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usm01

Need Help to fix crashing

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usm01

hi, it may seem silly but how does the soft crashes if only a specific txt is changed in specific location within an exe.


The exe does not crashes if txt is changed in any other location.


target :  http://www.aquariussoft.com/downloads/bepunctualgroup.exe 


              (size: 3.36MB)


 


 


original txt: http://tau.rghost.ru/private/53094036/ebb3b2f6e1cf0eb2c786869798ea20e7/image.png


modified txt: http://tau.rghost.ru/private/53093712/9005d269ceb4ceabd0fcbe9bd49fc4bf/image.png


err msg :      http://higgs.rghost.ru/private/53093710/dc6f6aead515c2eb19e9f8d87ff40d6d/image.png


 


the error msg is generated if asres.dll is present in (C:\Program Files\Aquarius Soft\BePunctual GPS) location, otherwise error msg does not popup.


 


modified exe link : http://rghost.net/download/private/53093664/9f1de449da994ed0f044696b70f11511/51357c586ad27532c22ec250845ec5a1813c6aa8/GroupPunchStation.zip


 


Any help would be greatly appreciated.


Regards.


Edited by usm01

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usm01

Nieo, Your cracked version does not generate error if the string is changed


but this other addon for the software does.


 


just wondering how does the exe performs such checks.


 


Regards.


Edited by usm01

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Nieo

Try 2 do in olly..


 


Method ur following obviously land vth error..


 


Its RSA routin i guess which protect license vth lot of encrypting n decrypting strings..


any wrong or null byte u land vth dis error..


 


 



Nieo, Your cracked version does not generate error if the string is changed


but this other addon for the software does.


 




Well m completely dis agree vth that..


 


Hw much I remember whn i try 2 chg any thing inside license routin evn me also get dis nasty error msg..


5nally aft spending few Hrs behind it i got d break though in complete reversing whole license Routin..


 


You didnt Ans my question Y u want 2 chg this string??..


i did not find any logic in doing that..


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usm01

Ans:


just for the sake of curiosity, that how a simple txt change can make exe crash


Also as i mentioned at the start of my post that it is a seem silly and has nothing to do with the actual use of software.


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Nieo

Ok..


 


Hw evr u said change in last version i cracked do not result in crash..


No i just check vth it give me crash..


After chng Run it 4 two or more time then chk it crash..


 


Its bcz of CRC checksum..

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Guest StudentofRE

i think if we do that in hex editor like hexworkshop.if we fill zero bytes in all characters that hold this text.exe wont crash.


Edited by StudentofRE

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CybotX

usm01,


 


define software crash?


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