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berendjanwever's profile
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
@berendjanwever

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𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹

@berendjanwever

ASCII art evangelist | motivational coder | full stack IoT blockchain machine learning cyber-cloud threat actor | berendj@nwever.nl | http://skylined.nl/gpg 

 🇳🇱 The Netherlands
blog.skylined.nl
Joined June 2009

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    𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017

    𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹 Retweeted 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹

    I've looked at trying to do this for indirect calls with hardcoded addresses, but found many were to wrapper code that did "JMP register"...https://twitter.com/berendjanwever/status/855379369832964096 …

    𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹 added,

    𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹 @berendjanwever
    Replying to @berendjanwever
    Works only for direct calls (opcode E8). > u [ret_addr]-5 L1 xxxxxxxx E8xxxxxxxx CALL module!Symbol Upcoming BugId implements this trick.
    5:52 AM - 21 Apr 2017
    • 6 Likes
    • Jesse V. Burke 23kid Trav mario_vilas.py 🐊
    1 reply 0 retweets 6 likes
      1. New conversation
      2. Tavis Ormandy‏Verified account @taviso 21 Apr 2017
        Replying to @berendjanwever

        Did you know you can do `ub foo L1` (Unassemble Backwards)? That way you don't need to guess the length of the call instruction...

        2 replies 0 retweets 7 likes
      3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @taviso

        yeah, but it is slower and an e8 call is always 5 bytes :)

        1 reply 0 retweets 2 likes
      4. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @berendjanwever @taviso

        Since it's automated, I try to avoid having to parse errors: .if (by(«ra»-5) == 0xe8) { .if ($vvalid(«ra»-4,4)) { u «ra»-5 L1 } }

        1 reply 0 retweets 0 likes
      5. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @berendjanwever @taviso

        I've found the return address can be 0x41414141 in some cases, and `ub 0x41414141 L1` tends to throws an error. :D

        1 reply 0 retweets 1 like
      6. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @berendjanwever @taviso

        sanity checks are possible bc. a valid call should point *exactly* to a symbol, making false positives in a corrupted state highly unlikely

        1 reply 0 retweets 1 like
      7. Tavis Ormandy‏Verified account @taviso 21 Apr 2017
        Replying to @berendjanwever

        You mean you discard it if it doesn't point to a debug symbol?

        2 replies 0 retweets 1 like
      8. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @taviso

        code in small branches can be stored away from the main func and may not get marked with a symbol. Windbg returns whatever symbol is close.

        2 replies 0 retweets 1 like
      9. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever 21 Apr 2017
        Replying to @berendjanwever @taviso

        so the symbol may be wrong. This is a way to get a better alternative in some cases (direct call), but not all (all other types of call).

        0 replies 0 retweets 0 likes
      10. End of conversation

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