Second, this affords an added element of speed, which can be quite significant if the introduction is over a wide number of hosts. By quickly ramping up the number of worm nodes, the worm network can be several generations ahead of a single-point worm introduction. Obviously, a nontrivial number of nodes are required to make this impact noticeable.

Lastly, when executed properly, it can help to obscure the location of the worm’s author. This is because of the diffusion of the worms’ source, which is quickly obscured by the activity of the network. However, this can easily backfire and provide a method of network triangulation to the real source, unless the tracks are well obscured.

This path obviously creates a much larger amount of work for the malicious attacker. They must gain control of enough systems on the Internet to make this approach feasible and worthwhile, which takes time and effort. Given the relative speed of a typical worm, the time it would take a worm to reach the numbers of affected hosts can quickly reach that of an active attacker working manually.
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Single point
The classic paradigm of the introduction of a worm is to use a single point of origin, such as a single Internet system. This host is set up to launch the worm and infect a number of child nodes, carrying the worm with it. These new nodes then begin the next round of target identification and compromise.

The trick is to find a well-connected and reasonably poorly monitored host. To achieve the maximum introduction from a single point, this node will have to infect several new hosts, which are also capable of a wide area of infection. This will be crucial in establishing the initial presence of the worm when it is most vulnerable, existing on only a few nodes.

An obvious weakness in this scenario is that the worm may be identified back to its source and ultimately its author. By combining a number of factors, including usage patterns of the source host or network, with the code base, investigators can sometimes establish the identity of the author of the malicious software.

One variation of this theme is to introduce the malicious software at a single point but use an accepted distribution mechanism to gain entry to the Internet. This includes a Trojan horse software package or a malicious file in a peer-to-peer network. While only a single point of entry for the software is used, it is then introduced to several computers which can then launch the worm onto multiple networks.

For the attacker, however, this is the easiest avenue of introducing a worm. It involves the fewest resources and, if the worm takes hold of the network early and establishes itself quickly, gives the quickest path to a stable infection.

The object and subject of worms and its behavior of attack are quite tickling and very interesting for writing an essay based on it. Why? because its just never ends, as long as computer technology still developing and increase, the materials and discussion just won’t end. For some people you might need to buy essays, cause its more practical and they just give you good essay with correct grammar.

The simplest way for a worm to spread as far as it can is to use random network scanning. In this method, the worm node randomly generates a network to scan, typically a block of 65,000 hosts (a /16 network) or 256 hosts (a /24) in a target network block. This worm node then begins to search for potential victims in that network space and attacks vulnerable hosts. This random walk is the classic spread model for network-based worms.

However, there are some issues with this method, of course. The first is that the pool of addresses in use on the Internet tends to cluster to the middle, typically between 128/8 and 220/8. However, sizable and interesting networks reside outside of this, such as cable modem networks in 24/4 and 64/4, along with several large, well-known corporate networks in this range. To be effective, the worm should focus its efforts on hosts that are likely to be vulnerable to its exploits as well as being widely found.

Secondly, it is easy to pick a network block that is sparsely populated. This then wastes the node’s time by scanning a network section that will contain few, if any, hosts it can attack or compromise. The likelihood of this is dependent on the network space chosen. Several of the class A networks below 127/8 that are almost completely unused. Some of these networks are used by researchers to study Internet security patterns or traffic issues.

Thirdly, it is important to have a good random number generator in use to achieve almost complete coverage of the chosen range. A weak random number generator will mean that some networks will be disproportionately scanned. Some networks may not be scanned at all when this occurs.

The advantages of this type of scanning are that, when properly executed, near total coverage of the Internet can be accomplished within a brief period of time. This can be of value for an attacker who wishes to gain access to the maximum number of hosts in a reasonable amount of time. Second, this type of worm is bound to be more persistent than a directed or island based scanning worm. Not every network will be able to eradicate the worm infestation, and the worm will hop from one network to others randomly, constantly finding a host to infect.

While the worm is likely to find a vulnerable host it can compromise within a potentially rich network, it is likely to hop out of the network again as it randomly generates a new network to scan. Also, this type of scanning pattern is very noisy and highly visible. As described above, the scanning of sparsely populated networks is likely, and a simple tracking of this will reveal the presence of a worm. Get more details information of worms with searching it online or from other research link or articles.

Ramen was a monolithic worm, which is to say that each instance of an infected host has the same files placed on it with the same capabilities. There exists some flexibility by using three different attack possibilities and by compiling the tools on both RedHat Linux versions 6.2 and 7.0, but each set of files (obtained as the tar package “ramen.tgz”) is carried with each instance of the worm.

The reconnaissance portion of the Ramen worm was a simple set of scanners for the vulnerabilities known to the system. Ramen combined TCP SYN scanning with banner analysis to etermine the infection potential of the target host. It used a small random class B (/16) network generator to determine what networks to scan.

The specific attacks known to Ramen were threefold: FTPd string format exploits against wu-ftpd 2.6.0, RPC.statd Linux unformatted strings exploits, and LPR string format attacks.

The system’s intelligence database was updated using e-mail messages from the system once it was infected to two central e-mail addresses. The e-mail contains the phrase “Eat Your Ramen!” with the subject as the network address of the infected system. The mail spool of the two accounts was therefore the intelligence database of infected machines.

Unused capabilities can be summarized as the other two exploits not used to gain entry into the system, which allow for some flexibility in targeting either RedHat 6.2 or 7.0 default installations. Ramen did not contain any additional attack capabilities, such as packet flooding techniques, nor did it contain any file manipulation methods.

In analyzing the complexity of the Ramen worm the author has cobbled together several well-known exploits and worm components and as methods utilizing only a few novel small binaries. Examination of the shell scripting techniques used shows low programming skills and a lack of efficiency in design.

These findings have two ramifications. First, it shows how easy it is to put together an effective worm with minimal coding or networking skills. Simply put, this is certainly within the realm of a garden variety “script kiddy” and will be a persistent problem for the foreseeable future. Second, it leaves, aside from any possible ownership or usage of the yahoo.com and hotmail.com e-mail accounts, very little hard evidence to backtrack to identify the worm’s author.

If you do need help writing essays from above discussing, I believe online materials are widely spread on the internet, but in case you’d like to determine that was the correct sources, compare it with books and research on public library or science magazine.

There are easy solutions for that, if your problem is in scheduling or don’t know how to start it, then you could use personal finance software. The software itself are vary, some you could download it for free.

Not just for personal only, the software also applicable for managing family funds, it able to organize on screen and speculate your money. Some software also giving some tips on how to decrease your expenditures, by decreasing your credit and maximizing your income.

The application software could required some installation, while others doesn’t need any, or usually called as pocket edition.

But finance software is not just about managing your funds, but there are other financial software that could help you increase your income such as forex automated trading. If you do familiar with stocks, forex, and trading, you’ll find the software very helpful and handy.

The list below offers tips on what you should do:
• Have real users test your software product. You may think you have created an easy-to-use intuitive piece of software, yet in the end it is not you who decides this. If you plan on selling software online successfully, you need to have real people test it to see how quick they understand how it works and learn how to use it. Not to mention their help in squashing the bugs you might have never noticed on your own, thus making your product as error free as possible.
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• Provide an accurate description of the software product. You need a clear and short description of what the software is and what it is used for, so that people can see whether they need it or not. Additional details should be provided somewhere else for those who really wish to know more.
• Make screen shots available. They say a picture makes a thousand words, so screen shots are a very helpful tool when selling software online. The screen shots tell the users if the software product has a well designed interface and let them get a good look at the menu bars and toolbars, for instance, which helps them quickly assess whether the required functionality is there.
• Use a try before you buy approach. Don’t just say your software is easy to use. If your software product is as easy to use as you say it is, then why not let people see that for themselves? Offer them the option to download of a copy of your software and try it before asking them to pay for it.
• Specify supported OS-es and licensing type. A list of supported operating systems is as necessary when selling software online as when selling it in a box in a traditional store. It has to be put in an easy to spot place for potential customers to find out at a glance whether the product will work on their computers or not. Adding other system requirements would be a good idea, too. Do specify the type of licensing for your software product (i.e. freeware, shareware etc).
• Include a help file and support details. Your software product has to have some documentation explaining users how to use it, be it in form of a help file or an online manual either included with the product or that can be downloaded separately. People also need to know where to reach you in case they need support, so do not forget to include such details (an e-mail address, and maybe a phone number, too).

Letting people see the product (by screen shots) and try it before they buy, providing help files with your software and support when necessary, properly testing it with real users to make sure it is easy to use are the things that you should have on your to-do list if you plan on selling software online and be successful at it.

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Cross selling involves five fundamentals:
• You have to know your products very well.
• You have to know your clients. To get the best results identify which customers are your best target.
• Ask questions and listen for clues.
• Pay attention to clients needs and only suggest relevant products.
• Suggest, don’t impose. These way clients will feel comfortable and more likely to accept your offer.

Most of the time, cross selling is a natural process, involving a simple operation: telling customers about your products. In software marketing, the publisher needs to establish which software product can be correlated with another one and be sold together as a package deal. Both the selection and the price can be based on several customer and product criteria, which should be set up before deciding on using the cross selling technique. These bundles may be added to the online shopping cart or advertised as a special software promotion on the site.

Successful cross selling can be achieved by applying several rules:
• Right timing. Don’t push sales if it seems the client doesn’t have the financial resources at that moment. Try to find out what the clients budget is and make your offer accordingly.
• Relevance. Suggesting too many software products unrelated to the original one may overwhelm the client and lead to failure.
• Post recommendations on the site. Professionals, experts or other customers may post their opinion and their recommendations on the site. It can show up as a list of related items bought by other customers that purchased the same product.
• Place cross selling items throughout your site, where they can help shoppers learn about your software products and business. Try mixing and matching different items to see which combinations work best.
• Offer a range of prices: low cost items may be considered impulse buys, but the clients may also purchase higher priced items that fit their needs.
The most important aspect in cross selling is customer satisfaction with the first software product they purchase, alongside with price and how well additional products fit their needs. In order for cross selling to work, the focus should be on the customer, not on pushing a certain software program. Before talking about additional products or services, the customer’s problems must be solved. Also, the customer needs to know how useful is the product you’re trying to sell in the first place.

What’s the most important downside of cross selling? Annoying clients to the point they leave without buying anything. This occurs if you continue to sell after the customer says he’s not interesting or when you’re pushing a product that’s not useful to the customer. In the end, combining customer service and cross selling will lead to increased online software sales.