Is this a Denial of Service (DOS) attack on the Internet Information Services (IIS) Web Server?

[Turritopsis Dohrnii Teo En Ming <turritopsis.dohrnii () teo-en-ming com>]

Good evening from Singapore,

The IT company I am working in has a customer/client in the shipping industry.

They are running Windows Server with Internet Information Services 6.0 web server.

Since 13 October 2018, their IIS web server logs have grown extremely huge (465 Gigabytes to-date) and completely 
filled up the entire C:\ drive, leaving it without any free space. Nobody can access any web application now.

Is this characteristic or symptom of a Denial of Service (DOS) attack? 

Should I advise the client to turn on Intrusion Prevention System (IPS) and Flood Protection and enable Geo-IP Filter 
and Botnet Filter at the firewall/network security appliance level to mitigate DOS attacks?

Please advise. Thank you very much.

1st November 2018 Thursday 6:25 PM Singapore Time GMT+8
     
 
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