Keep file when demux adds default platform (#2653)

If demux_sample returns (path, "windows") for a plain file (e.g. a csv named SAMPLE.XLS), tuple-based check saw (path, "") ≠ (path, "windows") and deleted the upload, triggering “Extracted file doesn’t exist”. Compare paths only.

Author: itamarga

lib/cuckoo/core/database.py

@@ -1543,7 +1543,7 @@ def demux_sample_and_add_to_db(
         # extract files from the (potential) archive
         extracted_files, demux_error_msgs = demux_sample(file_path, package, options, platform=platform)
         # check if len is 1 and the same file, if diff register file, and set parent
-        if extracted_files and (file_path, platform) not in extracted_files:
+        if extracted_files and not any(file_path == path for path, _ in extracted_files):
             sample_parent_id = self.register_sample(File(file_path), source_url=source_url)
             if conf.cuckoo.delete_archive:
                 path_delete(file_path.decode())