Obfuscation always returning non-zero exit status 255.

[bluecatpixel]

Hi.

I'm trying to obfuscate an. apk that is signed and process always returns non-zero exit status 255.

I suspect that I'm doing it the wrong way.

sudo docker run --rm -it -u $(id -u):$(id -g) -v "${PWD}":"/workdir" obfuscapk -o RandomManifest -o Rebuild -o NewAlignment -o NewSignature original.apk -p --keystore-file XXXX.key --keystore-password PASS --key-alias PASS --key-password PASS

The result is always this:

Traceback (most recent call last): File "/Obfuscapk/obfuscapk/main.py", line 153, in perform_obfuscation (obfuscator_name_to_function[obfuscator_name])(obfuscation) File "/Obfuscapk/obfuscapk/obfuscators/new_alignment/new_alignment.py", line 20, in obfuscate obfuscation_info.align_obfuscated_apk() File "/Obfuscapk/obfuscapk/obfuscation.py", line 620, in align_obfuscated_apk zipalign.align(self.obfuscated_apk_path) File "/Obfuscapk/obfuscapk/tool.py", line 247, in align output = subprocess.check_output( File "/usr/local/lib/python3.10/subprocess.py", line 420, in check_output return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, File "/usr/local/lib/python3.10/subprocess.py", line 524, in run raise CalledProcessError(retcode, process.args, subprocess.CalledProcessError: Command '['/android-sdk-linux/build-tools/32.0.0/zipalign', '-p', '-v', '-f', '4', 'obfuscation_working_dir/original_obfuscated.copy.apk', 'obfuscation_working_dir/original_obfuscated.apk']' returned non-zero exit status 255. Traceback (most recent call last): File "/usr/local/lib/python3.10/runpy.py", line 196, in _run_module_as_main return _run_code(code, main_globals, None, File "/usr/local/lib/python3.10/runpy.py", line 86, in _run_code exec(code, run_globals) File "/Obfuscapk/obfuscapk/cli.py", line 189, in <module> main() File "/Obfuscapk/obfuscapk/cli.py", line 171, in main perform_obfuscation( File "/Obfuscapk/obfuscapk/main.py", line 153, in perform_obfuscation (obfuscator_name_to_function[obfuscator_name])(obfuscation) File "/Obfuscapk/obfuscapk/obfuscators/new_alignment/new_alignment.py", line 20, in obfuscate obfuscation_info.align_obfuscated_apk() File "/Obfuscapk/obfuscapk/obfuscation.py", line 620, in align_obfuscated_apk zipalign.align(self.obfuscated_apk_path) File "/Obfuscapk/obfuscapk/tool.py", line 247, in align output = subprocess.check_output( File "/usr/local/lib/python3.10/subprocess.py", line 420, in check_output return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, File "/usr/local/lib/python3.10/subprocess.py", line 524, in run raise CalledProcessError(retcode, process.args, subprocess.CalledProcessError: Command '['/android-sdk-linux/build-tools/32.0.0/zipalign', '-p', '-v', '-f', '4', 'obfuscation_working_dir/original_obfuscated.copy.apk', 'obfuscation_working_dir/original_obfuscated.apk']' returned non-zero exit status 255.

What I'm doing wrong?

Thanks in advance Jose

[ClaudiuGeorgiu]

Hi, this is an interesting error that I haven't seen before. The command you wrote looks good to me, do you get the same error with every apk file? Can you share an apk file that returns this error?

[bluecatpixel]

Hi. Thanks for your quick response.

After all it's not about the apk or signature because I tried with several apks, I even created one simple debug apk just for test and still always the same. I'm running the docker in a macbook M1 I guess it must be related. Now I'm trying to do it on a windows machine (old) but I'm getting problems with the docker. I'll let you know the results.

[bluecatpixel]

Hi.

As I suspected the problem was related with my macbook M1. I wasn't able to fixed it so I prepared an old computer with ubuntu and this time it was ok.

Now although it works without errors the results are not the expected.

I tried to rename the classes, methods and fields and when I analyse the apk or I do the reverse engineer I still see the classes, methods and fields names.

What I'm doing wrong? Thanks in advance.

This is the execution: joserfsantos@joserfsantos-HP-ProBook-640-G1:~/Downloads$ sudo docker run --rm -it -u $(id -u):$(id -g) -v "${PWD}":"/workdir" obfuscapk -o RandomManifest -o Rebuild -o NewAlignment -o NewSignature -o ClassRename -o FieldRename -o Goto -o LibEncryption -o MethodRename ./app.apk -p --keystore-file XXXX --keystore-password XXXX --key-alias XXXX --key-password XXXX Class name to smali file mapping: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████|[00:00<00:00, 30206.73file/s] Renaming class declarations: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:04<00:00, 3659.20file/s] Renaming class usages in smali files: 100%|████████████████████████████████████████████████████████████████████████████████████████████████|[00:11<00:00, 1337.80file/s] Renaming class usages in xml files: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████|[00:03<00:00, 40.49file/s] Renaming field declarations: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:00<00:00, 1431.74file/s] Renaming field declarations: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:04<00:00, 1992.11file/s] Renaming field declarations: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:02<00:00, 2110.29file/s] Processing multidex: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:07<00:00, 2.46s/dex] Renaming field references: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:06<00:00, 2159.88file/s] Inserting "goto" instructions in smali files: 100%|████████████████████████████████████████████████████████████████████████████████████████|[00:06<00:00, 2297.38file/s] Renaming method declarations: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:06<00:00, 2454.56file/s] Renaming method invocations: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████|[00:08<00:00, 1748.93file/s] Running obfuscators (MethodRename): 100%|██████████████████████████████████████████████████████████████████████████████████████████████|[01:52<00:00, 12.46s/obfuscator]

[ClaudiuGeorgiu]

What I'm doing wrong?

You are using some obfuscators after rebuilding the app, see FAQ. Put -o Rebuild -o NewAlignment -o NewSignature after all the other obfuscators.

[bluecatpixel]

LOL...makes sense

thanks for the quick response