BotNet, also called zombie network and network of bots is a group of computers which are used to discreetly send data like spam and viruses to other computers on the internet. These actions are carried out by malicious programs without the knowledge of the users. These malicious programs mainly consist of viruses, Trojans and worms. Infected computers are called bots or zombies. Most computers which are infected are personal home internet PCs which are inadequately protected.
When a PC becomes part of a BotNet, it can be instructed to do almost anything by the creator of botnet. In effect it becomes a drone which cannot resist the commands of its master. In this case, the master is the creator of the malicious software (malware). Most Bots are employed in propagation of spam and viruses. Often malware is used for key-press logging which can result in mass identity theft. Zombie computers can also be used for denial of service attacks in which many bots simultaneously log onto a particular server, thus exceeding the server's bandwidth and crashing it. This technique is particularly effective when the Botnet is large and contains thousands of computers. Many advanced malware can even spread themselves via email while the malware of smaller botnets lack this capability.
BotNets are programmed in such a way that they are difficult to find and analyze. Normally they receive instructions from their creators through IRC (Internet Relay Channels). As of April 2008, the Storm BotNet and the Kraken BotNet are the largest BotNets in the world with an estimated 400,000 bots. Other significant BotNets are Rbot and Bobax with an estimated 20,000 bots each.
So on a day to basis, the best way to protect your computer properly is to frequently scan and update your antivirus and firewall software. Special sensors called 'honeynets' have also been set up on the internet these nets mimic the characteristics of computers with known security flaws in an effort to lure hackers into them and track down malware creators. It has been recently quoted by Kaspersky Labs (creators of Kaspersky anti-virus) that botnets pose more of a threat to the internet community than individual viruses and worms.
Showing posts with label computer network. Show all posts
Showing posts with label computer network. Show all posts
Saturday, January 3, 2009
About Botnet
BotNet, also called zombie network and network of bots is a group of computers which are used to discreetly send data like spam and viruses to other computers on the internet. These actions are carried out by malicious programs without the knowledge of the users. These malicious programs mainly consist of viruses, Trojans and worms. Infected computers are called bots or zombies. Most computers which are infected are personal home internet PCs which are inadequately protected.
When a PC becomes part of a BotNet, it can be instructed to do almost anything by the creator of botnet. In effect it becomes a drone which cannot resist the commands of its master. In this case, the master is the creator of the malicious software (malware). Most Bots are employed in propagation of spam and viruses. Often malware is used for key-press logging which can result in mass identity theft. Zombie computers can also be used for denial of service attacks in which many bots simultaneously log onto a particular server, thus exceeding the server's bandwidth and crashing it. This technique is particularly effective when the Botnet is large and contains thousands of computers. Many advanced malware can even spread themselves via email while the malware of smaller botnets lack this capability.
BotNets are programmed in such a way that they are difficult to find and analyze. Normally they receive instructions from their creators through IRC (Internet Relay Channels). As of April 2008, the Storm BotNet and the Kraken BotNet are the largest BotNets in the world with an estimated 400,000 bots. Other significant BotNets are Rbot and Bobax with an estimated 20,000 bots each.
So on a day to basis, the best way to protect your computer properly is to frequently scan and update your antivirus and firewall software. Special sensors called 'honeynets' have also been set up on the internet these nets mimic the characteristics of computers with known security flaws in an effort to lure hackers into them and track down malware creators. It has been recently quoted by Kaspersky Labs (creators of Kaspersky anti-virus) that botnets pose more of a threat to the internet community than individual viruses and worms.
When a PC becomes part of a BotNet, it can be instructed to do almost anything by the creator of botnet. In effect it becomes a drone which cannot resist the commands of its master. In this case, the master is the creator of the malicious software (malware). Most Bots are employed in propagation of spam and viruses. Often malware is used for key-press logging which can result in mass identity theft. Zombie computers can also be used for denial of service attacks in which many bots simultaneously log onto a particular server, thus exceeding the server's bandwidth and crashing it. This technique is particularly effective when the Botnet is large and contains thousands of computers. Many advanced malware can even spread themselves via email while the malware of smaller botnets lack this capability.
BotNets are programmed in such a way that they are difficult to find and analyze. Normally they receive instructions from their creators through IRC (Internet Relay Channels). As of April 2008, the Storm BotNet and the Kraken BotNet are the largest BotNets in the world with an estimated 400,000 bots. Other significant BotNets are Rbot and Bobax with an estimated 20,000 bots each.
So on a day to basis, the best way to protect your computer properly is to frequently scan and update your antivirus and firewall software. Special sensors called 'honeynets' have also been set up on the internet these nets mimic the characteristics of computers with known security flaws in an effort to lure hackers into them and track down malware creators. It has been recently quoted by Kaspersky Labs (creators of Kaspersky anti-virus) that botnets pose more of a threat to the internet community than individual viruses and worms.
Sunday, December 28, 2008
It's 12 Noon, Do You Know Who's Using Your Network?
The idea of reading email while lounging by the pool, text or instant messaging while doing the laundry, or lounging in the Jacuzzi listening to your MP3 collection is appealing to us all.
Unfortunately, many, or even most, wireless units don't come with security features already functioning. This may not seem like a big issue to someone who is simply setting up a home network, but there are a number of potential problems you should consider.
The most serious problem is the increase in identity theft. If your network is unsecured, the personal data on your wireless electronic equipment is also unsecured. The order you just placed for a book at Amazon may have given your contact and payment information to an unscrupulous hacker!
Nearly every town in which "WiFi" is common will have "War Drivers" and "War Chalkers" at work. These are people who walk or drive around town with wireless equipment, searching for unsecured networks. The "Chalkers" then live up their name, marking curbs and other public items with chalk so that others can more easily find and exploit your network.
Not all "War Drivers" are hackers, of course. Many just want to use your network for free, but the risk is high if you don't learn how to protect yourself. You can usually find quite a bit of free information as to how to secure your network at the website of your router's manufacturer, or by doing a search in a search engine for a phrase like "secure home wireless."
Beyond the truly malicious, there are also your neighbors who may find your network by accident and enjoy nosing into your activities and using your Internet access at will, slowing down your network speed in the process.
Even many businesses use cheap, home-use quality equipment for their company networks. With the poor security often found on small business networks, anyone with a basic knowledge of wireless can access sensitive company and customer data.
If you are unable to secure your network yourself, there are many service companies who will do it for you. A search of your local yellow pages or an inquiry at your neighborhood computer store should yield professional help and get your private data private again
Unfortunately, many, or even most, wireless units don't come with security features already functioning. This may not seem like a big issue to someone who is simply setting up a home network, but there are a number of potential problems you should consider.
The most serious problem is the increase in identity theft. If your network is unsecured, the personal data on your wireless electronic equipment is also unsecured. The order you just placed for a book at Amazon may have given your contact and payment information to an unscrupulous hacker!
Nearly every town in which "WiFi" is common will have "War Drivers" and "War Chalkers" at work. These are people who walk or drive around town with wireless equipment, searching for unsecured networks. The "Chalkers" then live up their name, marking curbs and other public items with chalk so that others can more easily find and exploit your network.
Not all "War Drivers" are hackers, of course. Many just want to use your network for free, but the risk is high if you don't learn how to protect yourself. You can usually find quite a bit of free information as to how to secure your network at the website of your router's manufacturer, or by doing a search in a search engine for a phrase like "secure home wireless."
Beyond the truly malicious, there are also your neighbors who may find your network by accident and enjoy nosing into your activities and using your Internet access at will, slowing down your network speed in the process.
Even many businesses use cheap, home-use quality equipment for their company networks. With the poor security often found on small business networks, anyone with a basic knowledge of wireless can access sensitive company and customer data.
If you are unable to secure your network yourself, there are many service companies who will do it for you. A search of your local yellow pages or an inquiry at your neighborhood computer store should yield professional help and get your private data private again
Saturday, December 27, 2008
Computer Network Management
Today it is almost inconceivable for a business not to have computers, whether it is a construction company or a high technology firm. When a business has more than one computer, they are almost always connected together in a local area network. These networks may be more or less advanced and therefore more or less costly.
Companies invest so much (in terms of both money and time) in a local area networks because there are many advantages that a local area network brings to a business and how it is administered.
Some businesses use a local area network in such a way they are highly dependent on it always working. If the company's network fails, then you may see all the employees chatting away in the corridors because they can't do their work. This means big losses for the company and causes stresses on the employees. All companies must consider their local area networks a vital asset and downtime must be avoided. This imposes huge demands on the network staff to keep such networks running almost 100% of the time.
The advantages of Computer Network Management
One of the main advantages of installing and maintaining LANs is the opportunity they create for better communication and cooperation between employees and customers.
Security considerations: Local Area Network security can be both a help and hindrance. Comprehensive security is beneficial because it provides a central and safe strategy for data access and disaster recovery. All information is protected by the design and implementation of the network security solution. On the other hand, interconnecting computers in local area networks creates a security risk, since doing so makes it technically possible for intruders to access many machines on the network at once.
Cost considerations: Installing a local area network is a relatively expensive project. Servers, cabling, switches, routers and software can all be expensive and should never be purchased without expert advice. Keeping the network operating and secure also requires a lot of resources and can be costly.
Surprisingly, a local area network can bring a number of cost savings. Sharing resources avoids the need to purchase equipment for each individual. Even more important is the security that a local area network can provide. Data loss could cost a business a great deal of money and in some cases, cause the business to shutdown altogether. Computer Network Management should require a consistent routine for data backups with regular checkups of data quality - a practice that will save a company huge sums in the event of a mishap.
Computer Network Management: preliminary analysis phases
The first phase of computer network management is to determine the source of the problem (a preliminary study that looks into several options of differing scope may be useful here) and defining it in a specification of requirements. Examples of what should be evaluated are different network operating systems, mail systems, and other applications. The choice of hardware components should also be evaluated. This phase is generally aimed at establishing what the system should do, not how it should do it.
Computer Network Management: design phase
The purpose of design phase is to determine how the requirements of the specification are to be met. The current approach to large, complex projects is to break them down into smaller, more manageable subprojects.
Computer Network Management: implementation phase
This phase involves the physical installation of the local area network. Cables are run, software is installed, and computers and other hardware are put in place.
Computer Network Management: integration and system testing phase
In this phase, commissioning of the network begins, and routines are adapted to users and the operating personnel. The system must be tested, both to ensure that the network meets the requirements set out in the specification and that it is stable enough to perform the central function it has in the organization.
Computer Network Management: operation and maintenance
Local area networks have complex operating routines. This is because there may be serious consequences when faults occur or unauthorized persons gain access to the system. Many companies have employees devoted solely to take care of running and maintaining computer networks. These system administrators may deal with network issues such as performance, reliability and security of both hardware and software.
Computer Network Management: tools
Although an organization may have computer administrators on site, they must also monitor the network more than eight hours a day. In fact, some of the worst trouble that arises with networks can happen during the night hours when nobody is using the network. With the right computer network management tools, your organization can receive the security of knowing that problems will be foreseen, prevented, and taken care of - and that your network administrator can be notified at a moment's notice, should anything go exceptionally wrong.
Companies invest so much (in terms of both money and time) in a local area networks because there are many advantages that a local area network brings to a business and how it is administered.
Some businesses use a local area network in such a way they are highly dependent on it always working. If the company's network fails, then you may see all the employees chatting away in the corridors because they can't do their work. This means big losses for the company and causes stresses on the employees. All companies must consider their local area networks a vital asset and downtime must be avoided. This imposes huge demands on the network staff to keep such networks running almost 100% of the time.
The advantages of Computer Network Management
One of the main advantages of installing and maintaining LANs is the opportunity they create for better communication and cooperation between employees and customers.
Security considerations: Local Area Network security can be both a help and hindrance. Comprehensive security is beneficial because it provides a central and safe strategy for data access and disaster recovery. All information is protected by the design and implementation of the network security solution. On the other hand, interconnecting computers in local area networks creates a security risk, since doing so makes it technically possible for intruders to access many machines on the network at once.
Cost considerations: Installing a local area network is a relatively expensive project. Servers, cabling, switches, routers and software can all be expensive and should never be purchased without expert advice. Keeping the network operating and secure also requires a lot of resources and can be costly.
Surprisingly, a local area network can bring a number of cost savings. Sharing resources avoids the need to purchase equipment for each individual. Even more important is the security that a local area network can provide. Data loss could cost a business a great deal of money and in some cases, cause the business to shutdown altogether. Computer Network Management should require a consistent routine for data backups with regular checkups of data quality - a practice that will save a company huge sums in the event of a mishap.
Computer Network Management: preliminary analysis phases
The first phase of computer network management is to determine the source of the problem (a preliminary study that looks into several options of differing scope may be useful here) and defining it in a specification of requirements. Examples of what should be evaluated are different network operating systems, mail systems, and other applications. The choice of hardware components should also be evaluated. This phase is generally aimed at establishing what the system should do, not how it should do it.
Computer Network Management: design phase
The purpose of design phase is to determine how the requirements of the specification are to be met. The current approach to large, complex projects is to break them down into smaller, more manageable subprojects.
Computer Network Management: implementation phase
This phase involves the physical installation of the local area network. Cables are run, software is installed, and computers and other hardware are put in place.
Computer Network Management: integration and system testing phase
In this phase, commissioning of the network begins, and routines are adapted to users and the operating personnel. The system must be tested, both to ensure that the network meets the requirements set out in the specification and that it is stable enough to perform the central function it has in the organization.
Computer Network Management: operation and maintenance
Local area networks have complex operating routines. This is because there may be serious consequences when faults occur or unauthorized persons gain access to the system. Many companies have employees devoted solely to take care of running and maintaining computer networks. These system administrators may deal with network issues such as performance, reliability and security of both hardware and software.
Computer Network Management: tools
Although an organization may have computer administrators on site, they must also monitor the network more than eight hours a day. In fact, some of the worst trouble that arises with networks can happen during the night hours when nobody is using the network. With the right computer network management tools, your organization can receive the security of knowing that problems will be foreseen, prevented, and taken care of - and that your network administrator can be notified at a moment's notice, should anything go exceptionally wrong.
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