Write Up FIRST Challenge 2020

Break the Snake — Reverse Engineering

My Secret Part 1–5 — Reverse Engineering

f=open("mysecret","r")
a=f.read()[::-1]
print a
b main
x/25000i $pc
b *0x55555557731e
Part 1 : 095bf40d794b0259556648e114366f46108ab32b324ac9d30399e8e270d47ef5Part 2 : I forgot my very old key
Part 3 : 2d383d1c373a15831e94
Part 4 : RC4
Part 5 : 10107

PLC Firmware Injection — ICS

SPI Configuration
S0190000506f7765725043204669726d776172652053747562002B
S12304CC9421FFD093E1002C7C3F0B78907F000C3920012C913F0018815F000C813F000C69
S12304EC7D4A49D6813F00187D2A4BD6913F001C813F001C5529083C913F001C813F001C14
S117050C7D234B78397F003083EBFFFC7D615B784E80002084
S5030003F9
r31_0xc=r3
r9=0x12c
r31_0x18=r9
r10=r31_0xc
r9=r31_0xc
r10=r10*r9
r9=r31_0x18
r9=r10/r9
r31_0x1c=r9
r9=r31_0x1c
r9 = r9 << 1
r31_0x1c=r9

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kosong

kosong

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CTF Player | Currently learning about Reverse Engineering and Cryptography