computer virus & its solutions
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8/8/2019 Computer Virus & Its Solutions
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Muhammad Alihyder BhuiyanNetwork and Security Administrator
Information Technology Division
Mercantile Bank Limited
Head Office, Dhaka.Ph: +88 01611 001 606
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Viruses
Worms
Trojans Malware
Spyware
Grayware and Adware
Introducing to:
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Computer viruses are small software programs that are designed to
spread from one computer to another and to interfere with computer
operation.
A virus might corrupt or delete data on your computer, use your e-mailprogram or LAN to spread itself to other computers, or even erase
everything on your hard disk
What is Computer Viruses ?
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Symptoms of a computer virus
The computer runs slower than usual.
The computer stops responding, or it locks up frequently.
The computer crashes, and then it restarts every few minutes.
The computer restarts on its own. Additionally, the computer does notrun as usual.
Applications on the computer do not work correctly.
Disks or disk-drives are inaccessible.
You cannot print items correctly. You see unusual error messages.
You see distorted menus and dialog boxes.
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Symptoms of a computer virus (cont.)
There is a double extension on an attachment that you recently opened,such as a .jpg, .vbs, .gif, or .exe. extension.
An antivirus program is disabled for no reason. Additionally, theantivirus program cannot be restarted.
An antivirus program cannot be installed on the computer, or theantivirus program will not run.
New icons appear on the desktop that you did not put there, or theicons are not associated with any recently installed programs.
Strange sounds or music plays from the speakers unexpectedly.
A program disappears from the computer even though you did notintentionally remove the program.
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How do Viruses Spread?
Viruses are often spread by over LAN or any Removal Disk or attachments in e-mail messages or instant messaging messages.That is why it is essential that you never open e-mail attachmentsunless you know who it's from and you are expecting it.
Viruses can be disguised as attachments of funny images,greeting cards, or audio and video files.
Viruses also spread through downloads on the Internet. They canbe hidden in illicit software or other files or programs you mightdownload.
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What isWorms ?
A computer worm is a program which copies itself across a network.
A computer worm differs from a computer virus in that a computer wormcan run itself.
A virus needs a host program to run, and the virus code runs as part of the host program.
A computer worm can spread without a host program, although somemodern computer worms also use files to hide inside.
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W
indows Security Alert Message
Message
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What is Trojan Horse ?
A Trojan horse is not a virus. It is a program that you run because you
think it will serve a useful purpose such as a game or provides
entertainment.
For example, you might download what you think is a new game; but
when you run it, it deletes files on your hard drive .
Or the third time you start the game, the program E-mails your saved
passwords to another person who writes this program.
it will scour your hard drive for any personal and financial information
such as your social security, account, and PIN numbers. Once it hascollected your info, it is sent to a thief¶s database.
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Symptoms of worms and Trojan horse
viruses in e-mail messages
The infected file may make copies of itself. This behavior may use
up all the free space on the hard disk.
A copy of the infected file may be sent to all the addresses in an e-
mail address list.
The computer virus may reformat the hard disk. This behavior will
delete files and programs.
The computer virus may install hidden programs, such as pirated
software. This pirated software may then be distributed and sold
from the computer.
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Symptoms of worms and Trojan horse viruses
in e-mail messages (Cont.)
The computer virus may reduce security. This could enable
intruders to remotely access the computer or the network. You receive an e-mail message that has a strange attachment.When you open the attachment, dialog boxes appear, or a suddendegradation in system performance occurs.
Someone tells you that they have recently received e-mailmessages from you that contained attached files that you did not
send. The files that are attached to the e-mail messages haveextensions such as .exe, .bat, .scr, and .vbs extensions.
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What is Malware ?
Malware is a generic term for bad software and portmanteau of
"malicious software". The term refers to any computer program that
harms the computer running it
Malware generally includes Spyware, Trojans, Adware, rootkits, dialers,
Key loggers, denial of service attacks, botnets, Crimeware, Badware,
viruses worms and any other types of unwanted or potentially unwanted
software. However, in the strictest sense, the term "Malware" expresses
its purpose rather than any particular characteristic.
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This is how to prevent infection by Malware ?
Do not click on pop-up advertisements.
Do not open e-mails from unfamiliar or questionable sources. Do not respond to online requests for personal information, such
as Social Security number, passwords, usernames or any other identifiers that could be used for fraudulent activities.
Download only those software programs that come from reputablesources.
Install a good anti-virus product, and make sure you are runningthe latest updates at all times.
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What is Spyware ?
Spyware are programs, cookies or registry entries that track your
activity & send that data off to someone who collects this data for their own purposes. Usually, those people are marketing companies trying tocollect information to help them sell better.
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Spyware (cont.)
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Spyware (cont.)
Spyware is often associated with software that displays advertisements
(called adware) or software that tracks personal or sensitive
information.
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Spyware (cont.)
Spyware basically collects personal information of the user and can
even change settings on the user¶s computer.
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Warning Message of Spyware
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What is Grayware ?
Grayware are programs that are neither spyware or a virus.
If an application is classified as annoying or behaves in annoying or undesirable fashion, yet isn¶t considered to be as dangerous, serious, or troublesome as malware, it is called Grayware or Greyware. Typically,
Grayware can encompass all of the following : ± Adware
± access tools
± dialers
± joke programs
± remote access tools ± Spyware
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Some Symptoms that may be the result of
ordinaryWindows functions
A computer virus infection may cause the following problems
There is frequent modem activity. If you have an external modem,you may notice the lights blinking frequently when the modem isnot being used. You may be unknowingly supplying piratedsoftware
Windows does not start because certain important system files are
missing. Additionally, you receive an error message that lists themissing files
You receive out-of-memory error messages even though thecomputer has sufficient RAM.
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Windows does not start even though you have not
made any system changes or even though you havenot installed or removed any programs.
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Some Symptoms that may be the result of
ordinary Windows functions
Continuation
The computer sometimes starts as expected. However, at other times,the computer stops responding before the desktop icons and thetaskbar appear.
The computer runs very slowly. Additionally, the computer takes longer than expected to start.
New programs are installed incorrectly.
Windows spontaneously restarts unexpectedly.
Programs that used to run stop responding frequently. Even if youremove and reinstall the programs, the issue continues to occur.
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Some Symptoms that may be the result of
ordinary Windows functions
Continuation
A disk utility such as Scandisk reports multiple serious disk errors.
A partition disappears.
The computer always stops responding when you try to use MicrosoftOffice products.
You cannot startWindows Task Manager.
Antivirus software indicates that a computer virus is present.
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Is This Solutions ?
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Is This Solutions ?
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Centralize Solutions
VPN
Internet
Antivirus Parents Server
Antivirus C hild Server
Router
P C
Antivirus C hild Server
Antivirus C hild Server
Antivirus C hild Server
P CPCPC
PCP CPC
PCPCP C
PCP CPC
PCP C
Switch
SwitchSwitch
Switch
Router
Router
Router
Router
Switch
VPN Router
A) Antivirus Parent Server will be upda ted directly from Internet . In scheduled interval the child server /P C ¶s attached
with the parent server will be updated automa tically .
B) AntivirusC
hild Server will be upda ted from Parent server . The child server will updated all other¶s PC
¶s attached w ith it .
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Use Any good Anti Virus
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eScan Version 10
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eScan Management Console
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Confidential Property
Presenting eScan Version 10
Intelligent & Faster
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Parental Control
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eConceal Firewall
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Confidential Property
Exciting New Features
Proactive Security
New User Friendly GUI
Parental Control
End Point Security
Faster On Demand Scans
Full Fledged Firewall
Registry Monitoring
Suspicious Application
Detection
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Reports
Block Games/Chat/Media Player/P2P Applications
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Password Protection with read only access
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eScan Version 10 - GUI
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eScan Protection Center
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Protection Center ± File AntiVirus
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Features include:
New File Monitor (intelligent and Faster)
MWL Scanning
Real-Time AV Scanning
Spyware, Adware, Keylogger, & Rootkit Blocker
Suspicious Application Detection
Registry Monitoring
File Anti-Virus : Features
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Protection Center ± Mail AntiVirus
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Features include:
Real-Time eMail Scan
Password Protected settings
Mail Anti-Virus : Features
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Protection Center ±Web AntiVirus
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Web Anti-Virus : Features
Features include:
Web/FTP/CHAT Scanning
Block websites with restricted words
Block web content (Multi-Media & Applications)
Block web applets, Cookies, Scripts
Privacy Protection / Browser Security
Block Pop-Ups
Time Restriction for Web access
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Protection Center ± End Point Security
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Features include: USB / Firewire Control
Application Control
End Point Security :
Features
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Protection Center ± Privacy Control
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Confidential Property
Features include:
Spyware & Keylogger Blocker
Privacy Protection / Browser Security
Block Pop-Ups
Privacy Control : Features
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Protection Center ± Anti Spam
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Protection Center ± Firewall
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Scan
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Scan
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Custom Scan Options
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Custom Scan Options (Cont.)
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Features include:
Heuristic Scanning
On Demand Scanning with Cache Technology
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How to Quick Scan Your System ?
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Scan your PC by MW AV
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eScan 10 Product Comparison
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eScan 10 Product Comparison Contd..
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Confidential Property
eScan 10 Product Comparison Contd..
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Confidential Property
eScan 10 Product Comparison Contd..
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eScan 10 Product Comparison Contd..
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