LAMPDocs

What are Computer Viruses and its Types?

Vladimir Usenco — Mon, 14 Mar 2011 05:50:35 +0000

Similar to a contagious organic agent that grows up and proliferates in living cells, a computer virus is hard to purge after it has attacked a PC. So it is important to have an idea about the different types of viruses.

Types of Computer Virus

Program Viruses: These infect the executable files and are loaded in memory during the execution, taking the virus along. The virus gets active in memory, forming copies and getting files infected.

Boot Virus: This one is a computer virus that usually infects the boot sector on floppy disks, hard disks, and supposedly also the other bootable media like DVD or CD. As soon as the infected PC boots the virus attacks floppies and other types of media when they are used. Boot viruses are not common these days because floppy disks are not used much.

Multipartite Viruses: Also called multi-part virus, these types of viruses attempt to attack both the executable, or program files and the boot sector concurrently. When virus attaches to boot sector, it will in turn affect the PC’s files, and when the virus bonds to files, it will attack the boot sector. This virus can infect a system again and again if all parts of the virus are not wiped out.

Stealth Viruses: These types of viruses use certain techniques to dodge detection. They might redirect the disk head to read another sector rather than the one where they reside or they may modify the reading of the size of infected file shown in the directory listing.

Polymorphic Viruses: Polymorphism means “several forms”. A basic example for this in programming is function overloading. A polymorphic virus usually uses a polymorphic code, that is, the program uses an intricate algorithm to change the makeup of the internal code whilst maintaining its core function.

Macro Viruses: A macro virus is a new one among the types of computer virus, and infects the macros within a template. When you unlock a spreadsheet or word processing document, the macro virus gets into Normal template. Each document you open points to Normal template, and therefore gets infected with the macro virus. As this virus attaches itself to documents, the attack can spread if the docs are opened using another PC.

This is just a quick glance on types of computer virus. There are a lot of more specialized types. However this info is sufficient for the common user to be more prepared to protect the PC.

White Box Linux

Thirupathi — Sat, 15 Jan 2011 08:34:29 +0000

White Box Linux is an effort to rebuild Red Hat’s Enterprise product from source, including only Free/Open source software. The first set of Release Candidate ISO images were released November 17, 2003. Version 4.0 was released May 6, 2005. Version 4 Respin 2 was released June 20, 2007. Version 5 had not materialized as of March 2, 2009.

White Box Linux Official website

Download link to the distribution ISO

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Webfish Linux

Thirupathi — Sat, 15 Jan 2011 08:30:47 +0000

Webfish linux is a Linux distribution aimed at servers, routers and customised workstations for experienced Linux users.

Webfish attempts ot get away from the “bloat” factor of many common distributions. Webfish does not include large amounts of binary packages, or a package manager. It is based on a small base set that provides kernel , GCC, Perl, Sed, Awk, Bash, ethernet tools etc. Basically, all that is required to run a base system and compile software but not any software itself. Not even a “telnet” command in sight. System software and services are installed from source using standard methods.

Webfish was oringinally based on the base package list from the linuxfromscratch.org project. The main reason for this is that there is no point in re-inventing the wheel and LFS have produced a nice colated list of base pacakges. Webfish, however, has evolved and is not just another LFS system. Package configurations have been modifed. Some things have been added. Webfish tries to be usable and to provide an altenative to having to compile the base system from scratch every single time whilst still maintaining the flexibility, optimisations and bloat-free nature of a stripped-down source distribution.

Users can, if they so wish, take Webfish a stage further and use my build profile to compile a webfish system completely from source. This should be fairly hassle free although you should probably experiment with the pre-compiled base’s first. Webfish linux is a Linux distribution aimed at servers, routers and customised workstations for experienced Linux users.

Webfish Linux Official website

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UnitedLinux

Thirupathi — Sat, 15 Jan 2011 08:25:41 +0000

UnitedLinux – a result of cooperation between companies in the industrial scale, which have pooled their experience Intelligent and experience in business to produce a unified platform based on Linux operating system in a corporate system. The project uses and combines the business model and the development of open source to achieve a unified environment for developers, resellers and customers, which will have important properties such as updatable, maintenance and support worldwide. The project is actively recruiting participants for all categories of the organization. More information about the project you will be able to get browsing the website or by calling 1-781-876-8989.

UnitedLinux Official website

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Unifix

Thirupathi — Sat, 15 Jan 2011 08:17:25 +0000

Unifix is the original POSIX certified Linux distribution. Last updated December 25, 2001.

Unifix Official website

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TINY 1.3

Thirupathi — Sat, 15 Jan 2011 08:02:18 +0000

Tiny Linux is a small Linux distribution designed especially for old recycled computers.

TINY 1.3 Official website

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TimeSys Linux/RT

Thirupathi — Sat, 15 Jan 2011 07:56:12 +0000

Timesys is a Linux pioneer and industry leader among embedded Linux companies. They have supplied leading-edge Linux products and services to more than one thousand customers / embedded developers targeting Linux as their go-to-market platform. Check out some of the services projects they have delivered successfully.
Timesys represents a unique combination of both breadth and depth of experience. Over the years, they have supported eight architectures, more than 100 different application processors and SOCs and more than 150 different hardware platforms — with more being added as the market evolves. The Linux expertise covers the following:
Processors — Power Architecture, x86, ARM, Atmel, MIPS, TI, Intel, and more
Operating Systems — Linux, Embedded Linux, uClinux, and others
Languages — C, C++
Architectures — ARM, MIPS, Power Architecture, SH, ColdFire, and more
Technologies — Wireless, Networking, Audio, Video, 3D, Graphics, and more
Industries — consumer electronics, medical, automotive, telecommunications, industrial control/process automation and many more
Platform Services — From kernel porting and board bring up to device drivers and design, The expertise covers all areas of building and customizing your embedded platform
Application Services — The developers possess both knowledge of the technologies and industry experience for a variety of applications requiring 3D, socket, CAN interface, Web/J2EE programming

TimeSys Linux/RT Official website

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ThePacketMaster

Thirupathi — Sat, 15 Jan 2011 07:45:29 +0000

ThePacketMaster Linux Security Server is a CD-based security auditing tool that boots and runs penetration testing and forensic analysis tools. It is handy for security auditors. Some tools included are nessus, ethereal, The Coroner’s Toolkit, chntpw, and minicom. It includes modules for any Linux 2.4.20 SCSI driver. Initial version 1.0.0 was released July 5, 2003. Version 1.2.1 was released January 30, 2004. November 12 2009: main site timed out, nothing new on Freshmeat or SourceForge, moved to historical.

ThePacketMaster Official website

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Splack

Thirupathi — Sat, 15 Jan 2011 07:30:11 +0000

Splack was a volunteer effort to maintain Slackware on Sparc. Splack v-y1test was released September 30, 2001. Moved to historical section October 13, 2003.

Splack Official website

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Server optimized Linux 25.00

Thirupathi — Sat, 15 Jan 2011 07:12:16 +0000

SoL (Server optimized Linux) is a product of antitachyon, an Austrian company located in Vienna. Built from the ground up from original sources, SoL aims to be stable and fast server distribution. SoL 18.00 was released May 18, 2004. Antitachyon also provides the SoL-DESKTOP and XoL (Diskless X office Linux). SoL 25.00 was released June 26, 2007. Moved to historical January 6, 2009.
Fast&Easy Installation System with RAID Wizard
Supports Network (over PXE) and DVD Installation
Optimized for modern CPU Architectures
Ready to use as XEN dom0 or domU
Features QEMU mode to boot right from Windows!
“Ready for Cluster” Technology
Perfect integration for heterogenous Environments
Advanced XML boot Technology
Integrated Server Development Workbench Tools
Full-Feature Diskless training, evaluation and rescue mode! The only DVD you need! – aka: Sysadmins best friend
“Ready for Virtualization” Technology (featuring XEN and QEMU)

Server optimized Linux 25.00 Official website

Download link to the distribution ISO