Tags: uut multipart reversing
Rating:
# 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:
```java
protected 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).
```console
base32 --decode <<< OBQXE5BAGIQGS4ZAHIQHE43UOV3HO6DZPJQWCYTDMRSWMZ3I
part 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 matches
Binary file ./lib/x86_64/libplasma.so matches
Binary file ./lib/arm64-v8a/libplasma.so matches
Binary 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:
```console
base32 --decode <<< OBQXE5BAGEQGS4ZAHIQFKVKUINKEM63NMQ2SQYLCMNSGKZTH
part 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...
```console
base32 --decode <<< OBQXE5BAGQQGS4ZAHIQHI5LWO54HS6TBMFVGQ6LUM53GIKL5
part 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.
```xml
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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
*Decode that shit!*
```console
base32 --decode <<< OBQXE5BAGMQGS4ZAHIQHG5DVOZ3XQ6L2MFQWEY3EMVTGO2DJ
part 3 is : stuvwxyzaabcdefghi
```
After joining everything, we get the flag:
**UUTCTF{md5(abcdefgrstuvwxyzaabcdefghstuvwxyzaabcdefghituvwxyzaajhytgvd)}**
