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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

Behavior

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 be infected incorrectly and could cause a system hang.

Payload

The virus randomly activates.

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 details

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

The virus contains the internal text string:

*.com

References

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

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