[My friend] didn't really take to the security guard thing, so he answered an ad at Malabar looking for a packer and
unpacker in the Opera Department," Begoray recalls.
The limitation of this approach is that it needs a specific
unpacker for each packer, and moreover, only viruses packed with known packers can be unpacked and detected.
A packed binary contains a payload of encrypted or compressed original code that during execution will be unpacked with the
unpacker routine into its address space at run-time.
Usually I'm a prompt
unpacker. But for some reason, I let the Paris suitcase I brought back home sit unopened for almost a week before, with a strange reluctance, I made myself unzip the lid and look inside.
An entirely new Siemens S7 control system regulates all the bottle conveyors between the
unpacker and the packer including integration of the existing machines and conveyor systems.
Since every packer has its associated
unpacker to undo packing, a successful generic
unpacker is difficult to come by [7].
A very good example of such targets is that given to the operator in charge of the
unpacker machine.