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auto attach and auto break

 
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reverser69
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Posts: 106
PostPosted: Sat Nov 26, 2022 2:53 am    Post subject: auto attach and auto break Reply with quote
hi all

there is an app which executes another tiny exe with some parameters.
i want to stop right at the beginning of that tiny exe and start debugging.
i tried below Lua code, BP is set on right location (entry point) but that tiny exe gets terminated and i am not breaking on this spot.

Code:

PROCESS_NAME = 'XXX.exe'
--------
-------- Auto Attach
--------
local autoAttachTimer = nil ---- variable to hold timer object
local autoAttachTimerInterval = 100 ---- Timer intervals are in milliseconds
local autoAttachTimerTicks = 0 ---- variable to count number of times the timer has run
local autoAttachTimerTickMax = 5000 ---- Set to zero to disable ticks max
local function autoAttachTimer_tick(timer) ---- Timer tick call back
        ---- Destroy timer if max ticks is reached
   if autoAttachTimerTickMax > 0 and autoAttachTimerTicks >= autoAttachTimerTickMax then
      timer.destroy()
   end
        ---- Check if process is running
   if getProcessIDFromProcessName(PROCESS_NAME) ~= nil then
      timer.destroy() ---- Destroy timer
      openProcess(PROCESS_NAME) ---- Open the process


        debugProcess(2)  -- Attach Debugger to the process.


        debug_setBreakpoint('XXX.exe+29F54')

        ---pause()



   end
   autoAttachTimerTicks = autoAttachTimerTicks + 1 ---- Increase ticks
end
autoAttachTimer = createTimer(getMainForm()) ---- Create timer with the main form as it's parent
autoAttachTimer.Interval = autoAttachTimerInterval ---- Set timer interval
autoAttachTimer.OnTimer = autoAttachTimer_tick ---- Set timer tick call back
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ParkourPenguin
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Joined: 06 Jul 2014
Posts: 4289
PostPosted: Sat Nov 26, 2022 1:09 pm    Post subject: Reply with quote
If you're trying to find the tiny exe process and set a breakpoint on the entry point before it starts running, that's not going to happen. Even a single millisecond is a ridiculously long time for a CPU. It would be like trying to catch a bullet with a pair of chopsticks- it's not possible.

Use Lua to start the process yourself. celua.txt:
Quote:
createProcess(path, parameters OPTIONAL, debug OPTIONAL, breakonentrypoint OPTIONAL) : Creates a process. If debug is true it will be created using the windows debugger and if breakonentry is true it will cause a breakpoint to occur on entrypoint

If the other app needs to execute the tiny exe, I don't know any easy way for CE to break on entry. You could hook the call that creates the process and do something there. {$ccode} will be helpful.
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reverser69
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PostPosted: Sat Nov 26, 2022 11:04 pm    Post subject: Reply with quote
ParkourPenguin wrote:


If the other app needs to execute the tiny exe, I don't know any easy way for CE to break on entry. You could hook the call that creates the process and do something there. {$ccode} will be helpful.


it is possible with gflags or windbg global flags.
i am doing what i want with x64dbg and IDA, both break at the entry.
but because CE's flexibility+LUA, i want to do it with CE too.

i dont know if Darkbyte will add this capability of gflag compatibility to CE or not. i coudnt make it work so far.

ill try hooking until some good news come from this forum.
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