Mod APKs: what they change and what they risk
A modified build has been resigned by someone other than the developer. That is the part that matters.
A "mod" is a game that has been decompiled, altered, and rebuilt. Whatever the alteration is, the rebuild is the security-relevant part.
Resigning breaks the chain
Android verifies that an update is signed with the same key as the installed app. A modified build cannot be signed with the developer's key, so it is signed with the modder's. From that point you are trusting whoever produced the build, not the developer — and updates from the official source will no longer install over it.
What gets added along the way
Because the package is being rebuilt anyway, additional code costs the modder nothing. Injected ad libraries and analytics are common; credential-stealing payloads are the less common but far worse case.
The practical position
We do not publish mods that bypass licensing or in-app purchases. Where a listing here is a modified build, it is labelled as one and states what it changes — so the choice is at least an informed one.
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