[Groop] downloading e-groo

chris.emmett at hsbcib.com chris.emmett at hsbcib.com
Wed Jun 13 01:49:30 PDT 2007

Hi Groop
A jpg image, for instance, has a structure definition that allows for
picture sections, info sections and other user defined sections all linked
from a header table (IIRC) so you can place malicious code in the "other"
section. Normally this would do nothing because your image viewer ignores
it. However, some applications see these pieces of code and try to
interpret them i.e. execute them. I think that IE had this problem a while
back. As so often is the case, the virus requires help from a user or an
over-helpful application in order to execute.
(I'm sure there must be a serious technical write up of this somewhere but
I don't have it :-)

(Who once worked on a jpg conversion app)

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