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CSAW. Red Team competition. «Babyrev»

Babyrev is reversing challenge on CSAW «Red team competition» where have to pass 99 rounds of input 4-digits code based on some check function.  Main graph on IDA:  Disassembly of check(): Dump of assembler code for function check: 0x0000000000400893 <+0>: push rbp 0x0000000000400894 <+1>: mov rbp,rsp 0x0000000000400897 <+4>: mov QWORD