Malware Viruses Email Virus Worms Trojan Horses Spyware

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Malware Viruses E-mail Virus Worms Trojan Horses Spyware – Keystroke Loggers Adware

Malware Viruses E-mail Virus Worms Trojan Horses Spyware – Keystroke Loggers Adware

Viruses Segments of programs that attach to other programs When an “infected” program is

Viruses Segments of programs that attach to other programs When an “infected” program is run, the virus is run The virus seeks uninfected software and infects it Viruses can be spread to other computers through shared media or e-mail Can attach to Word documents, spreadsheets – anything which can have code Famous “boot-sector” virus on floppy disks

E-mail viruses Programs that are attached to e-mail messages When run attach themselves to

E-mail viruses Programs that are attached to e-mail messages When run attach themselves to programs May use address book to send messages to others using victim's return address May look like image files or text documents

Virus Defenses Anti-virus software Can check against a list of virus “signatures” Can look

Virus Defenses Anti-virus software Can check against a list of virus “signatures” Can look for suspicious activity Must be updated regularly Don't run programs from untrusted sources Digital signatures Shrink-wrapped software is not immune to viruses Informed users

Worms Program that propagate themselves through a network When a computer is infected, the

Worms Program that propagate themselves through a network When a computer is infected, the program runs and seeks out other computes to infect Often exploits bugs in software, especially network and web applications May use password attacks Famous example: Morris worm of 1998

Worm Defenses Keep software up-to-date, especially with security patches Firewall Monitoring software Use secure

Worm Defenses Keep software up-to-date, especially with security patches Firewall Monitoring software Use secure passwords Informed users

Trojan Horse A program that appears to do one thing, but really does another

Trojan Horse A program that appears to do one thing, but really does another May do both – legitimate and illegitimate functions Often found in games from untrusted sources Defenses: Don't download from untrusted sources Use source code

Spyware Programs that spy on you May collect personal information Can be used for

Spyware Programs that spy on you May collect personal information Can be used for identity theft Keystroke loggers monitor whatever is typed on the keyboard Information is sent via the internet to hacker's machine

Warheads Once control is gained of a computer, there are various malicious tasks that

Warheads Once control is gained of a computer, there are various malicious tasks that can be done: botnets steal personal information change information shut down virus protection and other safety features allow remote access to computer damage hardware

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