South African Friday 13. (Sept.20,1989)
Entry...............: "South African Friday the 13th" virus
Alias(es)...........: Miami, Munich
Virus Strain........: 
Virus detected when.: 1987
              where.: South Africa
Classification......: .COM file infecting virus/Extending/Direct
Length of Virus.....: 419 bytes
--------------------- Preconditions ------------------------------------ 
Operating System(s).: MS-DOS
Version/Release.....: 2.0 or higher
Computer model(s)...: IBM PC,XT,AT and compatibles
--------------------- Attributes --------------------------------------- 
Easy Identification.: Text "INFECTED" found near start of virus.
Type of infection...: Virus adds itself to end of file and places a
                      three-byte jump at the beginning.
Infection Trigger...: When an infected file is run, it will infect every
                      .COM file in the current directory, with the excep-
                      tion of COMMAND.COM.
Storage media affected:
Interrupts hooked...: ---
Damage..............: Every infected file run on a Friday the 13th will
                      be deleted.
Damage Trigger......: Current date, as reported by DOS.
Particularities.....: ----
Similarities........: The effect is similar to that of other, unrelated
                      viruses. VIRUS-B is a modified variant of this 
                      virus.
--------------------- Agents -------------------------------------------
Countermeasures.....: All programs which check for .COM file length 
                      changes will detect infections.
                      Simply making all .COM files read-only is effective
                      against this virus.
Countermeasures successful:
                      Detection of infection: 
                           F-FCHK (from F.Skulason's F-PROT package)
                           VIRUSCAN
                      Removal:   F-FCHK
Standard means......: Write-protect every .COM file with "attrib +r *.COM".
--------------------- Acknowledgement ----------------------------------
Location............: University of Iceland/Computing Services
Classification by...: Fridrik Skulason  (frisk@rhi.hi.is)
Documentation by....: Fridrik Skulason
Date................: Sept 20, 1989
Information Source..: ---

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