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