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j00ru's profile
j00ru//vx
j00ru//vx
j00ru//vx
@j00ru

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j00ru//vx

@j00ru

Windows hacker & vulnerability researcher. Google Project Zero. @DragonSectorCTF

Poland
j00ru.vexillium.org
Joined April 2010

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    j00ru//vx‏ @j00ru 23 Sep 2019
    • Report Tweet

    I uploaded my BadType challenge from last weekend's Dragon CTF Teaser on GitHub. It's a medium-difficulty RE task for Windows x64 (worth 400 pts), solved by 9⃣ teams during the competition.https://github.com/j00ru/ctf-tasks/tree/master/Dragon%20CTF%202019/Teaser/BadType …

    4:59 AM - 23 Sep 2019
    • 39 Retweets
    • 156 Likes
    • Nakhyun Kim lofiboy werewolfes Mak Man Cody M Brendan H Ghetto@平将門モードw Hacks dzikri ramdhani
    2 replies 39 retweets 156 likes
      1. j00ru//vx‏ @j00ru 23 Sep 2019
        • Report Tweet

        Congrats to meltdown, Bushwhackers, Tasteless, p4, !SpamAndHex, PPP, Shellphish, pwndevils and Never Stop Exploiting for solving it in time, and of course to everyone at the top of the scoreboard😀

        0 replies 0 retweets 13 likes
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      2. Anatoly Korniltsev‏ @korniltsev 24 Sep 2019
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        Replying to @j00ru

        How do you decompile the font? I tried ttx but hit https://github.com/fonttools/fonttools/blob/master/Lib/fontTools/misc/psCharStrings.py#L391 … Had to write small & dirty disassembler myself :(

        1 reply 0 retweets 0 likes
      3. j00ru//vx‏ @j00ru 24 Sep 2019
        • Report Tweet
        Replying to @korniltsev

        Wow impressive, that's a valid way too. ttx used out-of-the-box throws these exceptions, but you can nop out the invocation of the op_ functions, or the "raise" inside of them, and it should decompile fine then. That's what @dsredford did while testing the task.

        0 replies 0 retweets 2 likes
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