In this publication about Metamorphic viruses i have found this classification:
Metamorphic malware may be either a binary-transformer or an alternate-representation-transformer. The former class transforms the binary image that is executed, whereas the latter class carries its code in a higher level representation, which is used for transformation.
I did not found a precise definition of these two terms. I would like to know if is there a generic definition for each one, or a generic context to introduce the classification in my dissertation.
Thanks all.