ZenHAX

@Firecube: It's not an easy task either and involving debugging mobile app with graphics debuggers (also, maybe there is simpler method to do so engine-wise). Still, it's easier than reverse-engineering paks format, especially with encrypted index.

Also, since only index is obfuscated or encrypted in those paks, but not files themselves, you can extract raw chunks from any pak with offzip ("offzip -a your.pak output_folder") and then merge them, following known UE4 assets patterns. For example, there will be 01.uasset, 02.dat, 03.dat, 04.uasset, 05.dat and so on. Here 01.uasset is a header and 02.dat/03.dat are parts of that uasset or ubulk. So, merging 01+02+03 into one uasset will get you one working asset (probably, because there are also headerless ubulk files).
But this approach is not effective at all, because there are many assets types out there and total amount of assets can be 10k+ easily.

In any case, you can't get anything from those paks, since devs not only xor'ed index, but also obfuscated its offset and size - that means you must r-e libUE4.so library to find out what they did there. Alternatively, I think it's possible to find out index's offset and size for every pak manually and extract them with modified bms script.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

• Engine: UE 4.22 (Should be)
• Available on iOS and Android.
• No shipping.exe (Might be a problem for encryption grabbing dont know).
• I do have the paks from iOS as I'm jailbroken and can file tamper. Just let me know if you need them.

If anyone has the time to crack it, would be appreciated cheers!

I've noticed that PUBG Lite still have the same format as mobile version before (not encrypted, but with xor'ed index). For some reason pubg_mobile-extract script doesn't work with it, so here is working script for quickbms. Tested on latest version at the moment.

You can find the script in this post.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

Hi spirtovod please my names is sarah Aes key
.

Key:0x42163963B2E095A8D673B48B703B6DE016FE4DC36E0796CC14531C8DAE87E4BC
Download link：https://object.blue-protocol.com/setup/qe1MU2mMQlsRLDnpwby33hXq/BLUEPROTOCOL_Setup.exe

AES Keys?
If anyone needs to get keys on newer games (UE4 versions 4.19 and above), try the tool in my signature.
Hope it can be of help to people looking for keys.
Good luck!

_________________
If you appreciate my work and want to donate:
Paypal: ghfear@hotmail.com

AES Key Finder 1.9: https://zenhax.com/viewtopic.php?f=17&t=9407&start=20

. Thanks bro good work.

Can this work for UE4 android game?

Not yet. Perhaps in the future.

_________________
If you appreciate my work and want to donate:
Paypal: ghfear@hotmail.com

AES Key Finder 1.9: https://zenhax.com/viewtopic.php?f=17&t=9407&start=20

HOW CAN I MARGE EXTRACTED FILES ?

Can anyone help me with this ?

@TGGAMING: You're trying to extract mobile version with lite script, but they are not compatible.
And if you don't know how to merge files, google will help you (any hex editor will do). Anyway, if you don't know about internal structure of different UE4 assets, that method is of no use to your. It was just observation and it's not really useful way to explore pak contents.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

Wrote some POC for aes keys finder (one exe -> one key or not found). JRE 8 or above is required to run it. Readme is included in the archive (please read it carefully to avoid issues). Virustotal report for those who care: link.
Bleeding Edge is supported, unless they'll change something related in the code. Last Oasis is also supported in version 0.9c. Finder can detect protected games starting from version 0.9d. Small fixes in version 0.9e. Additional message in case if a key is not found in version 0.9f.

Update 14.07.2020:
POC for aes keys finder in mobile games added (one game -> one key or not found). JRE 8 or above is required to run it. Readme is included in the archive (please read it carefully to avoid issues). Virustotal report for those who care: link.
Fixed premature appearance of key.txt, fixed issue when finder could work more than expected, added total execution time to output message in version 0.9c. Some optimizations were removed to improve compatibility with newest games in version 0.9d. More optimizations were removed to improve compatibility with some old games in version 0.9e (previous version is recommended though).

Known unsupported games: PUBG (all versions), Sea of Thieves.

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I've desided to move all modified scripts to one post (this one). The reason why they can't be merged is because currently there is no way to distinguish them by archives names. Current method with scanning folder name for a pattern is not very effective, since pak archives can be moved anywhere.

Original post with modified script by ssh: viewtopic.php?t=1005&start=1200#p51805 (0.4.23.1a).
Latest official version of the script by aluigi: http://aluigi.org/bms/unreal_tournament_4.bms (0.4.25 at the moment).
Script with v9 paks support (for 4.25 games and below) - "latest_UE4_bms-script" in the attachment. Updated on 26.12.2020 to properly support base paths from mount points if present. Updated on 26.02.2021 to support auto-detection of compression types - therefore some scripts from specific scripts bundle were removed, because updated main script can handle those games now.
Script with v11 paks support (for 4.26 games) - "unreal_tournament_4_0.4.26_paks_only" in the attachment. It's not backward compatible with 4.25 games, because it's a temporary solution. Also, it only supports paks at the moment, but utoc/ucas support may be added later. Updated on 16.01.2021 to properly support files over 4GB. Updated on 23.04.2021 with ability to skip assets which are being addressed outside currect package. Updated on 02.05.2021 with auto-detection of compression types and small fixes.

Supported games (with specific scripts): Sea of Thieves, State of Decay 2 (latest versions), PUBG Lite, PUBG Mobile/Mobile Lite (only for 1.1.x and below), PUBG Mobile (chinese ver.), Friday 13th Game, Bless Mobile, Dragon Quest XI - also works with S edition, Days Gone [removed, use latest_UE4_bms-script], Tony Hawk's Pro Skater 1+2 (demo only) [removed, use latest_UE4_bms-script], Pinball Wicked (thanks to pipopipo/pipoman), Conan Exiles, Tekken 7, Fable Legends, Pathless [removed, use latest_UE4_bms-script], Beyond a Steel Sky [removed, use latest_UE4_bms-script], Bravely Default 2 [removed, use latest_UE4_bms-script], Outriders (thanks to mobus_c352), Century: Age of Ashes, Miracle 2, Scavengers.

Sound extraction (readme included): Satisfactory (latest versions), R-Type Final 2.

Some unrelated scripts for UE4 games: for save files from Life is Strange 2 (link), for "paka" from Kingdoms Reborn (link), modified u4pak for creating Dragon Quest XI compatible packages (link), for decrypting/encrypting and converting save files from Dragon Quest XI S (link).

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Some experimental scripts are now available in custom_UE4_scripts bundle. For more info please read included readme.

1) custom_extract: Provides the same functionality as native filter of quickbms, but on the script level. Created more for research purposes, but may be helpful in some cases.
2) get_hashes: Allow you to extract hashes (actually guids) and filenames of all assets from a pak. Resulted file can be used with extract_diff script.
3) extract_diff: Allow you to compare paks from different game versions and extract or list only new/updated files.
4) raw_extract: Allow you to extract raw assets from paks, if index is not available or obfuscated. That means you can extract all files, but without proper filenames.

Basically, get hashes from pak of the old game version, put them near pak of updated game version and extract or list new/updated files. There are additional options in the extract_diff script, but no backward compatibility yet (for example, you can't guess, which files were completely removed in the updated game version). Please note that those scripts are very experimental and may have some bugs/limitations.

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How to repack assets back in form of mods:

It was already explained multiple times here and there. Please read some related posts before asking about it: first post, second post (and base instruction, part 3.10.1). Alternatively, you can use instruction by masagrator (it works for PC games as well), which is mentioned in the posts above.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

Awesome stuff spiritovod!

Really nice :]
This will help a lot of people.

_________________
If you appreciate my work and want to donate:
Paypal: ghfear@hotmail.com

AES Key Finder 1.9: https://zenhax.com/viewtopic.php?f=17&t=9407&start=20

^ Thanks. The only downside is that the list with keys will not be updated frequently like before. I encourage all people using GHFear's or my key finders to post their results if that key is not present in the list or outdated there. It will be especially helpful in case of protected games (like UWP games).

Anyway, now I'm looking into aes keys in mobile games built with UE4. If you know any such game with known or unknown keys, let me know. The games I'm already aware of: M.A.D. 8 (key known), Injustice 2 Mobile (key known), Dead by Daylight (key unknown), Traha (key unknown), Bless Mobile (key unknown), Blade And Soul Revolution (key known) and Blade II (key known). If you'll mention some asian games which are hard to get, you can also PM me lib\arm64-xxx\libUE4.so from extracted apk, and a sample pak. Can't promise anything though, because it's more for research purposes at the moment, but it will be appreciated.
I know a little about that stuff, but it's probably good exercise for neural networks / deep learning devs, considering specifics of that "brute-force" approach to keys.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

@spiritovod
I would like to try a method that allows things to be shown in runtime, and I think it requires some values. What is the way to do this?

Hi, for Dungeon Defenders Awakened, they have recently updated the game, but the current key (0x4FFEC9593990380FF7987674CD6CCC408EC4EEFFB79920C6137919C4F268A09F) doesn't work with unreal_tournament_4_0.4.23.1a.bms anymore as it gives the following:

Error: incomplete input file -10:
       Can't read 5 bytes from offset 00000000004c1450.
       Anyway don't worry, it's possible that the BMS script has been written
       to exit in this way if it's reached the end of the archive so check it
       or contact its author or verify that all the files have been extracted.
       Please check the following coverage information to know if it's ok.

  coverage file -10 100%   4985936    4985936    . offset 00000000004c1450

Last script line before the error or that produced the error:
  153 get CHUNK_END_OFFSET longlong TOC_FILE

I have also tried using the AES key finders but they do not find a match.

Here is the latest shipping exe https://mega.nz/file/5MMXhSTK#mQO6Tcgpk ... OJu0NooR4g

I would appreciate if anyone could help.

@Vaziayu: You either have more than one exe besides AES_finder in the same folder (it can't handle more than one game exe at a time) or you forgot to remove steam protection from the exe. Just tested my finder and it works just fine. Next time please read included readme carefully.

@TGGAMING: It has been already explained before that it's not an easy task, and there is no complete guide about how to it as well. And I'm not going to write such guide too.

_________________
You can request AES keys on rin forums (the list with keys is also there)
AES keys finder and latest UE4 bms scripts: in this post

I see the part saying about Steamless now, I seemed to have skimmed past it interpreting it as part of the Java runtime requirement, my apologies and thanks for your help.