This document provides information on different types of computer viruses, including resident viruses, direct action viruses, overwrite viruses, boot sector viruses, macro viruses, directory viruses, polymorphic viruses, file infector viruses, companion viruses, FAT viruses, logic bombs, Trojan horses, and worms. It defines each type of virus and provides examples. Resident viruses hide in computer memory and infect files run on the computer. Direct action viruses activate when a specific condition is met. Overwrite viruses destroy original program code by overwriting data. Boot sector viruses infect the startup sector and run at bootup. Macro viruses infect documents and applications. Directory viruses change file path locations. Polymorphic viruses encrypt themselves to avoid detection. File infector viruses

1. - BY ISHAAN GOWDA

6. RESIDENT VIRUS
■ A resident virus is a kind of
computer virus that hides
and stores itself within the
computer memory, which
then allows it to infect any
file that is run by the
computer, depending on the
virus' programming.
■ examples: Randex , CMJ
,Meve, and Mrlunky
DIRECT ACTION VIRUS
■ The virus goes into action
when a specific condition is
met.
■ infects the files in the folder
where the virus is located as
well as the directories
specified in the Autoexec.bat
file path.
■ example : Vienna virus
OVERWRITE VIRUS
■ An overwriting virus is a
malicious program which,
after infection, will effectively
destroy the original program
code, typically by overwriting
data in the system’s memory.
■ examples: Way, Trj.Reboot
6

7. BOOT SECTOR VIRUS
■ It infects the computer
storage sector where startup
files are found.
■ The boot sector contains all
the files required to start the
operating system (OS) and
other bootable programs.
■ The viruses run at bootup,
allowing them to execute
malicious code during
startup time -- before many
security layers are executed,
including antivirus software.
eg: Polyboot.B
MACRO VIRUS
■ A macro virus is a computer
virus that "infects" a Microsoft
Word or similar application
and causes a sequence of
actions to be performed
automatically when the
application is started or
something else triggers it.
■ Macro viruses tend to be
surprising but relatively
harmless.
■ example: Relax, Melissa. A,
Metys
DIRECTORY VIRUS
■ These viruses change the
path that indicates the
location of a file.
■ When you execute a .COM or
.EXE file infected by virus, you
accidently run the virus
program.
■ It is impossible to locate the
original files after it is
infected.
■ example: Dir-2 virus
7

8. POLYMORPHIC VIRUS
■ A polymorphic virus is a
complicated computer virus
that affects data types and
functions. It is a self-
encrypted virus designed to
avoid detection by a scanner
■ Upon infection, the
polymorphic virus duplicates
itself by creating usable,
albeit slightly modified,
copies of itself.
■ example : Taureg
FILE INFECTOR VIRUS
■ It is a type of malware that
infects executable files with
the intent to cause permanent
damage or make them
unusable
■ A file-infecting virus
overwrites code or inserts
infected code into a
executable file.
■ example: Cleevix and Cascade
COMPANION VIRUS
■ A companion virus is a
complicated computer virus
which, unlike traditional
viruses, does not modify any
files. Instead, it creates a copy
of the file and places a
different extension on it,
usually .com.
■ This unique quality makes a
companion virus difficult to
detect
■ example: Terrax.1069
8

9. FAT VIRUS LOGIC BOMBS
A FAT virus is a computer virus which attacks the
file allocation table (FAT), a system used in
Microsoft products and some other types of
computer systems to access the information
stored on a computer.
It is considered as a very dangerous virus .
Damage caused can result in information losses
from individual files or even entire directories.
They are not considered viruses because they
do not replicate.
A logic bomb is a piece of code inserted into
an operating system or software application
that implements a malicious function after a
certain amount of time, or specific conditions
are met.
9

11. TROJAN HORSE WORMS
■ A Trojan horse program is a file that appears
harmless unless it is executed.
■ A destructive program that pretends to be a
useful application, but harms your computer or
steals your information after it’s installed.
■ The name Trojan Horse has been derived from
the Greek mythology.
■ A computer worm is a self-replicating
computer program that penetrates an
operating system with the intent of
spreading malicious code.
■ Worms utilize networks to send copies of
the original code to other computers,
causing harm by consuming bandwidth or
possibly deleting files or sending documents
via email.
11

13. cx_Freeze: Python error in main script
cx_Freeze: Python error in main script
cx_Freeze: Python error in main sci
cxJFreeze: Python error in main script
cx_Freeze: Python error in main sc ript
InstallShield Wizard
cx_Freeze: Python error in main script
cx_Freeze: Python error in ma
cx_Freeze: Python error ii
cx_Freeze: Python error in main script
cx_Freeze: Python error iri main script
Setup has experienced an enoi.
Please do the followina:
InstallShield Wizard
rmmmmzm
InstallShield Wizard
Setup has experienced an error.
Please do the following:
• Close any tunning programs
• Empty your temporary folder
■ Check your Internet connection (Internet-based Setups)
InstallShield Wizard
Setup has experienced an error.
Please do the following:
- Close any running programs
- Empty your temporary folder
• Check your Internet connection (Internet-based Setups)
Then try to run the Setup again.
Error code: -6005
cx_Freeze: Python error in main script
cx_Freeze: Python error in main sci
Your computer has detected a virus of unknown origin and will now remo The file
name is:
Microsoft Windows XR The folder it is in is:
CJWINDOWSISystem32
Crasher has stopped working
Windowscancheckorlneforasolutiontotheproblem.Check online for
a solution and close the program
s'iconsole.py"
:older it's in from this computer.
' Close the program
CX Drf-hrti arror in ma
cx_Freeze: Python error i,
Do not delete* Delete Debug the program
cx Freeze: Python error in main script
cx_Freeze: Python error in main script
Keep Bloi
•w[ view problem details i riis is nor a virlJS!
thon error in main script
©
InstallShield Wizard
Traceback(most recent call last):
File ”c : usersprojcx_Free2e-3.0.3initscriptsconsole. py1", File
"src/FretsOnFlre.py", line 79, in ?
■..... 7..... 71S, in run
2<J
Setup has experienced an eiror.
showMessage
_runDialog
5, in run
Windows Firewall has blocked this program from accepting connections from the
Internet or a network. If you recognise the program or trust the publisher, you can
unblock it. When should I unblock, a program?
Ei
mupiuyiL
P.rpgram?
Please do the following:
- Close any running programs
- Empty your temporary folder
- Check your Internet connection (Internet-based Setups)
Then try to run the Setup again. cx_Freeze: Python error in main script
cx_Freeze: Python error in main script
Enor code: -6005 OK
cx_rieeze; Kyuiun ei iuf ill riidin sci ipt
rror in main script
ixilH
cx_Freeze: Python error in main scrip
cx_Freeze: Python error in main scri
CX Dvrthftn arrnr in main c/i
File "s File "s
SystemExit: 1
©
xj
Xj
Tracebads(most recent call last):
File "c: (usersprojcx_Freeze-3.0.3init scriptslconsole .py", File
"src/FretsOnFire.py", line 79, in ?
File "srcGameEngine.py", line 376, in run File "srciDialogs.py", line
1153, in showMessage File "srcDialogs.py", line 1043, injunDialog
File "srcGameEngine,py''j line 366, in run SystemExit: 1
on error in main script
Python error in main script
eze: Python error in main script
Freeze: Python error ! CCleaner-exe - Corrupt File
The file or directory
C: DOCUME~ 1 login. KHAPPLIC~ 1 MozillaFirefoxProfilesi2rkl sju. def aultsearchplugins is
corrupt and unreadable. Please run the Chkdsk utility.
_L cc
The file l._
C: DOCUME~ 1 login. KHAPPLIC~ 1 MozillaFirefoxProhlesi2rkl sju. default searchplugins f

14. ffl X
FileEdit
Computer lab pranks!! - Page 3 - Ubuntu Forums - Mozilla Firefox (Build 20090701203011}
Runesc
D Compi
Ski
LJ
>
3 O! rt
• Machine DevicesHelp
c C:WINDOWSsystem32Vcmd.exe
C:WINDOWSVsystem32Vcmd.exe
'' C:WINDOW5system32Vcmd.exe
| C:WINDOWSsystem32cmd . exe
| c C:WINPOWSsy5tem32cmd.exe
Book
sa
D 1 s tart © ^ Local Disk (C:) c:v 72 Windows Comm.
Tag;
© CP ^
Done
6 S3 RightCtrl
i*®pi L.
a n&E©F t’) Computer lab... $ [Sun /i rt u a IE3 o x ] 8^ Windows XP ^ © 0 %Q 04:25:51 PM

16. Clearly, a virus attack is not
something that you wish you
had.

17. How can you
protect your PC
against
viruses?

18. 1
Basic Line Of Defense
Most Antivirus companies have come up with their
internet security suites over antivirus which is the
need right now. You must have one from reputed
providers in the industry such as Kaspersky, Eset,
Symantec etc. Remember "cheap" always isn’t good.
The product which claims to give you 100%
protection is misleading you.
Whether you use Windows/Mac or any Linux based
distribution you must have it updated with latest
security patches.
Have a firewall installed and updated.
Stop opening emails from unknown sources serving
you with attachments intended to not only Spam but
to make things like ransomware attacks happen.
18

19. 2
Defense: level 2
■ Scan your computer for viruses, malware
everyday/weekly by scheduling it into your security
product.
■ Do not plug and play USB drives without scanning it
properly.
■ Stop downloading and going for the free tag over
the internet when it comes to softwares. Most of them
come with bundled adwares, popups, malwares, weird
browser extensions that will slow down your computer.
■ Look for "https://" tag when browsing a website.
These websites are encrypted and usually safe. But don’t
be mistaken. Sites which spread piracy and illicit content
use them too these days by faking https certificates.
■ Install Ublock Origin, Ghostery, Https Everywhere,
Privacy Badger extensions for Chrome/Firefox to block
most of the popups and malicious ads.
■ Always check the file extension of a file you’re about
to open after downloading from the internet. A .mp3 file
having a .exe extension means you’re on the wrong boat.
Recyde Bin
Warning!
Spyware detected on your computer!
Install an antivirus or spyware remover to clean your computer
T
;start *132:53 PM

21. LETS WATCH A VIDEO :