# Intercepting Android App Traffic *** ## 🌐 Resources 🔗 > * [Genymotion](https://www.genymotion.com/download/) > * [Frida](https://frida.re/) > * [OWASP SSL Certificate and Public Key Pinning](https://owasp.org/www-community/controls/Certificate_and_Public_Key_Pinning) > * Extra video - [Getting Started with Android App Testing with Genymotion - InsiderPhD](https://www.youtube.com/watch?v=_HRpLPrlg1U) *** ## Bypass certificate pinning with Frida I've used my KaliVM and this instructions to follow IppSec's video and get everything working as he described. > 🔗 [Intercepting Android App Traffic with BurpSuite](https://www.youtube.com/watch?v=xp8ufidc514) - by [IppSec](https://ippsec.rocks/) > > **Video Timeline** > > ``` > 00:00 - Introduction, talking about RouterSpace and why we can't just do what we did in that video > 01:25 - Installing Genymotion, Virtual Box, and ADB; while talking about why I don't use Android Studio/AVD. Simply because genymotion just works. > 02:05 - Make sure you upgrade your memory, processors, and enable Virtualization in your VM Settings! > 02:30 - Running Genymotion and starting a Pixel 3 XL > 03:37 - Converting BurpSuites Certificate to PEM Format with openssl x509 -inform der -in [name of cert] -out burp.pem > 04:20 - Renaming the certificate to 9a5ba575.0, and showing how we got that name > 06:00 - Starting the device and showing the certificate authorities > 07:00 - Copying the certificate to /system/etc/security/cacerts/, and showing how to remount to rw > 08:10 - Showing how to set the proxy through both the GUI and via ADB > 09:50 - Installing GAPPS > 10:30 - Showing how to unset the proxy from ADB > 11:00 - Creating an alias to set and unset the proxy via adb > 12:00 - Opening the google play store and logging in and install Wayzn to see if we can intercept traffic > 15:20 - Showing we intercepted traffic from Wayzn, then installing Instagram > 16:50 - Attempting to login to instagram and getting an error message > 17:20 - Setting up Frida both on our computer and android device > 19:20 - Showing Frida is working, getting ps output from the android device > 19:55 - Downloading the instragram ssl pinning bypass script > 21:20 - Using frida to start instagram and loading the script to bypass the SSL Checking > 22:15 - Setting the proxy and showing us intercept instagram traffic > ``` ```bash sudo apt install -y virtualbox adb sudo wget https://dl.genymotion.com/releases/genymotion-3.5.1/genymotion-3.5.1-linux_x64.bin -O /tmp/genymotion.bin sudo chmod +x genymotion.bin sudo ./genymotion.bin cd /opt/genymobile/genymotion ./genymotion ``` * Open Genymotion Settings and setup Hypervisor to **Virtualbox** * Install a new Google Pixel 3 XL device * Run Burpsuite and copy its certificate ```bash cd curl localhost:8080/cert -o cert.der sudo mv cert.der /usr/share/ca-certificates/BurpSuiteCA.der openssl x509 -inform der -in /usr/share/ca-certificates/BurpSuiteCA.der -out burp.pem openssl x509 -inform PEM -subject_hash_old -in burp.pem mv burp.pem 9a5ba575.0 # Output from above ``` * Copy cert to device ```bash adb devices -l adb shell su mount -o remount,rw / exit exit adb push 9a5ba575.0 /system/etc/security/cacerts/ ``` ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-8549200246da8bd2d7d5f791d73baf59aa029cd3%2F2023-07-02_17-21-49_134.png?alt=media) * To start capturing traffic with BurpSuite, set the proxy listener to `All interfaces` ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-e72912c75459da6b90f5d39e422efa284fd07e50%2F2023-07-02_17-25-13_135.png?alt=media) * Set the proxy usage on the device, with the KaliVM IP ```bash adb shell settings put global http_proxy 192.168.31.128:8080 # Create an alias for set and unset proxy alias adb_set_proxy="adb shell settings put global http_proxy $(ip -o -4 addr show eth1 | awk '{print $4}' | sed 's/\/.*//g'):8080" alias adb_unset_proxy="adb shell settings put global http_proxy :0" ``` * From Genymotion, click OpenGAPPS to install Gapps on the device and restart the device. ```bash # Disable proxy adb_unset_proxy ``` * Run Play Store on the device and install apps * `e.g.` - Wayzn, Instagram - in this case * Try to set the proxy, turn BurpSuite intercept on and login into the *Wayzn* app ``` adb_set_proxy ``` ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-e60ad811ff419201d73a408f1ae2f9726c65c171%2F2023-07-02_17-46-30_136.png?alt=media) * Open Instagram and try to login. `Unable to log in` with proxy set. ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-d7e265236e7a8fa9421d9310c675e6db8e020d43%2F2023-07-02_17-49-59_137.png?alt=media) * Unsetting the proxy, Instagram error changes. * Instagram prevents from intercepting the traffic ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-edb05210ad778b7cb436ba9049395c41d877561d%2F2023-07-02_17-50-46_138.png?alt=media) * Install Frida * 🔗 Follow [Frida Android](https://frida.re/docs/android/) ```bash # On KaliVM pipx install frida-tools # On device adb shell uname -a Linux localhost 5.10.101-genymotion+-ab74 #1 SMP PREEMPT Thu Dec 1 14:03:02 UTC 2022 x86_64 # x86_64 - Download frida-server-16.1.1-android-x86_64.xz exit wget https://github.com/frida/frida/releases/download/16.1.1/frida-server-16.1.1-android-x86_64.xz 7z x frida-server-16.1.1-android-x86_64.xz mv frida-server-16.1.1-android-x86_64 frida-server adb push frida-server /data/local/tmp/ adb shell "chmod 755 /data/local/tmp/frida-server" adb shell "/data/local/tmp/frida-server &" ``` * Check **Frida** is working ```bash frida-ps -U # This is device output PID Name ---- ------------------------------------------------------------- 5446 Google Play Store 6085 Instagram 1960 Phone 5249 Wayzn 473 adbd 1268 android.ext.services [...] ``` * Download the [Instagram SSL Pinning Bypass](https://github.com/Eltion/Instagram-SSL-Pinning-Bypass) script 22:15 - Setting the proxy and showing us intercept instagram traffic ``` sudo mkdir -p /opt/android/instagram cd /opt/android/instagram sudo wget https://raw.githubusercontent.com/Eltion/Instagram-SSL-Pinning-Bypass/main/instagram-ssl-pinning-bypass.js ``` * Force stop Instagram app from App info * Use Frida to start Instagram and load the script to bypass the SSL Checking ```bash adb_set_proxy frida -U -l ./instagram-ssl-pinning-bypass.js -f com.instagram.android ``` ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-d8d17a20bb0975fc3b7a671c60a84ee8b8cffac4%2F2023-07-02_18-07-35_139.png?alt=media) * Show Instagram intercepted traffic in BurpSuite ![](https://1099202751-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FEhofjMfYbx3gOUSReXD7%2Fuploads%2Fgit-blob-a393abc700ba4827e433371a406ee64849749c96%2F2023-07-02_18-09-42_140.png?alt=media) ***