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[Solved] Help needed with extracting the audio from an iOS app (slrpnk.net)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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Edit 2: Well I'll be damned. An extremely knowledgeable and kind stranger just reverse-engineered the whole thing and poured it into a python script. And it's only Monday. See comments for the script.

Edit: Oh wow, this community is already on fire. Thanks for your advice everybody, I didn't even think of intercepting the downloads in transit! Brilliant.

I will try to see how far I can get there, but that does sound much easier than rummaging around in iOS. Thank you all :)

Hello,

I’m trying to get the downloaded audio out of an iOS app, but I struggle because the information I can find is mostly rather old, needs some additional software I need to pay for, etc. The content is downloaded post installing the app, so simply accessing the IPA doesn’t help.

I have this app called naturespace (see naturespace.org), it’s an app that has really good recordings of rain, thunderstorms, etc. In my opinion those recordings are far better than anything I’ve heard so far.

Now, I did pay for the content, but the app hasn’t been updated for years now, and there’s also been no new content for years as well. I wrote to the owners but didn’t get any response. I guess you could consider it abandoned at this point.

Since I fear that anytime soon the app stops working, I’d like to save that content.

I’m a bit tech savvy, I can work with CLI and such, but I’m not a professional coder or hacker, any help is appreciated.

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[–] [email protected] 1 points 1 year ago

If the content is being downloaded then you could do the following:

Setup a proxy like Fiddler2 on a PC on the same network your phone is connected to. You’ll need to configure Fiddler2 to decrypt HTTPS and then access the proxy certificate on your iPhone and add it as a trusted certificate. You’ll need to Google how to do this with Fiddler2 but it’s not hard
Configure your iPhone to connect through the Fiddler2 proxy by modifying your WiFi settings. If your PC is allowing connections to the Fiddler2 proxy port (e.g. 8888) and you’re trusted the cert on your iPhone, then connecting to websites in safari should be working
Open the naturespace app on your iPhone and delete the sounds you’re interested in. ONLY do this if you’re sure you can still re-download them. If not, this whole approach won’t work so just stop here.
Download the sounds again

You should then be able to see the web requests that were made to download the sounds in Fiddler2 on your PC. As long as there’s no fancy encryption, you should be able to just save the content out of Fiddler2.