# UUT CTF 2019 - MultiPart
## Challenge> Find the flag parts and capture the final flag!
We are given an apk file, so we need to decompile it. We can use [jadx](https://github.com/skylot/jadx/) to get the source code, or use an [online tool](http://www.javadecompilers.com/apk).
After a quick examination of the project, inside `PlasmaView.java`, we find:
```javaprotected void onDraw(Canvas canvas) {    renderPlasma(this.mBitmap, System.currentTimeMillis() - this.mStartTime);    canvas.drawBitmap(this.mBitmap, 0.0f, 0.0f, null);    invalidate();    this.counter++;    if (this.counter == 100000) {        Log.d("plasma :", "OBQXE5BAGIQGS4ZAHIQHE43UOV3HO6DZPJQWCYTDMRSWMZ3I");    }}```
That sure *looks like base64* encoded string, but only uppercase letters. Well, it's not *base64*. 
When you find something that smells like *base64*, but it is all caps and some numbers (letters [A-Z] and numbers [2-7]), it's probably **base32** [[1]](https://tools.ietf.org/html/rfc4648#page-8) [[2]](https://en.wikipedia.org/wiki/Base32).
```consolebase32 --decode <<< OBQXE5BAGIQGS4ZAHIQHE43UOV3HO6DZPJQWCYTDMRSWMZ3Ipart 2 is : rstuvwxyzaabcdefgh```
Awesome! We have got the second part of the flag, and we also know its format: `part N is : xxxxxxxxxx`. Now let's get the rest.
Because we are lazy, we are just going to search for `OBQXE5BA`, *base32 encoded `"part "`*,  and see if anything else comes up.
```console# grep -Rin "OBQXE5BA" ././res/layout/activity_main.xml:4:    <TextView android:textColor="#00ff5999" android:id="@id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="OBQXE5BAGEQGS4ZAHIQFKVKUINKEM63NMQ2SQYLCMNSGKZTH" />Binary file ./lib/armeabi-v7a/libplasma.so matchesBinary file ./lib/x86_64/libplasma.so matchesBinary file ./lib/arm64-v8a/libplasma.so matchesBinary file ./lib/x86/libplasma.so matches./resources/res/layout/activity_main.xml:3:    <TextView android:textColor="#00ff5999" android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="OBQXE5BAGEQGS4ZAHIQFKVKUINKEM63NMQ2SQYLCMNSGKZTH"/>./sources/com/example/plasma/PlasmaView.java:35:            Log.d("plasma :", "OBQXE5BAGIQGS4ZAHIQHE43UOV3HO6DZPJQWCYTDMRSWMZ3I");```
**Nice!** There seems to be more base32 *"part "*. Let's check them out.
First hit matches the string inside a *TextView*: ```xml<TextView android:textColor="#00ff5999" android:id="@id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="OBQXE5BAGEQGS4ZAHIQFKVKUINKEM63NMQ2SQYLCMNSGKZTH" />```After decoding it we get:```consolebase32 --decode <<< OBQXE5BAGEQGS4ZAHIQFKVKUINKEM63NMQ2SQYLCMNSGKZTHpart 1 is : UUTCTF{md5(abcdefg```**Grrreat!** Now we've got the first part of the flag!
Our second match is inside `libplasma.so`. So there is something with `OBQXE5BA` inside the compiled libraries _(Shared Objects)_. Let's peek inside these binaries real quick. 
```console# strings ./lib/x86_64/libplasma.so | grep "OBQXE5BA"	!	@OBQXE5BAGQQGS4ZAHIQHI5LWO54HS6TBMFVGQ6LUM53GIKL5```Decode it once more...```consolebase32 --decode <<< OBQXE5BAGQQGS4ZAHIQHI5LWO54HS6TBMFVGQ6LUM53GIKL5part 4 is : tuvwxyzaajhytgvd)}```***Yatta!*** We've got the 4th part. Only one is missing, the 3rd part. But it does not seem to be in text form. So... *where the hell is it?*
This actually took me some time. But after looking around a little while, I found something that caught my eye inside `./resources/res/drawable-anydpi-v21/ic_uutctf.xml`: a **very** intricate vector drawing.
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I don't have an android emulator. But I know a **vector path** works just like a **svg path**. So I wrote a simple html that draws the `android:pathData`.
```html <html>  <body>    <svg height="564" width="564">      <path d="android:pathData" />    </svg>  </body></html>```
The result is the las missing part![android:pathData](https://raw.github.com/prete/ctf-writeups/master/2019/UUT-CTF/multipart/svg-path.png)
*Decode that shit!*```consolebase32 --decode <<< OBQXE5BAGMQGS4ZAHIQHG5DVOZ3XQ6L2MFQWEY3EMVTGO2DJpart 3 is : stuvwxyzaabcdefghi```
After joining everything, we get the flag:**UUTCTF{md5(abcdefgrstuvwxyzaabcdefghstuvwxyzaabcdefghituvwxyzaajhytgvd)}**