Android Applications Pentesting
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It's highly recommended to start reading this page to know about the most important parts related to Android security and the most dangerous components in an Android application:
This is the main tool you need to connect to an android device (emulated or physical). ADB allows to control devices either over USB or Network from a computer. This utility enables the copying of files in both directions, installation and uninstallation of apps, execution of shell commands, backing up of data, reading of logs, among other functions.
Extract APK from device:
Firebase
The examination of an application's _Manifest.xml** and **strings.xml_** files can reveal potential security vulnerabilities**. These files can be accessed using decompilers or by renaming the APK file extension to .zip and then unzipping it.
Vulnerabilities identified from the Manifest.xml include:
Debuggable Applications: Applications set as debuggable (debuggable="true") in the Manifest.xml file pose a risk as they allow connections that can lead to exploitation. For further understanding on how to exploit debuggable applications, refer to a tutorial on finding and exploiting debuggable applications on a device.
Backup Settings: The android:allowBackup="false" attribute should be explicitly set for applications dealing with sensitive information to prevent unauthorized data backups via adb, especially when usb debugging is enabled.
Network Security: Custom network security configurations (android:networkSecurityConfig="@xml/network_security_config") in res/xml/ can specify security details like certificate pins and HTTP traffic settings. An example is allowing HTTP traffic for specific domains.
Exported Activities and Services: Identifying exported activities and services in the manifest can highlight components that might be misused. Further analysis during dynamic testing can reveal how to exploit these components.
Content Providers and FileProviders: Exposed content providers could allow unauthorized access or modification of data. The configuration of FileProviders should also be scrutinized.
Broadcast Receivers and URL Schemes: These components could be leveraged for exploitation, with particular attention to how URL schemes are managed for input vulnerabilities.
SDK Versions: The minSdkVersion, targetSDKVersion, and maxSdkVersion attributes indicate the supported Android versions, highlighting the importance of not supporting outdated, vulnerable Android versions for security reasons.
From the strings.xml file, sensitive information such as API keys, custom schemas, and other developer notes can be discovered, underscoring the need for careful review of these resources.
Tapjacking is an attack where a malicious application is launched and positions itself on top of a victim application. Once it visibly obscures the victim app, its user interface is designed in such a way as to trick the user to interact with it, while it is passing the interaction along to the victim app. In effect, it is blinding the user from knowing they are actually performing actions on the victim app.
Find more information in:
An activity with the launchMode set to singleTask without any taskAffinity defined is vulnerable to task Hijacking. This means, that an application can be installed and if launched before the real application it could hijack the task of the real application (so the user will be interacting with the malicious application thinking he is using the real one).
More info in:
Internal Storage
In Android, files stored in internal storage are designed to be accessible exclusively by the app that created them. This security measure is enforced by the Android operating system and is generally adequate for the security needs of most applications. However, developers sometimes utilize modes such as MODE_WORLD_READABLE and MODE_WORLD_WRITABLE to allow files to be shared between different applications. Yet, these modes do not restrict access to these files by other applications, including potentially malicious ones.
Static Analysis:
Ensure that the use of MODE_WORLD_READABLE and MODE_WORLD_WRITABLE is carefully scrutinized. These modes can potentially expose files to unintended or unauthorized access.
Dynamic Analysis:
Verify the permissions set on files created by the app. Specifically, check if any files are set to be readable or writable worldwide. This can pose a significant security risk, as it would allow any application installed on the device, regardless of its origin or intent, to read or modify these files.
External Storage
When dealing with files on external storage, such as SD Cards, certain precautions should be taken:
Accessibility:
Files on external storage are globally readable and writable. This means any application or user can access these files.
Security Concerns:
Given the ease of access, it's advised not to store sensitive information on external storage.
External storage can be removed or accessed by any application, making it less secure.
Handling Data from External Storage:
Always perform input validation on data retrieved from external storage. This is crucial because the data is from an untrusted source.
Storing executables or class files on external storage for dynamic loading is strongly discouraged.
If your application must retrieve executable files from external storage, ensure these files are signed and cryptographically verified before they are dynamically loaded. This step is vital for maintaining the security integrity of your application.
External storage can be accessed in /storage/emulated/0 , /sdcard , /mnt/sdcard
Sensitive data stored in clear-text
Shared preferences: Android allow to each application to easily save xml files in the path /data/data/<packagename>/shared_prefs/ and sometimes it's possible to find sensitive information in clear-text in that folder.
Databases: Android allow to each application to easily save sqlite databases in the path /data/data/<packagename>/databases/ and sometimes it's possible to find sensitive information in clear-text in that folder.
Accept All Certificates
For some reason sometimes developers accept all the certificates even if for example the hostname does not match with lines of code like the following one:
A good way to test this is to try to capture the traffic using some proxy like Burp without authorising Burp CA inside the device. Also, you can generate with Burp a certificate for a different hostname and use it.
Poor Key Management Processes
Some developers save sensitive data in the local storage and encrypt it with a key hardcoded/predictable in the code. This shouldn't be done as some reversing could allow attackers to extract the confidential information.
Use of Insecure and/or Deprecated Algorithms
Developers shouldn't use deprecated algorithms to perform authorisation checks, store or send data. Some of these algorithms are: RC4, MD4, MD5, SHA1... If hashes are used to store passwords for example, hashes brute-force resistant should be used with salt.
It's recommended to obfuscate the APK to difficult the reverse engineer labour to attackers.
If the app is sensitive (like bank apps), it should perform it's own checks to see if the mobile is rooted and act in consequence.
If the app is sensitive (like bank apps), it should check if an emulator is being used.
If the app is sensitive (like bank apps), it should check it's own integrity before executing it to check if it was modified.
Read the following page to learn how to easily access javascript code of React applications:
Read the following page to learn how to easily access C# code of a xamarin applications:
With this knowledge, mariana-trench will review the code and find possible vulnerabilities on it.
Code execution: Runtime.exec(), ProcessBuilder(), native code:system()
Send SMSs: sendTextMessage, sendMultipartTestMessage
Native functions declared as native: public native, System.loadLibrary, System.load
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First of all, you need an environment where you can install the application and all the environment (Burp CA cert, Drozer and Frida mainly). Therefore, a rooted device (emulated or not) is extremely recommended.
You can even see the logs of your application in the web and connect through adb.
Thanks to the ADB connection you can use Drozer and Frida inside the emulators.
Learn to set it up in this page:
To install google services (like AppStore) in Genymotion you need to click on the red marked button of the following image:
Also, notice that in the configuration of the Android VM in Genymotion you can select Bridge Network mode (this will be useful if you will be connecting to the Android VM from a different VM with the tools).
You need to activate the debugging options and it will be cool if you can root it:
Settings.
(FromAndroid 8.0) Select System.
Select About phone.
Press Build number 7 times.
Go back and you will find the Developer options.
Once you have installed the application, the first thing you should do is to try it and investigate what does it do, how does it work and get comfortable with it. I will suggest to perform this initial dynamic analysis using MobSF dynamic analysis + pidcat, so we will be able to learn how the application works while MobSF captures a lot of interesting data you can review later on.
Logging
Note that from later newer than Android 4.0, applications are only able to access their own logs. So applications cannot access other apps logs. Anyway, it's still recommended to not log sensitive information.
Copy/Paste Buffer Caching
Android's clipboard-based framework enables copy-paste functionality in apps, yet poses a risk as other applications can access the clipboard, potentially exposing sensitive data. It's crucial to disable copy/paste functions for sensitive sections of an application, like credit card details, to prevent data leaks.
Crash Logs
If an application crashes and saves logs, these logs can assist attackers, particularly when the application cannot be reverse-engineered. To mitigate this risk, avoid logging on crashes, and if logs must be transmitted over the network, ensure they are sent via an SSL channel for security.
As pentester, try to take a look to these logs.
Analytics Data Sent To 3rd Parties
Applications often integrate services like Google Adsense, which can inadvertently leak sensitive data due to improper implementation by developers. To identify potential data leaks, it's advisable to intercept the application's traffic and check for any sensitive information being sent to third-party services.
Most of the applications will use internal SQLite databases to save information. During the pentest take a look to the databases created, the names of tables and columns and all the data saved because you could find sensitive information (which would be a vulnerability).
Databases should be located in /data/data/the.package.name/databases like /data/data/com.mwr.example.sieve/databases
If the database is saving confidential information and is encrypted but you can find the password inside the application it's still a vulnerability.
Enumerate the tables using .tables and enumerate the columns of the tables doing .schema <table_name>
Authorisation bypass
When an Activity is exported you can invoke its screen from an external app. Therefore, if an activity with sensitive information is exported you could bypass the authentication mechanisms to access it.
You can also start an exported activity from adb:
PackageName is com.example.demo
Exported ActivityName is com.example.test.MainActivity
Sensitive information leakage
Activities can also return results. If you manage to find an exported and unprotected activity calling the setResult method and returning sensitive information, there is a sensitive information leakage.
Note that you can omit the package name and the mobile will automatically call the app that should open that link.
Code executed
In order to find the code that will be executed in the App, go to the activity called by the deeplink and search the function onNewIntent.
Sensitive info
Every time you find a deep link check that it's not receiving sensitive data (like passwords) via URL parameters, because any other application could impersonate the deep link and steal that data!
Parameters in path
More examples
Certificates are not always inspected properly by Android applications. It's common for these applications to overlook warnings and accept self-signed certificates or, in some instances, revert to using HTTP connections.
Negotiations during the SSL/TLS handshake are sometimes weak, employing insecure cipher suites. This vulnerability makes the connection susceptible to man-in-the-middle (MITM) attacks, allowing attackers to decrypt the data.
Leakage of private information is a risk when applications authenticate using secure channels but then communicate over non-secure channels for other transactions. This approach fails to protect sensitive data, such as session cookies or user details, from interception by malicious entities.
SSL Pinning is a security measure where the application verifies the server's certificate against a known copy stored within the application itself. This method is essential for preventing MITM attacks. Implementing SSL Pinning is strongly recommended for applications handling sensitive information.
When SSL Pinning is implemented, bypassing it becomes necessary to inspect HTTPS traffic. Various methods are available for this purpose:
You can also try to automatically bypass SSL Pinning using MobSF dynamic analysis (explained below)
It's important to also search for common web vulnerabilities within the application. Detailed information on identifying and mitigating these vulnerabilities is beyond the scope of this summary but is extensively covered elsewhere.
Check if the application is storing sensitive information inside the memory that it shouldn't be storing like passwords or mnemonics.
This will dump the memory in ./dump folder, and in there you could grep with something like:
In Android the Keystore is the best place to store sensitive data, however, with enough privileges it's still possible to access it. As applications tends to store here sensitive data in clear text the pentests should check for it as root user or someones with physical access to the device could be able to steal this data.
Even if an app stored date in the keystore, the data should be encrypted.
Using the following Frida script it could be possible to bypass fingerprint authentication Android applications might be performing in order to protect certain sensitive areas:
When you put an application in background, Android stores a snapshot of the application so when it's recovered to foreground it starts loading the image before the app so ot looks like the app was loaded faster.
However, if this snapshot contains sensitive information, someone with access to the snapshot might steal that info (note that you need root to access it).
The snapshots are usually stored around: /data/system_ce/0/snapshots
Android provides a way to prevent the screenshot capture by setting the FLAG_SECURE layout parameter. By using this flag, the window contents are treated as secure, preventing it from appearing in screenshots or from being viewed on non-secure displays.
Developers often create proxy components like activities, services, and broadcast receivers that handle these Intents and pass them to methods such as startActivity(...) or sendBroadcast(...), which can be risky.
The danger lies in allowing attackers to trigger non-exported app components or access sensitive content providers by misdirecting these Intents. A notable example is the WebView component converting URLs to Intent objects via Intent.parseUri(...) and then executing them, potentially leading to malicious Intent injections.
Intent Injection is similar to web's Open Redirect issue.
Exploits involve passing Intent objects as extras, which can be redirected to execute unsafe operations.
It can expose non-exported components and content providers to attackers.
WebView’s URL to Intent conversion can facilitate unintended actions.
Probably you know about this kind of vulnerabilities from the Web. You have to be specially careful with this vulnerabilities in an Android application:
SQL Injection: When dealing with dynamic queries or Content-Providers ensure you are using parameterized queries.
Eternal cookies: In several cases when the android application finish the session the cookie isn't revoked or it could be even saved to disk
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Static analysis
Vulnerability assessment of the application using a nice web-based frontend. You can also perform dynamic analysis (but you need to prepare the environment).
Notice that MobSF can analyse Android(apk), IOS(ipa) and Windows(apx) applications (Windows applications must be analyzed from a MobSF installed in a Windows host). Also, if you create a ZIP file with the source code if an Android or an IOS app (go to the root folder of the application, select everything and create a ZIPfile), it will be able to analyse it also.
MobSF also allows you to diff/Compare analysis and to integrate VirusTotal (you will need to set your API key in MobSF/settings.py and enable it: VT_ENABLED = TRUE VT_API_KEY = <Your API key> VT_UPLOAD = TRUE). You can also set VT_UPLOAD to False, then the hash will be upload instead of the file.
MobSF can also be very helpful for dynamic analysis in Android, but in that case you will need to install MobSF and genymotion in your host (a VM or Docker won't work). Note: You need to start first a VM in genymotion and then MobSF. The MobSF dynamic analyser can:
Dump application data (URLs, logs, clipboard, screenshots made by you, screenshots made by "Exported Activity Tester", emails, SQLite databases, XML files, and other created files). All of this is done automatically except for the screenshots, you need to press when you want a screenshot or you need to press "Exported Activity Tester" to obtain screenshots of all the exported activities.
Capture HTTPS traffic
Use Frida to obtain runtime information
From android versions > 5, it will automatically start Frida and will set global proxy settings to capture traffic. It will only capture traffic from the tested application.
Frida
By default, it will also use some Frida Scripts to bypass SSL pinning, root detection and debugger detection and to monitor interesting APIs. MobSF can also invoke exported activities, grab screenshots of them and save them for the report.
To start the dynamic testing press the green bottom: "Start Instrumentation". Press the "Frida Live Logs" to see the logs generated by the Frida scripts and "Live API Monitor" to see all the invocation to hooked methods, arguments passed and returned values (this will appear after pressing "Start Instrumentation").
MobSF also allows you to load your own Frida scripts (to send the results of your Friday scripts to MobSF use the function send()). It also has several pre-written scripts you can load (you can add more in MobSF/DynamicAnalyzer/tools/frida_scripts/others/), just select them, press "Load" and press "Start Instrumentation" (you will be able to see the logs of that scripts inside "Frida Live Logs").
Moreover, you have some Auxiliary Frida functionalities:
Enumerate Loaded Classes: It will print all the loaded classes
Capture Strings: It will print all the capture strings while using the application (super noisy)
Capture String Comparisons: Could be very useful. It will show the 2 strings being compared and if the result was True or False.
Enumerate Class Methods: Put the class name (like "java.io.File") and it will print all the methods of the class.
Search Class Pattern: Search classes by pattern
Trace Class Methods: Trace a whole class (see inputs and outputs of all methods of th class). Remember that by default MobSF traces several interesting Android Api methods.
Once you have selected the auxiliary module you want to use you need to press "Start Intrumentation" and you will see all the outputs in "Frida Live Logs".
Shell
Mobsf also brings you a shell with some adb commands, MobSF commands, and common shell commands at the bottom of the dynamic analysis page. Some interesting commands:
HTTP tools
Once you finish the dynamic analysis with MobSF you can press on "Start Web API Fuzzer" to fuzz http requests an look for vulnerabilities.
This is a great tool to perform static analysis with a GUI
This tool is designed to look for several security related Android application vulnerabilities, either in source code or packaged APKs. The tool is also capable of creating a "Proof-of-Concept" deployable APK and ADB commands, to exploit some of the found vulnerabilities (Exposed activities, intents, tapjacking...). As with Drozer, there is no need to root the test device.
Displays all extracted files for easy reference
Automatically decompile APK files to Java and Smali format
Analyze AndroidManifest.xml for common vulnerabilities and behavior
Static source code analysis for common vulnerabilities and behavior
Device info
and more
SUPER is a command-line application that can be used in Windows, MacOS X and Linux, that analyzes .apk files in search for vulnerabilities. It does this by decompressing APKs and applying a series of rules to detect those vulnerabilities.
All rules are centered in a rules.json file, and each company or tester could create its own rules to analyze what they need.
The concept is that you drag and drop your mobile application file (an .apk or .ipa file) on the StaCoAn application and it will generate a visual and portable report for you. You can tweak the settings and wordlists to get a customized experience.
Androwarn is a tool whose main aim is to detect and warn the user about potential malicious behaviours developped by an Android application.
This tool looks for common behavior of "bad" applications like: Telephony identifiers exfiltration, Audio/video flow interception, PIM data modification, Arbitrary code execution...
MARA is a Mobile Application Reverse engineering and Analysis Framework. It is a tool that puts together commonly used mobile application reverse engineering and analysis tools, to assist in testing mobile applications against the OWASP mobile security threats. Its objective is to make this task easier and friendlier to mobile application developers and security professionals.
It is able to:
Extract Java and Smali code using different tools
Extract private information from the APK using regexps.
Analyze the Manifest.
Note that depending the service and configuration you use to obfuscate the code. Secrets may or may not ended obfuscated.
ProGuard is distributed as part of the Android SDK and runs when building the application in release mode.
(From that guide) Last time we checked, the Dexguard mode of operation was:
load a resource as an InputStream;
feed the result to a class inheriting from FilterInputStream to decrypt it;
do some useless obfuscation to waste a few minutes of time from a reverser;
feed the decrypted result to a ZipInputStream to get a DEX file;
finally load the resulting DEX as a Resource using the loadDex method.
DeGuard reverses the process of obfuscation performed by Android obfuscation tools. This enables numerous security analyses, including code inspection and predicting libraries.
You can upload an obfuscated APK to their platform.
It is a generic android deobfuscator. Simplify virtually executes an app to understand its behavior and then tries to optimize the code so it behaves identically but is easier for a human to understand. Each optimization type is simple and generic, so it doesn't matter what the specific type of obfuscation is used.
AndroL4b is an Android security virtual machine based on ubuntu-mate includes the collection of latest framework, tutorials and labs from different security geeks and researchers for reverse engineering and malware analysis.
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Take a look to the following list of to learn how to use adb.
Sometimes it is interesting to modify the application code to access hidden information (maybe well obfuscated passwords or flags). Then, it could be interesting to decompile the apk, modify the code and recompile it. . This could be very useful as an alternative for several tests during the dynamic analysis that are going to presented. Then, keep always in mid this possibility.
Download APKs: , , , ,
Merge all splits and base apks with :
First of all, for analysing an APK you should take a look to the to the Java code using a decompiler. Please, .
Just taking a look to the strings of the APK you can search for passwords, URLs (), api keys, encryption, bluetooth uuids, tokens and anything interesting... look even for code execution backdoors or authentication backdoors (hardcoded admin credentials to the app).
Pay special attention to firebase URLs and check if it is bad configured.
Use to check which compiler/packer/obfuscator was used to build the APK
According to this superpacked is a Meta algorithm that compress the content of an application into a single file. The blog talks about the possibility of creating an app that decompress these kind of apps... and a faster way which involves to execute the application and gather the decompressed files from the filesystem.
The tool is capable of finding vulnerabilities by scanning the code of the application. This tool contains a series of known sources (that indicates to the tool the places where the input is controlled by the user), sinks (which indicates to the tool dangerous places where malicious user input could cause damages) and rules. These rules indicates the combination of sources-sinks that indicates a vulnerability.
An application may contain secrets (API keys, passwords, hidden urls, subdomains...) inside of it that you might be able to discover. You could us a tool such as
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You can create a free account in: . This platform allows you to upload and execute APKs, so it is useful to see how an apk is behaving.
(You can create x86 and arm devices, and according to latest x86 versions support ARM libraries without needing an slow arm emulator).
(Free version: Personal Edition, you need to create an account. It's recommend to download the version WITH VirtualBox to avoid potential errors.)
(Free, but it doesn't support Frida or Drozer).
Developers should be cautious of exposing debugging information publicly, as it can lead to sensitive data leaks. The tools and adb logcat are recommended for monitoring application logs to identify and protect sensitive information. Pidcat is favored for its ease of use and readability.
From : Drozer allows you to assume the role of an Android app and interact with other apps. It can do anything that an installed application can do, such as make use of Android’s Inter-Process Communication (IPC) mechanism and interact with the underlying operating system. . Drozer is s useful tool to exploit exported activities, exported services and Content Providers as you will learn in the following sections.
Also remember that the code of an activity starts in the onCreate method.
NOTE: MobSF will detect as malicious the use of singleTask/singleInstance as android:launchMode in an activity, but due to , apparently this is only dangerous on old versions (API versions < 21).
If tapjacking isn't prevented, you could abuse the exported activity to make the user perform unexpected actions. For more info about .
Content providers are basically used to share data. If an app has available content providers you may be able to extract sensitive data from them. It also interesting to test possible SQL injections and Path Traversals as they could be vulnerable.
Remember that a the actions of a Service start in the method onStartCommand.
As service is basically something that can receive data, process it and returns (or not) a response. Then, if an application is exporting some services you should check the code to understand what is it doing and test it dynamically for extracting confidential info, bypassing authentication measures...
Remember that a the actions of a Broadcast Receiver start in the method onReceive.
A broadcast receiver will be waiting for a type of message. Depending on ho the receiver handles the message it could be vulnerable.
You can look for deep links manually, using tools like MobSF or scripts like . You can open a declared scheme using adb or a browser:
You must check also if any deep link is using a parameter inside the path of the URL like: https://api.example.com/v1/users/{username} , in that case you can force a path traversal accessing something like: example://app/users?username=../../unwanted-endpoint%3fparam=value .
Note that if you find the correct endpoints inside the application you may be able to cause a Open Redirect (if part of the path is used as domain name), account takeover (if you can modify users details without CSRF token and the vuln endpoint used the correct method) and any other vuln. More .
An about links (/.well-known/assetlinks.json).
We will focus on certificate verification. The integrity of the server's certificate must be verified to enhance security. This is crucial because insecure TLS configurations and the transmission of sensitive data over unencrypted channels can pose significant risks. For detailed steps on verifying server certificates and addressing vulnerabilities, provides comprehensive guidance.
To inspect HTTP traffic, it's necessary to install the proxy tool's certificate (e.g., Burp). Without installing this certificate, encrypted traffic might not be visible through the proxy. For a guide on installing a custom CA certificate, .
Applications targeting API Level 24 and above require modifications to the Network Security Config to accept the proxy's CA certificate. This step is critical for inspecting encrypted traffic. For instructions on modifying the Network Security Config, .
Automatically modify the apk to bypass SSLPinning with . The best pro of this option, is that you won't need root to bypass the SSL Pinning, but you will need to delete the application and reinstall the new one, and this won't always work.
You could use Frida (discussed below) to bypass this protection. Here you have a guide to use Burp+Frida+Genymotion:
You can also try to automatically bypass SSL Pinning using : objection --gadget com.package.app explore --startup-command "android sslpinning disable"
If you still think that there is some traffic that you aren't capturing you can try to forward the traffic to burp using iptables. Read this blog:
is a dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers. You can access running application and hook methods on run time to change the behaviour, change values, extract values, run different code... If you want to pentest Android applications you need to know how to use Frida.
Learn how to use Frida:
Some "GUI" for actions with Frida:
Ojection is great to automate the use of Frida: ,
You can find some Awesome Frida scripts here:
Try to bypass anti-debugging / anti-frida mechanisms loading Frida as in indicated in (tool )
Using you can dump the memory of the app with:
To access the data inside the keystore you could use this Frida script:
This tool could help you managing different tools during the dynamic analysis:
JavaScript Injection (XSS): Verify that JavaScript and Plugin support is disabled for any WebViews (disabled by default). .
Local File Inclusion: WebViews should have access to the file system disabled (enabled by default) - (webview.getSettings().setAllowFileAccess(false);). .
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When http traffic is capture you can see an ugly view of the captured traffic on "HTTP(S) Traffic" bottom or a nicer view in "Start HTTPTools" green bottom. From the second option, you can send the captured requests to proxies like Burp or Owasp ZAP. To do so, power on Burp --> turn off Intercept --> in MobSB HTTPTools select the request --> press "Send to Fuzzer" --> select the proxy address ().
You can get the tool from . This tool with use some Hooks to let you know what is happening in the application while you perform a dynamic analysis.
Download the latest binaries from in the
StaCoAn is a crossplatform tool which aids developers, bugbounty hunters and ethical hackers performing on mobile applications.
Download:
AndroBugs Framework is an Android vulnerability analysis system that helps developers or hackers find potential security vulnerabilities in Android applications.
The detection is performed with the static analysis of the application's Dalvik bytecode, represented as Smali, with the library.
Analyze APKs using: , , , ,
Analyze found domains using: , and
Deobfuscate APK via
Useful to detect malware:
From : ProGuard is an open source command-line tool that shrinks, optimizes and obfuscates Java code. It is able to optimize bytecode as well as detect and remove unused instructions. ProGuard is free software and is distributed under the GNU General Public License, version 2.
Find a step-by-step guide to deobfuscate the apk in
APKiD gives you information about how an APK was made. It identifies many compilers, packers, obfuscators, and other weird stuff. It's for Android.
It is a great list of resources
Android quick course
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