reversemedium

Only Give Me Flag

hackerlab

Task: a PE32+ Windows GUI crackme validates both a passphrase and a strictly formatted CODEBY flag made of four hex groups. Solution: recover the AES-CBC passphrase from embedded key material, reconstruct the flag constraints, invert the long arithmetic loop, and verify the recovered flag offline.

$ ls tags/ techniques/
aes_cbcwindows_pex64flag_checkerpe32_plusgui_checkerwcstoulhex_flag_format
static_reverse_engineeringaes_cbc_decryptionformat_constraint_recoveryloop_inversion
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