and Bagle seemed to enter a war to determine who could capture the most email addresses <td

for example)

• Modify system file • Modify ordinary executable program

Conceal self • Intercept system calls that would reveal self and falsify result

• Classify self as “hidden” file Spread infection • Infect boot sector

• Infect systems program • Infect ordinary program • Infect data ordinary program reads to

control its execution Prevent deactivation • Activate before deactivating program and

block deactivation • Store copy to reinfect after deactivation

· Virus Effect

How It Is Caused

Attach to executable

program

· Modify file directory

· Write to executable program file

Attach to data or

control file

· Modify directory

· Rewrite data

· Append to data

· Append data to self

Remain in memory

· Intercept interrupt by modifying interrupt

handler address table

· Load self in non-transient memory area

Infect disks

· Intercept interrupt

· Intercept operating system call (to format

disk

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