The company has 47,200 employees in its various operations in a number of countries and had €6.9 billion in revenue last year.
The people behind the attack have released a fourth batch of data stolen from the company during the incident.
Some sections of the SPIE website appear to be down, but whether this is due to the ransomware attack or not cannot be determined.
A screenshot of the Nefilim site on the dark web.
This year, Nefilim has been used in attacks on eyewear provider Luxottica, white goods manufacturer Fisher & Paykel, transport and logistics provider Toll Group and German services provider Dussmann Group.
Indian pharmaceutical products manufacturer Indoco Remedies and a subsidiary of France's Orange SA, a telecommunications provider, have also come under attack by malicious individuals using this ransomware.