hacnho/keras-flatten-dataformat-trigger-poc

Keras Flatten Data Format Trigger MFV PoC

This repository contains a benign Huntr MFV proof of concept.

Files:

• control_flatten_data_format.keras - control Keras Native artifact with Flatten(data_format="channels_last").
• malicious_flatten_data_format.keras - malicious Keras Native artifact with Flatten(data_format="channels_first").
• reproduce.py - verifies the trigger-specific output flip and scanner output.

Run:

python3 -m venv /tmp/mfv-keras-flatten
. /tmp/mfv-keras-flatten/bin/activate
pip install -r requirements.txt
python reproduce.py

Expected result:

• Benign tensors keep classes [0, 1, 0] in both artifacts.
• The trigger tensor has a high value only at the position selected by the malicious flatten order; it is class 0 in the control artifact and class 1 in the malicious artifact.
• modelscan==0.8.8 reports No issues found!.