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Alert

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Virus.DOS.Alert or Alert is a virus that runs on MS-DOS. It is one of the first viruses that resemble a Rogue.

There are 2 different versions sharing the same name:

  • Virus.DOS.Alert
  • Virus.DOS.VCC.Alert.736

Behavior

Alert

This virus activates immediately and does not infect any file, but it would stay memory resident.

VCC.Alert.736

This is a non-memory resident virus, it infects all the DOS executables in current directory when run. It also activates immediately when an infected program is run.

Payload

Alert

This virus displays a ASCII art of the text in purple:

VIRUS
ALERT

It behaves differently under different version of the operating system.

Under version 6.22, if it is run for two times in row, the system halts. But when another program is run between the virus program's sections, no system halt would occur since the viral code has been unloaded from the memory.

Under version 7.1, if it is run for few times in row, the system would kill the process due to incorrect opcode to be executed, but the system does not halt at anyway. However it would still crash the system for many runs in row.

Additionally, after a number of executions, a lot of colored blocks of garbage characters may appear under the ASCII art payload.

VCC.Alert.736

When an infected program is run, the virus displays the following message, with a number of beeps and sound effects:

ALERT! ALERT!
 CALL YOUR SYSTEM ADMINISTRATOR!
 YOU HAVE A MAJOR SYSTEM PROBLEM
 BACKGROUND DIAGNOSTICS INDICATE
 YOUR HARDDRIVE IS LOSING TRACK 0
 This could make your data NOT RECOVERABLE!
 Please turn off your PC now and wait for
 further instructions.

And it continues to the host program.

Also, the virus does nothing harmful to the computer.

Other details

Alert contains the internal text string:

Please wait for the program to load..

VCC.Alert.736 contains the internal text strings:

Alert E Virus
Thespian
I-EAS Virus Creation Centre v0.19
[AE]
[TP]
[IE-VCC v0.19 ]
.COM

Videos

Virus.DOS00:48

Virus.DOS.Alert

Virus.DOS.Alert

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