Tweaked Tweet

Challenge

(Mobile Challenge)

Blue little birdie create a fancy message, please tweet it!

Solution

When we click the button, it prepares a tweet for us:

We check the decompiled sources and see the code to generate the tweet:

  
private void startTweakedTweet() {
    try {
        startActivity(new Intent("android.intent.action.VIEW", Uri.parse("https://twitter.com/intent/tweet?text=%23%EF%BC%A8a%EF%BD%83%EF%BD%8By%CE%95%EF%BD%81ste%EF%BD%92%E2%80%A9201%EF%BC%97%E2%80%A9%E2%85%B0%EF%BD%93%E2%80%80a%E2%80%84l%EF%BD%8F%EF%BD%94%E2%80%80%CE%BFf%E2%80%89%EF%BD%86un%EF%BC%81%E2%80%A8%23%D1%81tf%E2%80%88%23%EF%BD%88%EF%BD%81%CF%B2king-lab")));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

The tweet text:

#ＨaｃｋyΕａsteｒ 201７ ⅰｓ a lｏｔ οf ｆun！ #сtf #ｈａϲking-lab

in hex:

23efbca861efbd83efbd8b79ce95efbd81737465efbd92e280a9323031efbc97e280
a9e285b0efbd93e2808061e280846cefbd8fefbd94e28080cebf66e28089efbd8675
6eefbc81e280a823d1817466e2808823efbd88efbd81cfb26b696e672d6c6162

Flag

Edit on GitHub