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Encyclopedia GetVirusCard True 0

Jerusalem.B

 
Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Jerusalem.B
Technical name:Jerusalem B Family
Threat level:Low
Alias:Viernes 13
Type:Virus
Effects:  It activates on Friday 13th and deletes all the files that are run.

Affected platforms:

MS-DOS

Detection updated on:Jan. 1, 1991
StatisticsNo
Country of origin:ISRAEL

Brief Description 

    

Jerusalem.B is a resident virus that infects files with an EXESYS and COM extension. This virus is activated when the date on the system clock is Friday 13th and it deletes all files run on the computer.

Jerusalem.B increases the size of infected files. The size of a file increases every time the infected file is run. It can also cause the computer to slow down.

Jerusalem.B does not use any specific means to spread. It can reach computers through the usual means used by viruses: Internet downloads, floppy disks, FTP, etc.

Visible Symptoms 

    

Jerusalem.B is difficult to identify, as it does not display any messages or warnings that indicate that it has infected a computer.