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<span class="title">01 September 2024 <span class="count">(55 messages)</span></span>
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@instw0
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<a class="id" href="#7774">#7774</a>
<span class="date">07:09 AM, 01 Sep 2024</span>
</div>
<div class="text">
is it possible to use a hypervisor to track exception handling in windows?
<br />For example:
<br />try{
<br /> exception page fault
<br />}
<br />catch (err) {
<br />not debugger
<br />}.
<br />There is a tricky defense mechanism that causes a page error and is handled in the driver itself (Windbg does not see an exception)
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@HughEverett
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<a class="reply" href="2024-09.html#7774">↶ Reply to #7774</a>
<a class="id" href="#7775">#7775</a>
<span class="date">08:51 AM, 01 Sep 2024</span>
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<div class="text">
Yes. You can use the !exception command combined with the event short circuiting mechanism.
<br />
<br />By default, if an exception/fault/interrupt happens in the system, HyperDbg re-injects it to the guest.
<br />
<br />You can decide whether you want it to be injected to the guest and be handled by Windows or drop it and ignore it by short circuiting it.
<br />
<br />Please check:
<br />https://docs.hyperdbg.org/tips-and-tricks/misc/event-short-circuiting
</div>
<div class="media">
<a href="https://docs.hyperdbg.org/tips-and-tricks/misc/event-short-circuiting" rel="noreferer nopener nofollow">Event short-circuiting | HyperDbg Documentation</a>
<p>The event short-circuiting and ignoring mechanism in HyperDbg</p>
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@instw0
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<a class="reply" href="2024-09.html#7775">↶ Reply to #7775</a>
<a class="id" href="#7776">#7776</a>
<span class="date">09:10 AM, 01 Sep 2024</span>
</div>
<div class="text">
we don't need to ignore the exception, but we need to track where the handler of this exception is located (the code in catch).
</div>
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@HughEverett
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<a class="reply" href="2024-09.html#7776">↶ Reply to #7776</a>
<a class="id" href="#7777">#7777</a>
<span class="date">09:12 AM, 01 Sep 2024</span>
</div>
<div class="text">
So, you need to find the handler using a simple script using the same !exception command.
</div>
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@instw0
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<a class="reply" href="2024-09.html#7777">↶ Reply to #7777</a>
<a class="id" href="#7778">#7778</a>
<span class="date">09:15 AM, 01 Sep 2024</span>
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<div class="text">
Yes, that's right.... what should the script look like for !exception
</div>
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@HughEverett
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<a class="reply" href="2024-09.html#7778">↶ Reply to #7778</a>
<a class="id" href="#7779">#7779</a>
<span class="date">09:17 AM, 01 Sep 2024</span>
</div>
<div class="text">
I'm not sure how SEH works these days. A few years ago, it was like putting the address of SEH Handler in the stack but I'm not sure if it still works the same way.
</div>
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@HughEverett
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<a class="reply" href="2024-09.html#7778">↶ Reply to #7778</a>
<a class="id" href="#7780">#7780</a>
<span class="date">09:18 AM, 01 Sep 2024</span>
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<div class="text">
You need to check how Microsoft implemented the SEH in newer Windows versions.
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@instw0
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<a class="reply" href="2024-09.html#7780">↶ Reply to #7780</a>
<a class="id" href="#7781">#7781</a>
<span class="date">09:50 AM, 01 Sep 2024</span>
</div>
<div class="text">
I tried to put a breakpoint in windbg on the handler function in the idt table, but the system was hanging
</div>
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<a class="id" href="#7782">#7782</a>
<span class="date">09:53 AM, 01 Sep 2024</span>
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if I put a breakpoint through hyperdbg will I also get a hang?
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<a class="id" href="#7783">#7783</a>
<span class="date">10:19 AM, 01 Sep 2024</span>
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This is also a unique aspect of HyperDbg. You cannot trace instructions in ISRs (IDT functions) in WinDbg but you can do it in HyperDbg. 🙂
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<br />Make sure to use the instrumentation step-in instead of regular step-in.
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<br />https://docs.hyperdbg.org/commands/debugging-commands/i
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<a href="https://docs.hyperdbg.org/commands/debugging-commands/i" rel="noreferer nopener nofollow">i (instrumentation step-in) | HyperDbg Documentation</a>
<p>Description of the 'i' command in HyperDbg.</p>
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<a class="id" href="#7784">#7784</a>
<span class="date">10:19 AM, 01 Sep 2024</span>
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Nope. It's possible in HyperDbg. But it's not possible in WinDbg.
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<a class="id" href="#7785">#7785</a>
<span class="date">10:22 AM, 01 Sep 2024</span>
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But, there should be articles online that they already analyzed SEH. I think this way of analyzing SEH from IDT entries is so fundamental and time consuming. There should be better and easier ways for analyzing SEH. 🤔
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<a class="id" href="#7786">#7786</a>
<span class="date">10:24 AM, 01 Sep 2024</span>
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if we are talking about the driver, is there a VEH?
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<a class="id" href="#7787">#7787</a>
<span class="date">10:25 AM, 01 Sep 2024</span>
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VEH?
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<a class="id" href="#7788">#7788</a>
<span class="date">10:26 AM, 01 Sep 2024</span>
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vector exception handling in 64 windows
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<a class="id" href="#7789">#7789</a>
<span class="date">10:31 AM, 01 Sep 2024</span>
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Unfortunately, I'm not familiar with it.
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