost to business of $21.6 billion p.a. in lost productivity.

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Spam can be categorized into two main types: Emails that try to sell you something, e.g. Viagra or a fake Rolex watch, or Emails that try to steal your confidential or personal information, eg online banking login details, credit card details, or social security number (in the US).

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The type of spam that tries to trick you, in order to steal your personal information, is also known as “phishing”. The outcome to you can be very costly – you can lose a lot of money through fraudulent use of your online identity by cyber criminals.

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case study

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