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Reversing.kr -- Flash Encrypt

1. Challenge

Just a file and a flashenc.swf:

Please goto http://reversing.kr/challenge.php to download.

2. Solution

First let's try to play this flash file.

  1. Create a html file at the folder where flashenc.swf locates with the following content:
<object>
    <embed src="flashenc.swf" width="100%" height="100%"></embed>
</object>

  1. Open this html file with Microsoft Edge or Google Chrome.

    Okay, with only a textbox and a button.

Now use ffdec to decompile.

Don't forget to check Automatic deobfuscation

  1. We can see that object 4 and object 6 are added in frame 1 while object 4 just is a button so we can go to see the corresponding script.

  2. We can see spw == 1456. So just input 1456 and click button.

  3. The next frame is frame 3 and we can see object 9 are added.

  4. Go to see the corresponding script and find the pass text.

This challenge is simple. The pass texts are:

  1. 1456

  2. 25

  3. 44

  4. 8

  5. 88

  6. 20546

Finally you will see the flag.