[MISP & ImportFileMISP] Obervable missing from import

[Lhorus6]

Description

When importing the MISP attributes “filename|sha256”, OpenCTI imports the filename as a File Observable and an Indicator, but the sha256 is missing.

Looking at the code, the connector seems to support it, so we have a bug there

Environment

OCTI 6.4.6

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. Enable a MISP connector
2. Create a "filename|sha256" attribute in MISP
3. Wait for OpenCTI ingesting it
   -> No sha256

Other Option

1. Enbale ImportFileMISP
2. Ingest the following file (it's an export of a MISP event containing a "filename|sha256" attribute)

misp.event.350.json