2fa.fbrip [better] Jun 2026

Let’s decode the title:

Why? SIM swaps, SS7 exploits, carrier support scams. Use only when nothing else is available.

| Index | Table entry (hex) | |-------|-------------------| | 0 | 0xa15b3c9d6e1f2a4b | | 1 | 0x075c2d3e8fa0b1c2 | | 2 | 0xd3e4f5061728394a | | 3 | 0x5b6c7d8e9fa0b1c2 | | 4 | 0xd3e4f5061728394a | | 5 | 0x5b6c7d8e9fa0b1c2 | | | 0xdeadbeefcafebabe | 2fa.fbrip

You enter this secret key into a 2FA generator.

Thus the only way the check can succeed is if the is such that after the loop the value read ( mov rax, [rdx] ) is already equal to the magic constant. The value read is not derived from the table; it is a separate constant. Consequently the loop does not affect that constant at all. The whole XOR loop is a red herring – the function will always return success if the loop finishes . Let’s decode the title: Why

Dump the data at the referenced address (e.g., with objdump -s or by examining the binary in Ghidra).

TABLE = [ 0xa15b3c9d6e1f2a4b, 0x075c2d3e8fa0b1c2, 0xd3e4f5061728394a, 0x5b6c7d8e9fa0b1c2, 0xd3e4f5061728394a, 0x5b6c7d8e9fa0b1c2, ] | Index | Table entry (hex) | |-------|-------------------|

The challenge is called and the attached file is named fbrip . It is a small binary (Linux ELF, 64‑bit) that pretends to be a “Facebook‑style” login with a second‑factor code. The goal is to obtain the flag that the program prints after a successful login.

In the .rodata section we find:

For performance marketers and agencies, represents a standard for high-quality, resilient social media assets. By combining the security of two-factor authentication with the established history of "ripped" accounts, professionals can maintain a stable infrastructure for their advertising and engagement efforts.

; success path mov eax, 1 leave ret