# Reverse (Shuvsec)

## Corruptbattle

UPX packed binary. Go lang.
$upx -d corruptbattle
len(hash) = 42
going thorugh the source code i got
three values
0xE209470e1289
D4CE5F23aa7e48
6228c46C4D99a4

Wildly guessing nothing else , got lucky haha

## HashMe

Used angr (framework for reversing in python), passed the binary as first argument , takes atleast 5 min to give the flag.

import angr
import claripy
import sys

def main(argv):
b = argv[1]
project = angr.Project(b)
length = 23
characters = [claripy.BVS('flag{-%d' %i, 8) for i in range(length)]
input_ = claripy.Concat(*characters + [claripy.BVV(b'\n')])

state = project.factory.full_init_state(args=["b"], stdin=input_)

simulate = project.factory.simulation_manager(state)
good_addr = 0x15fc
bad_addr = 0x1610
simulate.explore(find=good_addr, avoid=bad_addr)

s = []
for j in simulate.deadended:
if b"Here you go awaaaaay" in j.posix.dumps(1):
s.append(j)

valid = s[0].posix.dumps(0)
print(valid)

if __name__ == '__main__':
main(sys.argv)

vulncon{r3ver5eM4s7er}