LockBit

Inspired by obfuscation techniques used in the LockBit ransomware family, this challenge implements a multi-layer encryption routine to hide its secrets.

You are provided with a compiled Linux binary that prompts for a decryption key. The encrypted data is split into two parts. Analyze the binary to understand the transformation operations and recover the flag.

Binary Information:

Filename: lockbit
Size:     14,680 bytes (15 KB)
MD5:      071767764bd41ba5a5ef383fa9d1d42c
SHA1:     e4709121a5033e3ac3ac1e739a3ace498f45bf5b
SHA256:   01b83079d3794a93792ecf6fb9c1f208c31e1a3c2da137c563b098ba02937ec2

Verify integrity after download:

md5sum lockbit
sha1sum lockbit
sha256sum lockbit