olemus
viirus, mis kohe laadib end mällu, aktiveerub
ja seejärel vabastab mälu
=
a non-resident virus selecting one or more files to infect each time the code is executed

ülevaateid
http://www.spamlaws.com/direct-action-virus.html

https://www.internetsecurity.tips/direct-action-virus-safety-and-prevention-tips/

näiteid:
Vienna (1988)
http://virus.wikidot.com/vienna
VCL.428 (1996)
https://www.rankred.com/types-of-computer-viruses/
Rugrat (2004)
https://www.slideshare.net/UltraUploader/64-bit-rugrats-50652946