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Instalacija

Instalirajte frida tools:

pip install frida-tools
pip install frida

Preuzmite i instalirajte na Android uređaj frida server (Download the latest release).
Jednolinijska komanda za restartovanje adb u root režimu, povezivanje sa njim, otpremanje frida-server, dodeljivanje exec dozvola i pokretanje u pozadini:

adb root; adb connect localhost:6000; sleep 1; adb push frida-server /data/local/tmp/; adb shell "chmod 755 /data/local/tmp/frida-server"; adb shell "/data/local/tmp/frida-server &"

Proveri da li radi:

frida-ps -U #List packages and processes
frida-ps -U | grep -i <part_of_the_package_name> #Get all the package name

frida-ui (Frida kontroler baziran na browseru)

frida-ui pruža web UI na http://127.0.0.1:8000 za prikaz uređaja/aplikacija i za attach ili spawn targeta sa skriptama (nije potrebna CLI).

• Instalirajte (pin frida na verziju device servera):

uv tool install frida-ui --with frida==16.7.19
# pipx install frida-ui
# pip install frida-ui

• Pokreni:

frida-ui
frida-ui --host 127.0.0.1 --port 8000 --reload

• Funkcije: otkriva USB/lokalne uređaje, dodaje udaljene servere (192.168.1.x:27042) i podržava Attach, Spawn i Spawn & Run (da se hook-uje pre ranog onCreate() logike).
• Skriptovanje: editor, prevlačenje i ispuštanje .js, uvoz iz CodeShare, preuzimanje skripti i logova sesije.
• Udaljeni serveri: ./frida-server -l 0.0.0.0:27042 -D izlaže ga na mreži tako da se frida-ui može povezati bez ADB.

Frida server vs. Gadget (root vs. no-root)

Dva uobičajena načina za instrumentisanje Android aplikacija pomoću Frida:

• Frida server (rooted devices): Postavi i pokreni native daemon koji ti omogućava da se attach-uješ na bilo koji proces.
• Frida Gadget (no root): Ugradi Frida kao shared library unutar APK-a i automatski je učitaj u ciljni proces.

Frida server (rooted)

# Download the matching frida-server binary for your device's arch
# https://github.com/frida/frida/releases
adb root
adb push frida-server-<ver>-android-<arch> /data/local/tmp/frida-server
adb shell chmod 755 /data/local/tmp/frida-server
adb shell /data/local/tmp/frida-server &    # run at boot via init/magisk if desired

# From host, list processes and attach
frida-ps -Uai
frida -U -n com.example.app

Frida Gadget (no-root)

1. Raspakujte APK, dodajte gadget .so i konfiguraciju:

• Postavite libfrida-gadget.so u lib/<abi>/ (npr., lib/arm64-v8a/)
• Kreirajte assets/frida-gadget.config sa podešavanjima za učitavanje skripti

Primer frida-gadget.config

{
"interaction": { "type": "script", "path": "/sdcard/ssl-bypass.js" },
"runtime": { "logFile": "/sdcard/frida-gadget.log" }
}

2. Referencirajte/učitajte gadget tako da se inicijalizuje rano:

• Najlakše: Dodajte mali Java stub koji poziva System.loadLibrary(“frida-gadget”) u Application.onCreate(), ili koristite native lib loading koji je već prisutan.

3. Ponovo zapakujte i potpišite APK, zatim instalirajte:

apktool d app.apk -o app_m
# ... add gadget .so and config ...
apktool b app_m -o app_gadget.apk
uber-apk-signer -a app_gadget.apk -o out_signed
adb install -r out_signed/app_gadget-aligned-debugSigned.apk

4. Priključi se sa hosta na gadget proces:

frida-ps -Uai
frida -U -n com.example.app

Notes

• Gadget is detected by some protections; keep names/paths stealthy and load late/conditionally if needed.
• On hardened apps, prefer rooted testing with server + late attach, or combine with Magisk/Zygisk hiding.

JDWP-based Frida injection without root/repackaging (frida-jdwp-loader)

If the APK is debuggable (android:debuggable=“true”), you can attach over JDWP and inject a native library at a Java breakpoint. No root and no APK repackaging.

• Repo: https://github.com/frankheat/frida-jdwp-loader
• Requirements: ADB, Python 3, USB/Wireless debugging. App must be debuggable (emulator with ro.debuggable=1, rooted device with resetprop, or rebuild manifest).

Quick start:

git clone https://github.com/frankheat/frida-jdwp-loader.git
cd frida-jdwp-loader
# Inject frida-gadget.so into a debuggable target
python frida-jdwp-loader.py frida -n com.example.myapplication
# Keep the breakpoint thread suspended for early hooks
python frida-jdwp-loader.py frida -n com.example.myapplication -s
# Networkless: run a local agent script via Gadget "script" mode
python frida-jdwp-loader.py frida -n com.example.myapplication -i script -l script.js

Notes

• Modes: spawn (break at Application.onCreate) or attach (break at Activity.onStart). Use -b to set a specific Java method, -g to select Gadget version/path, -p to choose JDWP port.
• Listen mode: prosledite Gadget (podrazumevano 127.0.0.1:27042) po potrebi: adb forward tcp:27042 tcp:27042; zatim frida-ps -H 127.0.0.1:27042.
• Ovo koristi JDWP debugging. Rizik je isporuka debuggable build-ova ili izlaganje JDWP.

Self-contained agent + Gadget embedding (Frida 17+; automated with Objection)

Frida 17 je uklonio ugrađene Java/ObjC bridges iz GumJS. Ako vaš agent hook-uje Java, morate uključiti Java bridge unutar vašeg bundle-a.

1. Napravite Frida agent (TypeScript) i uključite Java bridge

# Scaffolding
frida-create -t agent -o mod
cd mod && npm install
# Install the Java bridge for Frida 17+
npm install frida-java-bridge
# Dev loop (optional live-reload via REPL)
npm run watch

Minimalni Java hook (prisiljava bacanja kockica na 1):

import Java from "frida-java-bridge";

Java.perform(function () {
var dicer = Java.use("org.secuso.privacyfriendlydicer.dicer.Dicer");
dicer.rollDice.implementation = function (numDice: number, numFaces: number) {
return Array(numDice).fill(1);
};
});

Izgradite jedan bundle za ugradnju:

npm run build    # produces _agent.js via frida-compile

Brzi USB test (opciono):

frida -U -f org.secuso.privacyfriendlydicer -l _agent.js

2. Podesite Gadget da automatski učitava vaš skript Objection’s patcher očekuje Gadget config; kada koristite script mode, navedite putanju na disku unutar APK lib dir:

{
"interaction": {
"type": "script",
"path": "libfrida-gadget.script.so"
}
}

3. Automatizujte APK patching pomoću Objection

# Embed Gadget, config, and your compiled agent into the APK; rebuild and sign
objection patchapk -s org.secuso.privacyfriendlydicer.apk \
-c gadget-config.json \
-l mod/_agent.js \
--use-aapt2

Šta patchapk radi (na visokom nivou):

• Detektuje ABI uređaja (npr. arm64-v8a) i preuzima odgovarajući Gadget
• Po potrebi dodaje android.permission.INTERNET
• Injektuje statički inicijalizator klase koji poziva System.loadLibrary(“frida-gadget”) u launch activity
• Smešta sledeće pod lib/<abi>/:
• libfrida-gadget.so
• libfrida-gadget.config.so (serijalizovana konfiguracija)
• libfrida-gadget.script.so (vaš _agent.js)

Primer injektovanog smali (statički inicijalizator):

.method static constructor <clinit>()V
.locals 1
const-string v0, "frida-gadget"
invoke-static {v0}, Ljava/lang/System;->loadLibrary(Ljava/lang/String;)V
return-void
.end method

4. Proverite repack

apktool d org.secuso.privacyfriendlydicer.apk
apktool d org.secuso.privacyfriendlydicer.objection.apk
# Inspect differences
diff -r org.secuso.privacyfriendlydicer org.secuso.privacyfriendlydicer.objection

Očekivane promene:

• AndroidManifest.xml može da sadrži <uses-permission android:name="android.permission.INTERNET"/>
• Nove nativne biblioteke u lib/<abi>/ kao gore
• smali fajl pokretne aktivnosti sadrži statički <clinit> koji poziva System.loadLibrary(“frida-gadget”)

5. Split APKs

• Patch-uj osnovni APK (onaj koji deklariše MAIN/LAUNCHER aktivnost)
• Ponovo potpiši preostale split APK-ove istim ključem:

objection signapk split1.apk split2.apk ...

• Instalirajte splits zajedno:

adb install-multiple split1.apk split2.apk ...

• Za distribuciju, možete spojiti splits u jedan APK pomoću APKEditor, zatim align/sign

Uklanjanje FLAG_SECURE tokom dinamičke analize

Aplikacije koje pozivaju getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE) onemogućavaju screenshot-ove, remote displays i čak Android-ove recent-task snapshots. Kada je Freedom Chat nametnuo ovaj flag jedini način da se dokumentuju leaks bio je manipulacija prozorom u runtime-u. Pouzdan obrazac je:

• Hook-ujte svaki Window overload koji može ponovo postaviti flag (setFlags, addFlags, setAttributes) i maskirajte bit 0x00002000 (WindowManager.LayoutParams.FLAG_SECURE).
• Nakon svakog resume-a aktivnosti, rasporedite poziv na UI-thread da pozove clearFlags(FLAG_SECURE) tako da Dialogs/Fragments kreirani kasnije naslede otključano stanje.
• Aplikacije izgrađene sa React Native / Flutter često kreiraju ugnježdene prozore; hook-ujte android.app.Dialog/android.view.View helpere ili prošetajte getWindow().peekDecorView() ako i dalje vidite crne frame-ove.

</details>

Pokrenite skriptu sa `frida -U -f <package> -l disable-flag-secure.js --no-pause`, interagujte sa UI-jem, i screenshot-ovi i snimci će ponovo raditi. Pošto se sve dešava na UI niti, nema treperenja, a i dalje možete kombinovati hook sa HTTP Toolkit/Burp da zabeležite saobraćaj koji je otkrio `/channel` PIN leak.

## Dynamic DEX dumping / unpacking with clsdumper (Frida)

`clsdumper` je Frida-based dinamički **DEX/class dumper** koji opstaje u zaštićenim aplikacijama kombinovanjem anti-Frida pre-stage-a sa native i Java strategijama otkrivanja (radi čak i ako `Java.perform()` umre). Zahtevi: Python 3.10+, rooted uređaj sa `frida-server` pokrenutim, USB ili `--host` TCP konekcija.

**Instalacija & brzo korišćenje**
```bash
pip install clsdumper
# Attach to a running app
clsdumper com.example.app
# Spawn first (hooks before early loaders)
clsdumper com.example.app --spawn
# Select strategies
clsdumper com.example.app --strategies fart_dump,oat_extract

dump_<target>/
dex/classes_001.dex ...
classes/                 # only when --extract-classes
metadata.json            # strategy per hit + hashes

frida-ps -U

#Basic frida hooking
frida -l disableRoot.js -f owasp.mstg.uncrackable1

#Hooking before starting the app
frida -U --no-pause -l disableRoot.js -f owasp.mstg.uncrackable1
#The --no-pause and -f options allow the app to be spawned automatically,
#frozen so that the instrumentation can occur, and the automatically
#continue execution with our modified code.

import frida, sys

jscode = open(sys.argv[0]).read()
process = frida.get_usb_device().attach('infosecadventures.fridademo')
script = process.create_script(jscode)
print('[ * ] Running Frida Demo application')
script.load()
sys.stdin.read()

Java.perform(function () {
rootcheck1.a.overload().implementation = function () {
return false;
};
});

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  :)")
}

var mainactivity = Java.use("sg.vantagepoint.uncrackable1.MainActivity")
mainactivity.onStart.overload().implementation = function () {
send("MainActivity.onStart() HIT!!!")
var ret = this.onStart.overload().call(this)
}
mainactivity.onCreate.overload("android.os.Bundle").implementation = function (
var_0
) {
send("MainActivity.onCreate() HIT!!!")
var ret = this.onCreate.overload("android.os.Bundle").call(this, var_0)
}

var activity = Java.use("android.app.Activity")
activity.onCreate.overload("android.os.Bundle").implementation = function (
var_0
) {
send("Activity HIT!!!")
var ret = this.onCreate.overload("android.os.Bundle").call(this, var_0)
}

</details>

### Hooking funkcija i pozivanje istih sa našim inputom

Hook funkciju koja prima string i pozovite je sa drugim stringom (iz [here](https://11x256.github.io/Frida-hooking-android-part-2/))
```javascript
var string_class = Java.use("java.lang.String") // get a JS wrapper for java's String class

my_class.fun.overload("java.lang.String").implementation = function (x) {
//hooking the new function
var my_string = string_class.$new("My TeSt String#####") //creating a new String by using `new` operator
console.log("Original arg: " + x)
var ret = this.fun(my_string) // calling the original function with the new String, and putting its return value in ret variable
console.log("Return value: " + ret)
return ret
}

Java.choose("com.example.a11x256.frida_test.my_activity", {
onMatch: function (instance) {
//This function will be called for every instance found by frida
console.log("Found instance: " + instance)
console.log("Result of secret func: " + instance.secret())
},
onComplete: function () {},
})