reversehard

Aros-25

kalmarctf

Task: stripped 32-bit ARM ELF behind a raw TCP service, exposing a small custom VM and a hidden file oracle. Solution: recover the VM opcodes and syscalls, read flag.txt into mapped memory, then use the buggy exit printer as a byte-by-byte leak primitive.

$ ls tags/ techniques/
elforaclecustom_vmstatic_binaryarmstripped_binaryqemu_armtcp_service
vm_reconstructionsyscall_recoveryoracle_exfiltrationbytewise_leak
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