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Certain Dynamic XVDs don't follow a predictable layout #1

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TorusHyperV opened this issue Oct 21, 2024 · 0 comments
Open

Certain Dynamic XVDs don't follow a predictable layout #1

TorusHyperV opened this issue Oct 21, 2024 · 0 comments
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bug Something isn't working good first issue Good for newcomers help wanted Extra attention is needed

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@TorusHyperV
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Certain OS XVDs of type Dynamic do not seem to follow a predictable layout. Most specifically, their Dynamic Header (a.k.a. BAT) region has a high entropy and does not look like a BAT at all. Attempts at parsing it as such yield nonsense.

Examples of these XVDs are:

  • era.xvd
  • gamecore.xvd
  • fr-fr.xvd (language packs from updates)
  • And probably a bunch of others

Example of entropy for fr-fr.xvd:
imagen

Example of a regular dynamic XVD (system_very_old.xvd):
imagen
system_very_old
@TorusHyperV TorusHyperV added bug Something isn't working good first issue Good for newcomers help wanted Extra attention is needed labels Oct 21, 2024
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