IEC TR 62351-90-3:2021

IEC TR 62351-90-3 ®
Edition 1.0 2021-03
TECHNICAL
REPORT
colour
inside
Power systems management and associated information exchange – Data and
communications security –
Part 90-3: Guidelines for network and system management

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IEC TR 62351-90-3 ®
Edition 1.0 2021-03
TECHNICAL
REPORT
colour
inside
Power systems management and associated information exchange – Data and

communications security –
Part 90-3: Guidelines for network and system management

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.200 ISBN 978-2-8322-9529-8

– 2 – IEC TR 62351-90-3:2021 © IEC 2021
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Abbreviated terms and acronyms . 6
5 Information collection, filtering and processing . 7
5.1 IT/OT elements . 7
5.2 Network and system monitoring tools . 8
5.2.1 SNMP monitoring agents . 8
5.2.2 IDS/IPS probes . 8
5.2.3 Network and system management central platforms . 9
5.3 Log management tools . 10
5.3.1 Log collection architecture . 10
5.3.2 Log agents . 11
5.3.3 Log normalization . 12
5.3.4 Security Information and Event Management (SIEM) . 12
5.4 Other relevant data sources . 12
6 Information correlation and presentation . 13
6.1 Information selection and collection profiles . 13
6.1.1 General . 13
6.1.2 NSM and 62351-7 . 13
6.1.3 NSM and 61850-specific monitoring . 16
6.1.4 NSM with other SNMP objects . 16
6.1.5 Logs . 17
6.2 Events, incidents and correlations . 18
6.3 Security metrics (KPI) . 18
6.4 Risk Management platforms . 19
7 Monitoring use cases . 19
7.1 General . 19
7.2 Substation . 19
7.3 DER systems . 20
7.4 Large Hydro . 20
7.5 Generation . 20
8 Monitoring profiles for attack scenarios . 20
8.1 General . 20
8.2 Scenario: Malicious IED program change . 20
8.3 Scenario: Unexpected 61850 Configuration . 21
8.4 Scenario: Information gathering malware . 21
Bibliography . 22

Figure 1 – NSM/Cybersecurity overall architecture . 9
Figure 2 – A logging infrastructure . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATIONS SECURITY –

Part 90-3: Guidelines for network and system management

FOREWORD
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IEC TR 62351-90-3 has been prepared by IEC technical committee 57: Power systems
management and associated information exchange. It is a Technical Report.
The text of this Technical Report is based on the following documents:
DTR Report on voting
57/2255/DTR 57/2337/RVDTR
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Report is English.

– 4 – IEC TR 62351-90-3:2021 © IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts of the IEC 62351 series, under the general title: Power systems management
and associated information exchange – Data and communications security, can be found on the
IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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POWER SYSTEMS MANAGEMENT AND ASSOCIATED INFORMATION
EXCHANGE – DATA AND COMMUNICATIONS SECURITY –

Part 90-3: Guidelines for network and system management

1 Scope
This part of IEC 62351, which is a technical report, provides guidelines for efficiently handling
both IT and OT data in terms of their monitoring, classification and correlations on them to
deduce any possible useful outcomes about the state of the power system.
The convergence of information technologies (IT) and operational technologies (OT) refers to
the integration of the systems, processes and data associated with the domains of IT and OT.
This document provides guidelines for a comprehensive security monitoring for power grid
components based on IT/OT convergent systems. The emphasis is about the development of a
methodology and a set of recommendations for utility operators to build a general monitoring
framework based on the analysis of the data collected from different IT and OT systems through
network management, traffic inspection, and system activity readings. As such, the monitoring
framework that this document introduces relies on the integration of management and logging
information obtained using IEC 62351-7 an
...