LSO Mimecast Email - General Blocked Event

Vendor Documentation

https://integrations.mimecast.com/documentation/tutorials/understanding-siem-logs/

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
datetime	N/A	N/A
aCode	N/A	<vmid>
acc	N/A	N/A
MimecastIP	N/A	N/A
reason	<reason>	<reason>
fileName	N/A	<objectname>
Sender	<sender>	<sender>
SpamLimit	N/A	<quantity>
HLD	N/A	N/A
Delivered	N/A	<status>
URL	<url>	<url>
SHA256	N/A	<hash>
IP	N/A	<sip>
Source IP	<dip> <dname>	<snatip>
AttSize	N/A	<size>
UrlCategory	N/A	N/A
Receipient	<recipient>	<recipient>
Size	N/A	N/A
Act	N/A	<action> <tag1>
DIR	N/A	N/A
AttCnt	N/A	N/A
ScanResultInfo	N/A	N/A
MsgId	N/A	<object>
IPNewDomain	N/A	N/A
SenderDomain	<domainorigin>	<domainorigin>
Subject	N/A	<subject>
IPReplyMismatch	N/A	N/A
ReceiptAck	N/A	N/A
Definition	N/A	N/A
headerFrom	N/A	<login>
Hits	N/A	N/A
fileExt	N/A	<objecttype>
IPInternalName	N/A	N/A
Route	<status>	<policy>
Action	N/A	N/A
sha1	N/A	N/A
Rcpt	N/A	<recipient>
AttNames	N/A	N/A
Latency	N/A	<amount>
TaggedExternal	N/A	N/A
SpamInfo	N/A	N/A
MsgSize	N/A	N/A
TaggedMalicious	N/A	N/A
fileMime	N/A	N/A
TlsVer	N/A	<protname>
IPThreadDict	N/A	N/A
Virus	N/A	<threatname>
InternalName	N/A	N/A
md5	N/A	N/A
Cphr	N/A	N/A
IPSimilarDomain	N/A	N/A
Attempt	N/A	N/A
CustomName	N/A	N/A
SpamProcessingDetail	N/A	N/A
SenderDomainInternal	N/A	N/A
NewDomain	N/A	N/A
SpamScore	N/A	N/A
SimilarInternalDomain	N/A	N/A
Error	N/A	N/A
Snt	N/A	<bytesout>
CustomerIP	N/A	N/A
SimilarCustomExternalDomain	N/A	N/A
RejCode	N/A	<responsecode>
UseTls	N/A	N/A
SimilarMimecastExternalDomain	N/A	N/A
RejInfo	N/A	N/A
ReplyMismatch	N/A	N/A
RejType	N/A	<result> <tag2>
Err	N/A	N/A
ThreatDictionary	N/A	N/A
CustomThreatDictionary	N/A	N/A

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
1009437	General Blocked Event	Base Rule	Blocked Message	Failed Activity

LogRhythm Default v2.0

Regex ID	Rule Name	Rule Type	Common Event	Classification
1013288	V 2.0 : Email Logs	Base Rule	Email Handling Message	Information
	V 2.0 : Anti-Spoofing Lockout Messages	Sub Rule	Failed Spoofing Activity	Failed Attack
	V 2.0 : Connection Attempt Messages	Sub Rule	Connection Information	Information
	V 2.0 : Envelope Rejected Messages	Sub Rule	Couldn't Get Envelope Of Message In Inbox Folder	Error
	V 2.0 : Invalid Recipient Address Messages	Sub Rule	Blocked Message No Valid Recipients	Failed Activity
	V 2.0 : IP Found In RBL Messages	Sub Rule	Blocked Message RBL Match	Failed Activity
	V 2.0 : Manual Envelope Rejection Messages	Sub Rule	ReadFromMessage : Unable To Get Message Envelope	Error
	V 2.0 : Message Loop Detected Messages	Sub Rule	Infinite Loop Detected	Warning
	V 2.0 : Virus Signature Detection Messages	Sub Rule	Suspicious E-mail Activity	Suspicious
	V 2.0 : DMARC Sender Invalid Messages	Sub Rule	Blocked Message Sender Address Rejected	Failed Activity
	V 2.0 : Email Accepted	Sub Rule	Email Accepted	Information
	V 2.0 : Email Rejected	Sub Rule	Email Session Disposed - Reject	Information