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Apktool is a tool for reverse engineering 3rd party, closed, binary Android apps. It can decode resources to nearly original form and rebuild them after making some modifications; it makes possible to debug smali code step by step. Also it makes working with an app easier because of project-like file structure and automation of some repetitive tasks like building apk, etc.



General options

Usage: apktool [options]
prints advance information.
prints the version then exits

Install framework

usage: apktool if|install-framework [options] <framework.apk>
-p,--frame-path <dir>
Stores framework files into <dir>.
-t,--tag <tag>
Tag frameworks using <tag>.

Decode options

usage: apktool d[ecode] [options] <file_apk>
Force delete destination directory.
-o,--output <dir>
The name of folder that gets written. Default is apk.out
-p,--frame-path <dir>
Uses framework files located in <dir>.
Do not decode resources.
Do not decode sources.
-t,--frame-tag <tag>
Uses framework files tagged by <tag>.

Build options

usage: apktool b[uild] [options] <app_path>
Skip changes detection and build all files.
-o,--output <dir>
The name of apk that gets written. Default is dist/name .apk
-p,--frame-path <dir>
Uses framework files located in <dir>



The following command:

C:\_malware>"c:\Program Files\Java\jre1.8.0_51\bin\java.exe" -jar apktool_2.0.1.jar d android.apk
I: Using Apktool 2.0.1 on android.apk
I: Loading resource table...
I: Decoding AndroidManifest.xml with resources...
I: Loading resource table from file: C:\Users\My User\apktool\framework\1.apk
I: Regular manifest package...
I: Decoding file-resources...
I: Decoding values */* XMLs...
I: Baksmaling classes.dex...
I: Copying assets and libs...
I: Copying unknown files...
I: Copying original files...

...results in the following structure:

├── AndroidManifest.xml
├── apktool.yml
├── lib
│   └── armeabi
│       └── libvalidate.so
├── original
│   ├── AndroidManifest.xml
│   └── META-INF
│       ├── CERT.RSA
│       ├── CERT.SF
│       └── MANIFEST.MF
├── res
│   └── [...REMOVED...]
└── smali
    ├── android
    │   └── [...REMOVED...]
    └── com
        └── flareon
            └── flare
                ├── BuildConfig.smali
                ├── MainActivity.smali
                ├── R$anim.smali
                ├── R$attr.smali
                ├── R$bool.smali
                ├── R$color.smali
                ├── R$dimen.smali
                ├── R$drawable.smali
                ├── R$id.smali
                ├── R$integer.smali
                ├── R$layout.smali
                ├── R$menu.smali
                ├── R$mipmap.smali
                ├── R.smali
                ├── R$string.smali
                ├── R$styleable.smali
                ├── R$style.smali
                └── ValidateActivity.smali

Below is the content of the ValidateActivity.smali file:

.class public Lcom/flareon/flare/ValidateActivity;
.super Landroid/support/v7/app/ActionBarActivity;
.source "ValidateActivity.java"

# direct methods
.method static constructor <clinit>()V
    .locals 1

    .line 42
    const-string v0, "validate"

    invoke-static {v0}, Ljava/lang/System;->loadLibrary(Ljava/lang/String;)V

    .line 43
.end method

.method public constructor <init>()V
    .locals 0

    .line 14
    invoke-direct {p0}, Landroid/support/v7/app/ActionBarActivity;-><init>()V

.end method

# virtual methods
.method protected onCreate(Landroid/os/Bundle;)V
    .locals 6
    .param p1, "savedInstanceState"    # Landroid/os/Bundle;

    .line 18
    invoke-super {p0, p1}, Landroid/support/v7/app/ActionBarActivity;->onCreate(Landroid/os/Bundle;)V

    .line 20
    new-instance v3, Landroid/widget/TextView;

    invoke-direct {v3, p0}, Landroid/widget/TextView;-><init>(Landroid/content/Context;)V

    .line 21
    .local v3, "textView":Landroid/widget/TextView;
    const/high16 v5, 0x42200000    # 40.0f

    invoke-virtual {v3, v5}, Landroid/widget/TextView;->setTextSize(F)V

    .line 22
    const/16 v5, 0x11

    invoke-virtual {v3, v5}, Landroid/widget/TextView;->setGravity(I)V

    .line 25
    invoke-virtual {p0}, Lcom/flareon/flare/ValidateActivity;->getIntent()Landroid/content/Intent;

    move-result-object v1

    .line 26
    .local v1, "intent":Landroid/content/Intent;
    const-string v5, "com.flare_on.flare.MESSAGE"

    invoke-virtual {v1, v5}, Landroid/content/Intent;->getStringExtra(Ljava/lang/String;)Ljava/lang/String;

    move-result-object v4

    .line 27
    .local v4, "userInput":Ljava/lang/String;
    const-string v5, "US-ASCII"

    invoke-static {v5}, Ljava/nio/charset/Charset;->forName(Ljava/lang/String;)Ljava/nio/charset/Charset;

    move-result-object v5

    invoke-virtual {v5}, Ljava/nio/charset/Charset;->newEncoder()Ljava/nio/charset/CharsetEncoder;

    move-result-object v0

    .line 28
    .local v0, "asciiEnc":Ljava/nio/charset/CharsetEncoder;
    invoke-virtual {v0, v4}, Ljava/nio/charset/CharsetEncoder;->canEncode(Ljava/lang/CharSequence;)Z

    move-result v5

    if-eqz v5, :cond_0

    .line 30
    invoke-virtual {p0, v4}, Lcom/flareon/flare/ValidateActivity;->validate(Ljava/lang/String;)Ljava/lang/String;

    move-result-object v2

    .line 31
    .local v2, "js":Ljava/lang/String;
    invoke-virtual {v3, v2}, Landroid/widget/TextView;->setText(Ljava/lang/CharSequence;)V

    .line 35
    .end local v2    # "js":Ljava/lang/String;
    invoke-virtual {p0, v3}, Lcom/flareon/flare/ValidateActivity;->setContentView(Landroid/view/View;)V

    .line 36

    .line 33
    const-string v5, "No"

    invoke-virtual {v3, v5}, Landroid/widget/TextView;->setText(Ljava/lang/CharSequence;)V

    goto :goto_0
.end method

.method public native validate(Ljava/lang/String;)Ljava/lang/String;
.end method