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Topic created on: April 21, 2011 14:35 CDT by Ahile .

Hi ,

I tried to disassemble a PE executable code which has a TLS callback function with IDA pro + stealth plug in and it doesn't work . When I run the application in the IDA Pro , I have a message :" A debugger was find ...." .
Can somebody give me some tricks

Thanks ,
Cxx

cseagle		April 22, 2011 02:11.03 CDT
Have you tried setting a breakpoint on the tls callback? There is an issue with "stop on debugger start" when a binary has a tls callback, you can work around it by setting a breakpoint on the tls callback, then IDAStealth should work once you continue the process.

Ahile		April 22, 2011 11:46.31 CDT
Yes , I put a breakpoint in the tls callback , I enabled the IDAStealth plug in . If I trace with F8 or F7 then I didn't leave the tls function .It's like a infinite loop . If I add another breakpoint in the start entry point and I start the simulation, I reach the first breakpoint in the tls callback and then I receive the message " You have a debug tool in your system" . I didn't reach the start entry point because the application see the IDA debug. This application has a anti-debug mechanism because when the application is loaded on the RAM it check if I put the usb dongle in the port . So , is it another solution ? Thanks, Cxx > cseagle: Have you tried setting a breakpoint on the tls callback? There is an issue with \"stop on debugger start\" when a binary has a tls callback, you can work around it by setting a breakpoint on the tls callback, then IDAStealth should work once you continue the process. > cseagle: Have you tried setting a breakpoint on the tls callback? There is an issue with \"stop on debugger start\" when a binary has a tls callback, you can work around it by setting a breakpoint on the tls callback, then IDAStealth should work once you continue the process.

cseagle		April 22, 2011 20:18.58 CDT
A few possibilities. 1) are you sure that IDA stealth is active? Did you copy both idastealh.plw and hidedebugger.dll into ida's plugin directory? 2) perhaps the binary contains a debugger detection technique that idastealth is not hiding from. 3) If all the tls callback does is debugger detection, can you nop it out?

memger		April 25, 2011 08:26.15 CDT
Could you please send me your application along with the steps to reproduce it on my computer? If this is a bug I'll try to fix it asap. Thx

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