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Network virus
This document discusses network virus protection and prevention. It begins by defining a network virus and how they spread through networks by exploiting vulnerabilities. It notes that network viruses can quickly degrade network performance and disable devices. The document outlines types of network viruses like email worms and file sharing worms. It lists organizations and groups that are vulnerable to network viruses. It then discusses symptoms of virus attacks. The remainder covers protection methods like host-based and network-based antivirus software and firewalls. It stresses the importance of prevention and the virus removal process.
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Network virus
- 1. NETWORK VIRUS- PROTECTIONAND PREVENTION Presented By: Anup Mahato Electronics & Communication Engineering
- 2. ABOUT NETWORK VIRUS •What is a Network virus? • Types of Virus • Who are vulnerable? • How they spread? • Symptoms of attack PROTECTION AND PREVENTION • Host vs. Network-based antivirus • Firewall and its Function • Prevention • The steps in the virus removal process
- 3. INTRODUCTION • A network virus has the ability to quickly degrade the performance of a network, totally disabling critical devices, programs and network connections. • Once the infection spreads, fully eradicating it often becomes difficult. • Viruses that use network protocols to spread and infect other computers on a computer network are called worms.
- 4. TYPES OF NETWORKVIRUSES • E-mail (and other application) • Windows file sharing worms • Traditional Network Virus
- 5. WHO ARE VULNERABLE? • Financial institutions and banks • Internet service providers • Pharmaceutical companies • Government and defense agencies • Contractors to various government agencies • Multinational corporations • ANYONE ON THE NETWORK
- 6. HOW THEY SPREAD •A network virus makes use of networking protocols and/or applications to spread. • Network viruses make uses of system network mechanisms, search local and remote system information, monitor network traffic. • Take advantage of system and network vulnerabilities, and build network connections.
- 7. VIRUS/WORM/DATA SPREAD IN UNPROTECTED NETWORKS Small Town U.S.A. NAP Carrier NAP Carrier NAP Carrier NAP Carrier NAP University X Carrier NAP Los Angeles Carrier NAP Location NAP Location Location C A B St. Louis NAP Dept Dept Dept A C Dept B A Dept B
- 8. VIRUS/WORM/DATA SPREAD IN UNPROTECTED NETWORKS Small Town U.S.A. NAP Carrier NAP Carrier NAP Carrier NAP Carrier NAP University X Carrier NAP Los Angeles Carrier NAP Location NAP Location Location C A B St. Louis NAP Dept Dept Dept A C Dept B A Dept B
- 9. VIRUS/WORM/DATA SPREAD IN UNPROTECTED NETWORKS Small Town U.S.A. NAP Carrier NAP Carrier NAP Carrier NAP Carrier NAP University X Carrier NAP Los Angeles Carrier NAP Location NAP Location Location C A B St. Louis NAP Dept Dept Dept A C Dept B A Dept B
- 10. VIRUS/WORM/DATA SPREAD IN UNPROTECTED NETWORKS Small Town U.S.A. NAP Carrier NAP Carrier NAP Carrier NAP Carrier NAP University X Carrier NAP Los Angeles Carrier NAP Location NAP Location Location C A B St. Louis NAP Dept Dept Dept A C Dept B A Dept B
- 11. VIRUS/WORM/DATA CONTAINMENT IN PROTECTED NETWORKS Small Town U.S.A. NAP Carrier NAP Carrier NAP Carrier NAP Carrier NAP University X Carrier NAP Los Angeles Carrier NAP Location NAP Location Location C A B St. Louis NAP Dept Dept Dept A C Dept B A Dept B
- 12. SYMPTOMS • The computerfails to start • Programs will not launch or they fail when simple commands are performed • Names of files are changing or become unreadable • File contents change or are no longer accessible • Unusual words or graphics appear on the screen • Hard or floppy disks are formatted • Variations occur in computer performance, such as slowing down in loading or operation
- 13. PROTECTING A NETWORK • Single-User Anti-Virus Software • Managed Anti-Virus Service • Enforced Network Anti-Virus • Server-based Anti-Virus • Firewall to provide external Network security
- 14. HOST-BASED VS. NETWORK-BASEDANTIVIRUS Viruses enter an HAV (host-based antivirus) protected internal network
- 15. Using Network -basedAntivirus Firewall to stop viruses at the network edge
- 16. FIREWALL • A firewallis a combination of hardware components (such as routers, host computers, NIC cards) and appropriate software, that controls access between your private network (such as a LAN) and an external network (such as the Internet).
- 17. FUNCTIONS OF FIREWALL •A firewall provides specific exit and entry points to your network for both external and internal users. • We can also allow some external access from the Internet, but only to selected servers for sending email or accessing public corporate information. • Thus it can stop intensive hacking techniques in network virus implementation.
- 18. WHAT WE CANDO TO PREVENT A VIRUS ATTACK The best cure for any virus is prevention.To avoid virus infection, we need to do the following: • Develop a Virus Protection Plan • Install Network-Based Anti-Virus and Firewall • Scan, Update, and Upgrade Automatically • Back Up Your Data Regularly • Consider Every Disk, Program, and Email Attachment as a Threat • Use Caution When You Download Files from the Internet • Be Aware of Virus Hoaxes • Block executables file attachments • Educate Your Network Users • Avoid using accounts with administrative privileges on an infected network. • Strong password on Shared Drives/folder • Keep all applications (including your operating system) patched.
- 19. THE STEPS INTHE VIRUS REMOVAL PROCESS • Determine the type of virus • Isolate all infected systems and hard disks. • Make sure you have a clean hard disk drive formatted as a system disk • Use the clean system disk to boot up all systems with suspected infection • Scan every physical and logical hard disk, as well every USB Drives. • Clean the infected server.
- 20. CONCLUSION • When itcomes to virus attacks, knowledge is the best possible weapon to prevent them. • Preventive measures should be taken before viruses establish strong hold within a network. • For system administrators it is necessary to develop a Virus protection Plan and install Network-based antivirus and Firewall. • Establish a secure infrastructure for your network
- 21. THANK YOU STAYPROTECTED