Bypass android app signature check part 1

August 1, 2023

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For demo we have this app here-

Let’s open the dex in dex editor plus you can also use apktool im using mt manager here.

Let’s try searching “;->signature“

Here we see 2 results let’s check in them for more info.

Here we see someting like a hash.

Here if we view the flowchart we can see it is geting the SHA1 hash and comparing

At this point it is geting the app SHA1 and comparing it
Now we will get the SHA1 from “META-INF/******.RSH/DSH” file

Now we will add a string the store the SHA1 in the string then retun the method value to the string

Now you can save the app and the siganture check will be bypassed for more info you can watch the video.

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