Reverse engineer challenge3.exe on the target mach...
Tạo vào: 26 tháng 8, 2026
Trả lời bằng GPT-5.6 Thinking bởi Chat01
Câu hỏi
challenge3.exe
Reverse engineer challenge3.exe on the target machine with the IP address 172.25.65.103 and identify the standard algorithm implemented by the membership validation function.(Answer Format: Xxxx Xxxxxxxxx) also Analyze the fiile challenge3.exe and determine the hexadecimal value used as the divisor in its final checksum validation on the machine with the IP address 172.25.65.103.(Answer Format: NxNX)
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Trả lời
Results from static reverse engineering of the uploaded challenge3.exe:
- Membership validation algorithm:
Luhn Algorithm - Final checksum divisor:
0x0A
Evidence: the validator doubles alternating digits, subtracts 9 when the doubled value exceeds 9, accumulates the digits, then checks whether the total modulo 10 is zero. The compiler implements % 10 using the multiplication constant 0x66666667 rather than an explicit div instruction.