How to decrpyt .dll or other files using Termux app (Root and ARM only, 5.0 and up)

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AndnixSH

Savage Lv6️⃣
SB Mod Squad ⭐
Member for 8 years
I have found a new way to decrypt .dll and other files using Termux. In this tutorial, I'll show you how to decrypt an encrypted .dll file

Requirements:
- Rooted device or Emulator. ARM or x86.
- A powerful Android device: 1 GB RAM, 4 cores, 1.5 - 2.x GHz. If you have a low-end device, your device may freeze during dumping.
- Available free space of Internal storage or Sdcard: 2 GB
- Requires Android 5.0 and up. Works on Marshmallow 6.0.1. Termux will not work on 4.4.4 and below.
- Termux app. It is avaliable on Play Store
- Modified Winhex for Windows (free version will not work for this purpose).
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Notes:
There is no need PIE patching. gdb 7.12 natively support Android 5.0 and up

If your device is running Kitkat 4.4.4 and below, please read the old tutorial: How to decrypt an encrypted .dll file

Using Android Emulator?
Termux and GDB fully support x86, but Termux only work on 5.0 and above due to system limitation, so you have to use the following emulator that have Lollipop 5.0 ROM and above

MEmu emulator running Lollipop CR5 (Recommended)
Download Lollipop RC5 ROM:
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How to setup Lollipop RC5 ROM: MEmu Android 5.1 RC5 is Released! - MEmu App Player

To transfer files to PC, just copy the file to /Sdcard/Download and the file will appear at C:\Users\<your name>\Downloads\MEmu Download\

You can change the shared folder in MEmu settings.

Remix OS player running Marshmallow
Download: Remix OS Player - The Most Advanced Android Game Emulator for PC.

AMIDuOS running Lollipop (30 day trail)
Download: Run Android on Windows - Fastest Android Emulator

I'm not sure if other emulators support shared folder. Just find it yourself.

Finding the package name of the app:
Find the package name of the app you're going to hack!
This will be required to find the app in the Terminal app we're going to use soon.
It's usually called "com.DEVELOPER_CODE.GAME_CODE".
You can find it going (with your browser) to the Google Play website, looking for the game you have installed on your device and then copying what's next to "id=".

See screenshot:



Alternatively, you can Install Package Name Viewer 2.0 from play store and you'll find the package name of any app you have installed on your device.



If your device is running Cyanogenmod/Lineage OS, you can go to Settings -> Apps and then you'll find the package name of any app you have installed on your device.



Termux setup and decryption:
Open Termux. It should be very similar to the following one:



Type the following commands:

Code:
apt update
Update package infomation
apt-get update
downloads the package lists from the repositories and "updates" them to get information on the newest versions of packages and their dependencies.

Code:
apt install gdb tsu
Install both gdb and tsu

gdb is a process debugger
tsu is a root mode for Termux.

Press the home button and launch the game. Let the game fully load.

Open multitask, and go back to Termux

Type the following commands:

Code:
su
Enter Superuser mode
Grant root access to enter superuser mode for your device when asked.

Code:
dumpsys meminfo | grep com*
Show process list

This command will search for all the running processes starting with "com." (the * is a jolly symbol which means any letter/number/symbol). The package name of the game is always at top. Don't forget to write it down



Code:
exit
Exit Superuser mode

Code:
tsu
Enter root mode for Termux

Code:
gdb -pid <pid>
attach a process with gdb

Example:
Code:
gdb -pid 12345
Hit return to continue when asked.

Do not worry about any warnings like these you may read in the Terminal app:



Code:
gcore <path>
save core file

Example:
Code:
gcore /sdcard/thegametodump
Type Y when asked

This will take 3-5 minutes. You device may freeze during dumping. Do not touch your device.

Code:
quit
quit gdb
And deattach the process when asked

Or you can exit Termux session from notification



Connect your device to your computer and copy your dumped file, if the file does not appear, just create a folder and move the file. This way Windows should be able to see it

Recover decrypted files using WinHex:
Open Winhex.exe

File -> Open... and select a dumped file

Tools -> Disk Tools -> File Recovery by Type



Click the "+" next to "Programs" (1) and check "Windows exec." (2). Now, select the folder where you want the new file to be generated under "Output Folder" (3).

Ensure "Complere byte-level search" is checked (4) and then click "OK" (5).



The file recover will now begin and, when it finished you'll get a message like this:



Now, reach the location where you saved this file and delete all files with the ".com" extension. They're not needed and may only cause confusion.

You can finally close WinHex.

Happy modding!

Credits:
iAndroHacker
Fredrik (Termux app)

Who want gdb gcore to work on emulator? do you got "Target does not support core file generation"? please help me force this dev to solve gcore problem for x86 by commenting at https://github.com/termux/termux-packages/issues/942
 
Last edited:

s810car

In Love Lv4️⃣
Member for 7 years
Re: Decrpyting an encrypted .dll and other files using Termux app (Root only) (5.0 and up)

Nice one, just curious though why termux and not some random terminal app, just for the apt-get? just trying to see what is much different from the last tutorial esp since now old one is KK and below amd this one LP up
 

antonio

In Love Lv4️⃣
✔ Approved Releaser
Member for 7 years
Re: Decrpyting an encrypted .dll and other files using Termux app (Root only) (5.0 and up)

great tutorial thanks iandroidHacker
 

cissamannen

APK Fanatic Lv5️⃣
VIP
✔ Approved Releaser
Member for 8 years
Re: Decrpyting an encrypted .dll and other files using Termux app (Root only) (5.0 and up)

Fantasti!!!!


EDIT: I have one game that force closes when it tries to attach to the process. It has 2 pids. 1 with activities 200mb memory, and 1 without activities, at 6mb memory usage.

Whem trying to attach to tje activities one, lt says its used by the other pid.. If i try to attach to that one, it force closes the game, and says no process attached. So cant dump info :/

Im on 7.0 nougat btw :p
 

AndnixSH

Savage Lv6️⃣
SB Mod Squad ⭐
Member for 8 years
Re: Decrpyting an encrypted .dll and other files using Termux app (Root only) (5.0 and up)

Fantasti!!!!


EDIT: I have one game that force closes when it tries to attach to the process. It has 2 pids. 1 with activities 200mb memory, and 1 without activities, at 6mb memory usage.

Whem trying to attach to tje activities one, lt says its used by the other pid.. If i try to attach to that one, it force closes the game, and says no process attached. So cant dump info :/

Im on 7.0 nougat btw :p
Can you tell me the name of the game?
 

Kwame

Lurker Lv0️⃣
Member for 5 years
Nice tutorial
Post automatically merged:

Nice tutorial
 
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