Machine Account Vulnerable NetLogon Connections (Part 1)

Vendor Documentation

https://support.microsoft.com/en-us/topic/how-to-manage-the-changes-in-netlogon-secure-channel-connections-associated-with-cve-2020-1472-f7e8cc17-0309-1d6a-304e-5ba73cd1a11e

Log Fields and Parsing

This section details the log fields available in this log message type, along with values parsed for both LogRhythm Default and LogRhythm Default v2.0 policies. A value of "N/A" (not applicable) means that there is no value parsed for a specified log field.

Log Field	LogRhythm Default	LogRhythm Default v2.0
Provider	N/A	<tag2>
EventID Qualifiers	<vmid>	<vmid>
Version	N/A	N/A
Level	<severity>	<severity>
Task	N/A	<vendorinfo>
Opcode	N/A	N/A
Keywords	N/A	<result>
TimeCreated	N/A	N/A
EventRecordID	N/A	N/A
Correlation	N/A	N/A
Execution	N/A	N/A
Channel	N/A	N/A
Computer	<dname>	<dname>
Security	N/A	N/A
Data	<login>	<sname>
Data	<domainorigin>	<domainorigin>
Data	<object>	N/A
Data	<vendorinfo>	N/A
Data	<objectname>	N/A
Data	<objecttype>	<object>

Log Processing Settings

This section details log processing changes made from the LogRhythm Default policy to LogRhythm Default v2.0. In some cases, base rules are broken down into sub-rules to appropriately parse log message types by their event types.

LogRhythm Default

Regex ID	Rule Name	Rule Type	Common Event	Classification
1011214	Machine Account Vulnerable NetLogon Connections	Base Rule	General Threat Message	Information
	EVID 5827: Vulnerable Netlogon Connection Denied	Sub Rule	Threat Blocked	Failed Activity
	EVID 5829: Vulnerable Netlogon Connection Allowed	Sub Rule	General Threat Message	Activity
	EVID 5830: Vuln. Netlogon Conn. Allow By Policy	Sub Rule	General Threat Message	Activity

LogRhythm Default v2.0

Regex ID	Rule Name	Rule Type	Common Event	Classification
1012727	V 2.0 : EVID 5827: NetLogon	Base Rule	Connection Denied	Warning