olemus
DOS-viirus, mis põhineb võimalusel
korrata failinime teistsuguse laiendiga,
loob algsest failist ja sellele lisatud viirusest
uue faili, teistsuguse laiendiga
=
a type of virus that poses as a legitimate file by copying its file name but uses a different extension; it doesn't modify files

ülevaateid
https://www.youtube.com/watch?v=Qx7MoIhS-7Y

https://www.techopedia.com/definition/46/companion-virus

http://botcrawl.com/remove-companion-adware/

näiteid:
- Asimov.1539 (1998)
https://www.sophos.com/en-us/threat-center/threat-analyses/viruses-and-spyware/Asimov-1539.aspx
- Stator (2001)
http://www.pcqanda.com/dc/dcboard.php?az=printer_friendly&forum=2&topic_id=96352&mesg_id=96354
- Terrax.1096 (2006)