virus technology

7/30/2019 Virus Technology

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SUBMITTED BYZamirahmed (08CE216)

GANDHINAGAR INSTITUTE OF

TECNOLOGY


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INDEX

1. Introduction of Malicious Programs.2. Introduction of Virus

3. Types of Viruses.

4. Structure Of Virus5. Working style of Virus.

6. Symptoms Of virus infecting.

7. How it spreads so quickly.

8. Example-Bugfee,Cascade(Virus)9. Limitations of Anti-Viruses.

10. Conclusion.

11. Bibliography


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What is Computer Virus ?

File :- (1)Courrpt installed Softwares

(2)Avoid Detection

(3)Infect Files


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Classification Of Virus

Viruses

BootSector

Viruses

MultipartieViruses

Floppy

Disk Boot

Sector

Viruses

Hard Disk

Master

Boot

Record

(MBR)/

Partition

TableViruses

Polymorphic

Viruses

StealthViruses

File/ProgramViruses

MacroViruses


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File/Program Viruses

Purpose:- To infect installed Program

and system files.Speciality:-They load viruses into memory.

Examples:-Sunday,Cascade


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Boot Sector Viruses

Types :- (1)Floppy Disk Boot Sector Viruses

(2) Hard Disk Master Boot Record(MBR)/ Partition Table Viruses

Speciality:-It copies the master boot record to

another place or overwrites on it.


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Multipartite Viruses

Hybrid Varity-combination of boot virus

and file Program, virus.

First it goes to master boot program .then it

replaces or overwrites it and then start infecting

files.


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Stealth Viruses

Very latest viruses. they HIDE itself. They

sometimes REMOVES temporarythemselves to

avoid to be detected.(Compression)


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Macro Viruses

A set of many destructive instructions made in VB.

(Visual Basic).They are email fileattachments.

For a macro viruses to infect a system, the

document with the embedded VB code, must be

opened.


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Polymorphic Viruses

Most Difficult to detect. it makes copies

of it in registry. so the whole system is being

infected by this virus.


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Structure of VirusProgram V:=

{goto main;

123456;

subroutine infect-executable:=

{loop:

file:=get-random-executable-file;

if(first-line-of-file=123456)

then goto loop

else pretend V to file:}subroutine do-damage:=

{whatever damage is to be done}

subroutine trigger-pulled:=

{stop infecting}

Main: main program:={infect-executable;

if trigger-pulled then do damage;

goto next;}

Next:

}


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HOW DOES VIRUS WORKS

Enter by email,downloads,floppy disk or hacking

Then make copies of itself to spread.

They will wait for the signal for being activated.


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HOW VIRUSES SPREAD SO

QUICKLY ?

The code written to create a virus is responsible to sprea

the virus in a particular system.

Portable Storage devices

Internet


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BUGFEEVIRUS

A love letter which is e-mail attachments.

Infection :-

Difficult to open Media files

Difficult to open .jpg , .bmp , .gif etc


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CASCADE Virus


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Working Of Cascade Virus

(1)It hides our drives.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\

Dword-NoDrives:=1(2)It locks our window registry.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

DisableRegistrytools:=1(3)Its two attachments deletes *.dll and *.sys

files.


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LIMITATIONS OF ANTI-VIRUS

PROGRAMS

Trial Versions.

old version cant detect.

License version are so costly.

Regular you have to take virus definitions.


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CONCLUSION

While using diff. External Data storage devices like cds,

floppy disk scan all the devices using latest updated

anti-virus.

PREVENTION IS ALLWAYES BETTER THAN CURE.


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BIBLIOGRAPHY

Book :- An Unofficial Guide of Ethical Hacking

Author :- Ankit Fadia

Url:- www.fadia.com

www.hackingmobilephones.com
http://localhost/var/www/apps/conversion/tmp/scratch_2/-http://localhost/var/www/apps/conversion/tmp/scratch_2/-http://localhost/var/www/apps/conversion/tmp/scratch_2/-


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