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Virus.DOS.Cookie, also referred as Japanese Cookie, is a parasitic virus on DOS.

There are 2 variants:

  • Virus.DOS.Cookie.653
  • Virus.DOS.Cookie.722

BehaviorEdit

When the virus is run, it infects one DOS executable in current directory by random, including COMMAND.COM.

Files larger than 30,720 bytes may get infected incorrectly and cause a system hang.

PayloadEdit

The virus activates by random.

When triggered, it displays the string "Cookie" across the screen with a beep repeatedly, followed by spamming the screen with the text string after a while:

Give me a Cookie

And it waits for the user to input "Cookie" by exact cases. Once detected it stops spamming, displays the message and return to DOS:

Oh Thank you!

Other detailsEdit

Cookie.722 contains bug that would hang the system on attempting to load into memory.

The virus contains the internal text string:

*.com

ReferencesEdit

  1. List of variants of the Japanese Cookie virus on VX Heaven

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