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Virus.DOS.Cookie, Japanese Cookie, Japanese_Xmas, or JapaneseCookie is a variant of the Japanese Christmas DOS virus. It is a very primitive virus, and is also benign.

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 get infected incorrectly and cause a system hang.

Payload

The virus activates by random.

When triggered, it displays the string "Cookie" across the screen with a beep, 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 cause a system hang before loading into memory.

The virus contains the internal text string:

*.com

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