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COMPUTER VIRUSES

COMPUTER VIRUSES. By Gobetti Andrea & Salvestrini Luca. HISTORY OF VIRUSES. Virus appeared in 1988 on Machintosh. In 1989 appeared on IBM/MS-DOS systems. STRUCTURE OF A VIRUS. The virus is written to self-replicate. Two parts : replication engine and payload.

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COMPUTER VIRUSES

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  1. COMPUTER VIRUSES By Gobetti Andrea & Salvestrini Luca

  2. HISTORY OF VIRUSES Virus appeared in 1988 on Machintosh In 1989 appeared on IBM/MS-DOS systems.

  3. STRUCTURE OF A VIRUS The virus iswritten to self-replicate Twoparts: replicationengine and payload The originisexternal to the computer

  4. TYPES OF VIRUS • File infectors • Boot-recorsinfectors • Macro viruses • Trojanhorses • Worms • LogicBombs

  5. MACRO VIRUSES Infectusingmacro utilities Application-specific Notspecific to OS

  6. WORMS (rabbits) Resides in activememory (RAM) • Network worms: • differentsegments • Onecoordinates the others (octopuses) • Sendcopies via e-mail or IRC

  7. LOGIC BOMBS Wait for a trigger Can be used by ethical hackers

  8. TROJAN HORSES Looks a useful software butit’s a virus Can also be a spyware Can create back doors • Composed by twoparts: • Client part on the attackersystem • Server part on the victimsystem

  9. VLADIMIR VETROV(1928-1985) He was a KGB spy butworkedalso for the NATO (double agent) Code namedFarwell by the french intelligence service The soviet union needed computer control systemsfor the trans-Siberian gas pipelinetrojanned software > largest non-nuclearexplosionever

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