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Perform an action when some value is written to any address

 
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hyuk9
How do I cheat?
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Joined: 08 Sep 2017
Posts: 4
PostPosted: Wed Apr 25, 2018 10:51 pm    Post subject: Perform an action when some value is written to any address Reply with quote
I am trying to perform some actions (e.g. log a stacktrace, log registers, etc.) whenever a particular value (e.g. 0x30) is written/read to/from *any* memory address.

Is there a way to do this?

To give some context, I'm trying to locate a data structure that's in memory. I have several integer values that I know are in the data structure, but they are fairly low numbers (e.g. 0x30) that show up thousands of times during a scan.

For this reason, I'm trying to reduce the haystack somehow.

Any ideas?
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Dark Byte
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Joined: 09 May 2003
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Location: The netherlands
PostPosted: Thu Apr 26, 2018 12:25 am    Post subject: Reply with quote
Code:

setBreakpoint(startoftheregion,sizeoftheregion,bptWrite,bpmException,function()
   get the previous opcode for RIP
  disassemble that
  check if it has a [xxx] part
  interpret xxx
  read the value at xxd
  is it the value ? (0x30)
  yes? return 0
  no? debug_continueFromBreakpoint(co_run) return 1
end)

also it will be so slow that it will take an hour to even register one key input

perhaps it helps if you can pinpoint the region
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