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vos 30

vos
30
Check Summer
Author: Vlad Roskov (mrvos)

Is it summer? Let's check...

OK, I took this app (check_summer.exe) that calculates checksums and fed some data into it, including flag:

So now you only have CRC32 of the flag, good luck recovering it from eight hexes, HAHA!!





(wait, wait, what are you doing?

aaaagh where are you dragging me)





OK, Vlad doesn't know that, but we inserted a hardware implant into his CPU to record every instruction executed.

Here is the trace corresponding to the events shown in the video above: check_summer_rtrace.txt

Please use your technical skills to recover the data being checksummed. We really need that flag.

Flag:


30 30 30 30 30 30 30 30 30 30 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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