The glossary below contains many of the terms you will find in common use throughout the Symantec Security Response website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.


An executable file that, when run, "drops" a virus. A dropper file has the capability to create or run a virus and infect the user's system when it is executed. When a dropper file is scanned, the scan may not detect a true virus, because the viral code has not yet been created. The viral code (and virus) is created when the dropper file is executed. Heuristics scanning often detects droppers before regular scanner.