Virus.DOS.Mabuhay is a memory resident parasitic encrypted virus on DOS. The virus appears to have a Phillippines flag.

There are 7 variants:

  • Virus.DOS.Mabuhay.1908
  • Virus.DOS.Mabuhay.2660 (A, B and C)
  • Virus.DOS.Mabuhay.2695
  • Virus.DOS.Mabuhay.4260


When the virus is loaded into memory, it hoots INT 21h to infect any executable that is run by writing itself to the end of the file, excluding COMMAND.COM.

This virus is seemed to be modified from Jerusalem.


The virus activates on June 12th, it displays the national flag of Philippines and plays the tune of the national anthem Lupang Hinirang, the Philippines:

June 12 - the Independence Day of the Philippines.


Dedicated to Manong Eddie.

It also displays the message:

ANTI-Southern Phil. Council 4 Peace N' Development


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