File Signature
Also known as Magic Bytes/Header
Most files can also be recognized by a magic value in the file start/end.
Manipulating headers can lead to incorrect detection and maybe processing.
Some OS use the magic headers instead of the file extension.
Also known as File Signatures.
Some magic values:
Office Documents:
D0 CF 11 E0
ELF:
7F E L F
JPG:
FF D8
PNG:
89 P N G 0D 0A 1A 0A
Java class:
CA FE BA BE
Sometimes, magic headers are reused
PK.. (50 4B 03 04)
is the magic for ZIP files.
Actually, pptx are zip files.
Magic Headers can be manipulated if the content is known.
PyInstaller
allows the conversion of a Python application to an executable application.It packs the pyc files into a container. The container is extracted on runtime and compiled python code is executed.
Headers are omitted from pyc files. If a header is added, the extracted file executes as a standard pyc file.
Direct Visualization may help.
Direct byte visualization, Mapping to an image, Entropy Analysis, Tuples.
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