Virus.DOS.Zerobug.1536.a or Zerobug is a virus that runs on MS-DOS.
When a file infected with Zerobug is executed, the virus uses the COSMPEC variable to look for COMMAND.COM. If it finds COMMAND.COM, it will infect files from directly from there. If not, the virus becomes memory resident. The virus prepends its 1,536 bytes to every .com file run. In a manner similar to Vienna, the virus marks infected files with the number 62 in the seconds field of the file's timestamp. After a certain amount of time, the virus will replace any "0" displayed on the screen will be replaced by an ASCII smiley face (ASCII character 01).
When a file infected with Zerobug is executed, the virus uses the COSMPEC variable to look for COMMAND.COM. If it finds COMMAND.COM, it will infect files from directly from there. If not, the virus becomes memory resident. The virus prepends its 1,536 bytes to every .com file run. In a manner similar to Vienna, the virus marks infected files with the number 62 in the seconds field of the file's timestamp. After a certain amount of time, the virus will replace any "0" displayed on the screen will be replaced by an ASCII smiley face (ASCII character 01). The "DIR" command shows the infected files with their original sizes.
Virus.DOS.Zerobug.1536.a or Zerobug is a virus that runs on MS-DOS.