olemus
avastamise raskendamiseks harva käivituv viirus,
käivitub ainult teatud tingimustel, näiteks
- igal kümnendal faili avamisel
- teatud pikkusega failis
- teatud nimekomponendiga failis
=
virus that infects “occasionally”,
e.g. on every 10th program executed,
or only files that have a maximum size of 128kb.
These viruses use the conditions to
infect less often and therefore avoid detection.
They are also called sparse viruses.

näide
- Michelangelo