xorsearch

XORSearch is a program to search for a given string in an XOR, ROL, ROT or SHIFT encoded binary file. An XOR encoded binary file is a file where some (or all) bytes have been XORed with a constant value (the key). A ROL (or ROR) encoded file has its bytes rotated by a certain number of bits (the key). A ROT encoded file has its alphabetic characters (A-Z and a-z) rotated by a certain number of positions. A SHIFT encoded file has its bytes shifted left by a certain number of bits (the key): all bits of the first byte shift left, the MSB of the second byte becomes the LSB of the first byte, all bits of the second byte shift left, … XOR and ROL/ROR encoding is used by malware programmers to obfuscate strings like URLs.

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