Mafunzo ya Frida

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Usakinishaji

Sakinisha frida tools:

pip install frida-tools
pip install frida

Pakua na sakinisha kwenye android frida server (Download the latest release).
Amri moja ya kuanzisha adb tena katika mode ya root, kuungana nayo, kupakia frida-server, kumpa ruhusa za utekelezaji na kuiendesha kwa background:

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 &"

Angalia ikiwa inafanya kazi:

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

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

Njia mbili za kawaida za ku-instrument programu za Android kwa Frida:

• Frida server (rooted devices): Push na run native daemon inayokuruhusu ku-attach kwa process yoyote.
• Frida Gadget (no root): Bundle Frida kama shared library ndani ya APK na auto-load ndani ya target process.

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. Toa APK, ongeza gadget .so na config:

• Weka libfrida-gadget.so kwenye lib/<abi>/ (kwa mfano, lib/arm64-v8a/)
• Unda assets/frida-gadget.config na mipangilio ya kupakia script yako

Example frida-gadget.config

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

2. Rejelea/pakia gadget ili ianzishwe mapema:

• Rahisi zaidi: Ongeza stub ndogo ya Java kwa System.loadLibrary(“frida-gadget”) katika Application.onCreate(), au tumia upakiaji wa native lib uliopo tayari.

3. Pakia upya na saini APK, kisha weka:

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. Unganisha kutoka kwa host hadi gadget process:

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

Vidokezo

• Gadget hupatikana na baadhi ya ulinzi; weka majina/paths kwa hila na pakia kuchelewa/kimasharti ikiwa inahitajika.
• Kwa apps zilizoimarishwa (hardened), pendelea kujaribu kwenye device iliyopata root (rooted) kwa server + late attach, au changanya na kuficha kwa Magisk/Zygisk.

Kuingiza Frida kwa JDWP bila root/repackaging (frida-jdwp-loader)

Ikiwa APK ni debuggable (android:debuggable=“true”), unaweza kuungana kwa JDWP na kuingiza native library kwenye breakpoint ya Java. Hakuna root na hakuna repackaging ya APK.

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

Anza haraka

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

• Hali: spawn (break at Application.onCreate) au attach (break at Activity.onStart). Tumia -b kuweka specific Java method, -g kuchagua Gadget version/path, -p kuchagua JDWP port.
• Hali ya kusikiliza: forward Gadget (default 127.0.0.1:27042) ikiwa inahitajika: adb forward tcp:27042 tcp:27042; kisha frida-ps -H 127.0.0.1:27042.
• Hii inategemea JDWP debugging. Hatari ni kusafirisha debuggable builds au kufichua JDWP.

Agent mwenyewe + kuingiza Gadget (Frida 17+; otomatiki na Objection)

Frida 17 imeondoa the built-in Java/ObjC bridges kutoka GumJS. Ikiwa agent yako ina-hook Java, lazima ujumuishe the Java bridge ndani ya bundle yako.

1. Tengeneza Frida agent (TypeScript) na ujumuishe the 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

Hook ya Java ndogo (inalazimisha matokeo ya kupiga dadi kuwa 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);
};
});

Tengeneza kifurushi kimoja kwa ajili ya kuingiza:

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

Jaribio fupi la USB (hiari):

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

2. Sanidi Gadget ili ianze kupakia script yako moja kwa moja Objection’s patcher inatarajia Gadget config; unapotumia script mode, bainisha njia kwenye diski ndani ya APK lib dir:

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

3. Otomatisha APK patching na 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

Kile patchapk kinachofanya (kwa kiwango cha juu):

• Inatambua ABI ya kifaa (mfano, arm64-v8a) na hupakua Gadget inayofanana
• Kwa hiari huongeza android.permission.INTERNET inapohitajika
• Inaingiza static class initializer inayoitisha System.loadLibrary(“frida-gadget”) ndani ya launch activity
• Inaweka yafuatayo chini ya lib/<abi>/:
• libfrida-gadget.so
• libfrida-gadget.config.so (serialized config)
• libfrida-gadget.script.so (your _agent.js)

Mfano wa smali iliyoungizwa (static initializer):

.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. Thibitisha 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

• AndroidManifest.xml inaweza kujumuisha <uses-permission android:name="android.permission.INTERNET"/>
• Maktaba za asili mpya chini ya lib/<abi>/ kama ilivyo hapo juu
• smali ya activity inayoweza kuzinduliwa ina static <clinit> inayoitisha System.loadLibrary(“frida-gadget”)

5. APKs zilizogawanyika

• Rekebisha APK ya msingi (ile inayotangaza activity ya MAIN/LAUNCHER)
• Saini tena splits zilizobaki kwa key sawa:

objection signapk split1.apk split2.apk ...

• Sakinisha splits pamoja:

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

• Kwa usambazaji, unaweza kuunganisha splits kuwa APK moja kwa kutumia APKEditor, kisha align/sign

Mafunzo

Mafunzo 1

Kutoka: https://medium.com/infosec-adventures/introduction-to-frida-5a3f51595ca1
APK: https://github.com/t0thkr1s/frida-demo/releases
Msimbo wa chanzo: https://github.com/t0thkr1s/frida-demo

Fuata kiungo kusoma.

Mafunzo 2

Kutoka: https://11x256.github.io/Frida-hooking-android-part-2/ (Sehemu 2, 3 & 4)
APKs na msimbo wa chanzo: https://github.com/11x256/frida-android-examples

Fuata kiungo kusoma.

Mafunzo 3

Kutoka: https://joshspicer.com/android-frida-1
APK: https://github.com/OWASP/owasp-mstg/blob/master/Crackmes/Android/Level_01/UnCrackable-Level1.apk

Fuata kiungo kusoma.

Unaweza kupata skripti za Frida zaidi hapa: https://codeshare.frida.re/

Mifano ya Haraka

Kupiga Frida kutoka kwenye mstari wa amri

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.

Skripti ya Msingi ya Python

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()

Hooking functions bila vigezo

Hook function a() ya darasa sg.vantagepoint.a.c

Java.perform(function () {
rootcheck1.a.overload().implementation = function() {
send("sg.vantagepoint.a.c.a()Z   Root check 1 HIT!  su.exists()")
return false;
};
});

Hook java exit()

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  :)")
}

Hook MainActivity .onStart() na .onCreate()

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)
}

Hook android .onCreate()

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)
}

Hooking functions with parameters na kupata thamani

Hooking a decryption function. Print the input, uita original function ili decrypt input na mwishowe, print plain data:

</details>

### Hooking functions and calling them with our input

Hook function inayopokea string na ui-call na string nyingine (from [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 () {},
})