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Modded binary immediately closes app?

al3xs7x

By al3xs7x
in Help & Support

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Go to solution Solved by Rook,

10 posts in this topic

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al3xs7x Newbie

al3xs7x 3
  •   iPhone SE (2020) 
  •   14.3

    • Posted
    Posted (edited)

    Hey, here's my typical app modding workflow:

    1. Decrypt .ipa using bfdecrypt (only decryption tool that works on Taurine 14.3, as far as i have found)
    2. Extract binary from new decrypted .ipa
    3. Thin it using lipo (only if it's multi arch binary)
    4. Fix permissions to 755/777
    5. Throw it in GHIDRA and start analyzing
    6. Manually apply mods/patches to binary using hex editor, and directly replace original one in app's bundle

    Now, for some reason, this game https://apps.apple.com/us/app/id938586035 immediately closes after modding. Actually, even without modding, after only first two steps, if i replace original binary with decrypted one, it refuses to start. Does anyone have an idea what it could be, it's a random free game, and i don't think it has to do something with some form of anti-piracy..

    Updated by al3xs7x
    • Solution
    Rook iOS God

    Rook 567.6k
  •   iPad Pro (2nd gen) 
  •   17.4
  • Donor
  •  

    • Posted
    • Solution
    Posted

    I can’t fully remember, but you may need AppSync installed and try running ldid -S on the binary.

    Laxus iOS God

    Laxus 823.6k
  •   iPhone 5s 
  •   10.3.3

    • Posted
    Posted
    39 minutes ago, al3xs7x said:

    I know, but it doesn't work on libhooker (Taurine). So you think it's bfdecrypt's fault?

    You need to fakesign the binary with ldid if using bfdecrypt

    al3xs7x Newbie

    al3xs7x 3
  •   iPhone SE (2020) 
  •   14.3

    • Posted
    • Author
    Posted (edited)
    52 minutes ago, Rook said:

    I can’t fully remember, but you may need AppSync installed and try running ldid -S on the binary.

     

    51 minutes ago, Laxus said:

    You need to fakesign the binary with ldid if using bfdecrypt

     

    Yes, i have AppSync Unified installed. I have never used ldid, do i use it on phone or pc?

    Updated by al3xs7x
    Rook iOS God

    Rook 567.6k
  •   iPad Pro (2nd gen) 
  •   17.4
  • Donor
  •  

    • Posted
    Posted
    2 minutes ago, al3xs7x said:

     

     

    Yes, i have AppSync Unified installed. I have never used ldid, do i use it on phone or pc?

    Device. Install Link Identity Editor from Cydia.

    al3xs7x Newbie

    al3xs7x 3
  •   iPhone SE (2020) 
  •   14.3

    • Posted
    • Author
    Posted (edited)

    ldid -S did the trick! Thanks! Is the sign universal, eg. will it work on other devices? I am planning to release some patches/mods, is ipa the best way, i guess releasing only patched binary and requiring of users to replace original one in bundle is stupid..?

    Updated by al3xs7x
    Rook iOS God

    Rook 567.6k
  •   iPad Pro (2nd gen) 
  •   17.4
  • Donor
  •  

    • Posted
    Posted
    1 hour ago, al3xs7x said:

    ldid -S did the trick! Thanks! Is the sign universal, eg. will it work on other devices? I am planning to release some patches/mods, is ipa the best way, i guess releasing only patched binary and requiring of users to replace original one in bundle is stupid..?

    I really don't remember. Binary modifications are a thing of the past, and we don't approve those anymore, unless you release as IPA. Then Sideloadly will take care of the signing.

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