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**From**: [https://joshspicer.com/android-frida-1](https://joshspicer.com/android-frida-1)\ **APK**: [https://github.com/OWASP/owasp-mstg/blob/master/Crackmes/Android/Level\_01/UnCrackable-Level1.apk](https://github.com/OWASP/owasp-mstg/blob/master/Crackmes/Android/Level\_01/UnCrackable-Level1.apk) # Solution 1 Based in [https://joshspicer.com/android-frida-1](https://joshspicer.com/android-frida-1) **Hook the **_**exit()**_ function and **decrypt function** so it print the flag in frida console when you press verify: ```javascript Java.perform(function () { send("Starting hooks OWASP uncrackable1..."); function getString(data){ var ret = ""; for (var i=0; i < data.length; i++){ ret += "#" + data[i].toString(); } return ret } var aes_decrypt = Java.use("sg.vantagepoint.a.a"); aes_decrypt.a.overload("[B","[B").implementation = function(var_0,var_1) { send("sg.vantagepoint.a.a.a([B[B)[B doFinal(enc) // AES/ECB/PKCS7Padding"); send("Key : " + getString(var_0)); send("Encrypted : " + getString(var_1)); var ret = this.a.overload("[B","[B").call(this,var_0,var_1); send("Decrypted : " + getString(ret)); var flag = ""; for (var i=0; i < ret.length; i++){ flag += String.fromCharCode(ret[i]); } send("Decrypted flag: " + flag); return ret; //[B }; var sysexit = Java.use("java.lang.System"); sysexit.exit.overload("int").implementation = function(var_0) { send("java.lang.System.exit(I)V // We avoid exiting the application :)"); }; send("Hooks installed."); }); ``` # Solution 2 Based in [https://joshspicer.com/android-frida-1](https://joshspicer.com/android-frida-1) **Hook rootchecks** and decrypt function so it print the flag in frida console when you press verify: ```javascript Java.perform(function () { send("Starting hooks OWASP uncrackable1..."); function getString(data){ var ret = ""; for (var i=0; i < data.length; i++){ ret += "#" + data[i].toString(); } return ret } var aes_decrypt = Java.use("sg.vantagepoint.a.a"); aes_decrypt.a.overload("[B","[B").implementation = function(var_0,var_1) { send("sg.vantagepoint.a.a.a([B[B)[B doFinal(enc) // AES/ECB/PKCS7Padding"); send("Key : " + getString(var_0)); send("Encrypted : " + getString(var_1)); var ret = this.a.overload("[B","[B").call(this,var_0,var_1); send("Decrypted : " + getString(ret)); var flag = ""; for (var i=0; i < ret.length; i++){ flag += String.fromCharCode(ret[i]); } send("Decrypted flag: " + flag); return ret; //[B }; var rootcheck1 = Java.use("sg.vantagepoint.a.c"); rootcheck1.a.overload().implementation = function() { send("sg.vantagepoint.a.c.a()Z Root check 1 HIT! su.exists()"); return false; }; var rootcheck2 = Java.use("sg.vantagepoint.a.c"); rootcheck2.b.overload().implementation = function() { send("sg.vantagepoint.a.c.b()Z Root check 2 HIT! test-keys"); return false; }; var rootcheck3 = Java.use("sg.vantagepoint.a.c"); rootcheck3.c.overload().implementation = function() { send("sg.vantagepoint.a.c.c()Z Root check 3 HIT! Root packages"); return false; }; var debugcheck = Java.use("sg.vantagepoint.a.b"); debugcheck.a.overload("android.content.Context").implementation = function(var_0) { send("sg.vantagepoint.a.b.a(Landroid/content/Context;)Z Debug check HIT! "); return false; }; send("Hooks installed."); }); ```
Support HackTricks and get benefits! Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** **Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**