MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 53242559-95ea-4d4c-b003-107e8f06304b
name: Cisco SEG - Possible outbreak
description: |
'Detects possible outbreak activity.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: CefAma
dataTypes:
- CommonSecurityLog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1566
query: |
CiscoSEGEvent
| where NetworkDirection =~ 'Incoming'
| where tostring(AdditionalFields) has 'ESAOFVerdict'
| extend of_verdict = extract(@'ESAOFVerdict":"(NOT_EVALUATED|POSITIVE|NEGATIVE)"', 1, tostring(AdditionalFields))
| where of_verdict =~ 'POSITIVE'
| extend AccountCustomEntity = DstUserName
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
version: 1.0.3
kind: Scheduled
Stages and Predicates
Stage 1: source
CiscoSEGEvent
Stage 2: where
| where NetworkDirection =~ 'Incoming'
Stage 3: where
| where tostring(AdditionalFields) has 'ESAOFVerdict'
Stage 4: extend
| extend of_verdict = extract(@'ESAOFVerdict":"(NOT_EVALUATED|POSITIVE|NEGATIVE)"', 1, tostring(AdditionalFields))
Stage 5: where
| where of_verdict =~ 'POSITIVE'
Stage 6: extend
| extend AccountCustomEntity = DstUserName
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
AdditionalFields | match |
| field:"AdditionalFields" kind:match value:"ESAOFVerdict" |
NetworkDirection | eq |
| field:"NetworkDirection" kind:eq value:"Incoming" |
of_verdict | eq |
| field:"of_verdict" kind:eq value:"POSITIVE" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
of_verdict | extend |
AccountCustomEntity | extend |