Detect port misuse by anomaly based detection ASIM Network Session schema
| Id | cbf07406-fa2a-48b0-82b8-efad58db14ec |
| Rulename | Detect port misuse by anomaly based detection (ASIM Network Session schema) |
| Description | This rule detects anomalous pattern in port usage. The rule utilize ASIM normalization, and is applied to any source which supports the ASIM Network Session schema. To tune the rule to your environment configure it using the ‘NetworkSession_Monitor_Configuration’ watchlist. This rule leverages log summaries generated by a Summary Rule or Summarized Playbook. If no such summaries are available, the rule falls back to direct analysis using ASIM function. |
| Severity | Medium |
| Tactics | CommandAndControl LateralMovement Execution InitialAccess |
| Techniques | T1095 T1059 T1203 T1190 |
| Required data connectors | AIVectraStream AWSS3 AzureFirewall AzureMonitor(VMInsights) AzureNSG CheckPoint CiscoASA CiscoAsaAma CiscoMeraki Corelight Fortinet MicrosoftSysmonForLinux MicrosoftThreatProtection PaloAltoNetworks SecurityEvents WindowsForwardedEvents WindowsSecurityEvents Zscaler |
| Kind | Scheduled |
| Query frequency | 1d |
| Query period | 14d |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/DetectPortMisuseByAnomalyBasedDetection.yaml |
| Version | 1.3.0 |
| Arm template | cbf07406-fa2a-48b0-82b8-efad58db14ec.json |
let lookback = 14d;
let mapping = _GetWatchlist('NetworkSession_Monitor_Configuration')
| where Type == "Detection" and ThresholdType == "Anomaly" and Severity != "Disabled"
| extend
Ports = split(Ports, ","),
App = split(App, ","),
Protocol = split(Protocol, ","),
Direction = split(Direction, ","),
Action = split(Action, ",")
| project
Ports,
App,
Protocol,
Direction,
Action,
Type,
ThresholdType,
Threshold,
Severity,
Tactic,
Name,
Description
| mv-expand Ports
| mv-expand App
| mv-expand Protocol
| mv-expand Direction
| mv-expand Action
| extend
Ports = tostring(Ports),
App = tostring(App),
Protocol = tostring(Protocol),
Direction = tostring(Direction),
Action = tostring(Action),
Threshold = toint(Threshold)
;
let AnomalyThreshold = 2.5;
let eps = materialize (_Im_NetworkSession
| project TimeGenerated
| where TimeGenerated > ago(5m)
| count
| extend Count = Count / 300);
let maxSummarizedTime = toscalar (
union isfuzzy=true
(
NetworkSummary_Protocol_CL
| where EventTime > ago(lookback)
| summarize max_TimeGenerated=max(EventTime)
| extend max_TimeGenerated = datetime_add('minute', 20, max_TimeGenerated)
),
(
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(lookback)
| summarize max_TimeGenerated=max(EventTime_t)
| extend max_TimeGenerated = datetime_add('minute', 20, max_TimeGenerated)
),
(
print(ago(lookback))
| project max_TimeGenerated = print_0
)
| summarize maxTimeGenerated = max(max_TimeGenerated)
);
let NetworkSummary_Protocol = materialize(
union isfuzzy=true
(
NetworkSummary_Protocol_CL
| where EventTime > ago(1d)
| project v = int(2)
),
(
print int(1)
| project v = print_0
)
| summarize maxv = max(v)
| extend
NetworkSummary_Protocol_Exists = (maxv > 1),
NetworkCustomAnalyticsExists = false
);
let NetworkCustomAnalytics = materialize(
union isfuzzy=true
(
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(1d)
| project v = int(2)
),
(
print int(1)
| project v = print_0
)
| summarize maxv = max(v)
| extend
NetworkCustomAnalyticsExists = (maxv > 1),
NetworkSummary_Protocol_Exists = false
);
let allData = union isfuzzy=true
(
(datatable(
exists: int,
NetworkSummary_Protocol_Exists: bool,
NetworkCustomAnalyticsExists: bool
)[
1, false, false
]
| where toscalar(eps) > 500
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
| join (NetworkCustomAnalytics) on NetworkCustomAnalyticsExists
)
| join (
_Im_NetworkSession(starttime=todatetime(ago(3d)), endtime=now())
| where TimeGenerated > maxSummarizedTime
| summarize Count=count()
by
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
bin(TimeGenerated, 10m)
| extend
EventTime = TimeGenerated,
Count = toint(Count),
DstPortNumber = toint(DstPortNumber),
exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
(datatable(
exists: int,
NetworkSummary_Protocol_Exists: bool,
NetworkCustomAnalyticsExists: bool
)[
1, false, false
]
| where toscalar(eps) <= 500
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
| join (NetworkCustomAnalytics) on NetworkCustomAnalyticsExists
)
| join (
_Im_NetworkSession(starttime=todatetime(ago(4d)), endtime=now())
| where TimeGenerated > maxSummarizedTime
| summarize Count=count()
by
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
bin(TimeGenerated, 10m)
| extend
EventTime = TimeGenerated,
Count = toint(Count),
DstPortNumber = toint(DstPortNumber),
exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
(datatable(exists: int, NetworkSummary_Protocol_Exists: bool)[1, false]
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
)
| join (
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(lookback)
| project
NetworkProtocol=NetworkProtocol_s,
DstPortNumber=DstPortNumber_d,
DstAppName=DstAppName_s,
NetworkDirection=NetworkDirection_s,
DvcAction=DvcAction_s,
Count=count__d,
EventTime=EventTime_t,
TimeGenerated,
Type
| extend Count = toint(Count), DstPortNumber = toint(DstPortNumber), exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
NetworkSummary_Protocol_CL
| where EventTime > ago(lookback)
| project
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
Count=count_,
EventTime,
TimeGenerated,
Type
| extend Count = toint(Count), DstPortNumber = toint(DstPortNumber)
)
| project-away exists*, maxv*, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
;
allData
| where isnotempty(DstPortNumber)
| make-series Total=sum(Count) on EventTime from ago(lookback) to now() step 1d by DstPortNumber, NetworkProtocol, NetworkDirection, DvcAction
| extend (anomalies, score, baseline) = series_decompose_anomalies(Total, AnomalyThreshold, -1, 'linefit')
| mv-expand anomalies, score, baseline, EventTime, Total
| extend
anomalies = toint(anomalies),
score = toint(score),
baseline = toint(baseline),
EventTime = todatetime(EventTime),
Total = tolong(Total)
| where EventTime >= ago(1d)
| extend DstPortNumber = tostring(DstPortNumber)
| where score >= 2 * AnomalyThreshold and baseline > 0
| join kind=inner ['mapping'] where Ports == DstPortNumber
| where (Protocol == "*" or Protocol has NetworkProtocol)
and (Direction == "*" or Direction has NetworkDirection)
and (Action == "*" or Action has DvcAction)
| project
Name,
Description,
NetworkProtocol,
DstPortNumber,
NetworkDirection,
DvcAction,
Severity,
Tactic
| summarize
NetworkProtocols=make_set_if(NetworkProtocol, isnotempty(NetworkProtocol), 20),
NetworkDirections=make_set_if(NetworkDirection, isnotempty(NetworkDirection), 5),
DvcActions=make_set_if(DvcAction, isnotempty(DvcAction), 10)
by Name, Severity, Tactic, DstPortNumber, Description
relevantTechniques:
- T1095
- T1059
- T1203
- T1190
triggerThreshold: 0
severity: Medium
name: Detect port misuse by anomaly based detection (ASIM Network Session schema)
status: Available
eventGroupingSettings:
aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Network Session Essentials/Analytic Rules/DetectPortMisuseByAnomalyBasedDetection.yaml
kind: Scheduled
query: |
let lookback = 14d;
let mapping = _GetWatchlist('NetworkSession_Monitor_Configuration')
| where Type == "Detection" and ThresholdType == "Anomaly" and Severity != "Disabled"
| extend
Ports = split(Ports, ","),
App = split(App, ","),
Protocol = split(Protocol, ","),
Direction = split(Direction, ","),
Action = split(Action, ",")
| project
Ports,
App,
Protocol,
Direction,
Action,
Type,
ThresholdType,
Threshold,
Severity,
Tactic,
Name,
Description
| mv-expand Ports
| mv-expand App
| mv-expand Protocol
| mv-expand Direction
| mv-expand Action
| extend
Ports = tostring(Ports),
App = tostring(App),
Protocol = tostring(Protocol),
Direction = tostring(Direction),
Action = tostring(Action),
Threshold = toint(Threshold)
;
let AnomalyThreshold = 2.5;
let eps = materialize (_Im_NetworkSession
| project TimeGenerated
| where TimeGenerated > ago(5m)
| count
| extend Count = Count / 300);
let maxSummarizedTime = toscalar (
union isfuzzy=true
(
NetworkSummary_Protocol_CL
| where EventTime > ago(lookback)
| summarize max_TimeGenerated=max(EventTime)
| extend max_TimeGenerated = datetime_add('minute', 20, max_TimeGenerated)
),
(
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(lookback)
| summarize max_TimeGenerated=max(EventTime_t)
| extend max_TimeGenerated = datetime_add('minute', 20, max_TimeGenerated)
),
(
print(ago(lookback))
| project max_TimeGenerated = print_0
)
| summarize maxTimeGenerated = max(max_TimeGenerated)
);
let NetworkSummary_Protocol = materialize(
union isfuzzy=true
(
NetworkSummary_Protocol_CL
| where EventTime > ago(1d)
| project v = int(2)
),
(
print int(1)
| project v = print_0
)
| summarize maxv = max(v)
| extend
NetworkSummary_Protocol_Exists = (maxv > 1),
NetworkCustomAnalyticsExists = false
);
let NetworkCustomAnalytics = materialize(
union isfuzzy=true
(
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(1d)
| project v = int(2)
),
(
print int(1)
| project v = print_0
)
| summarize maxv = max(v)
| extend
NetworkCustomAnalyticsExists = (maxv > 1),
NetworkSummary_Protocol_Exists = false
);
let allData = union isfuzzy=true
(
(datatable(
exists: int,
NetworkSummary_Protocol_Exists: bool,
NetworkCustomAnalyticsExists: bool
)[
1, false, false
]
| where toscalar(eps) > 500
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
| join (NetworkCustomAnalytics) on NetworkCustomAnalyticsExists
)
| join (
_Im_NetworkSession(starttime=todatetime(ago(3d)), endtime=now())
| where TimeGenerated > maxSummarizedTime
| summarize Count=count()
by
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
bin(TimeGenerated, 10m)
| extend
EventTime = TimeGenerated,
Count = toint(Count),
DstPortNumber = toint(DstPortNumber),
exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
(datatable(
exists: int,
NetworkSummary_Protocol_Exists: bool,
NetworkCustomAnalyticsExists: bool
)[
1, false, false
]
| where toscalar(eps) <= 500
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
| join (NetworkCustomAnalytics) on NetworkCustomAnalyticsExists
)
| join (
_Im_NetworkSession(starttime=todatetime(ago(4d)), endtime=now())
| where TimeGenerated > maxSummarizedTime
| summarize Count=count()
by
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
bin(TimeGenerated, 10m)
| extend
EventTime = TimeGenerated,
Count = toint(Count),
DstPortNumber = toint(DstPortNumber),
exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
(datatable(exists: int, NetworkSummary_Protocol_Exists: bool)[1, false]
| join (NetworkSummary_Protocol) on NetworkSummary_Protocol_Exists
)
| join (
NetworkCustomAnalytics_protocol_CL
| where EventTime_t > ago(lookback)
| project
NetworkProtocol=NetworkProtocol_s,
DstPortNumber=DstPortNumber_d,
DstAppName=DstAppName_s,
NetworkDirection=NetworkDirection_s,
DvcAction=DvcAction_s,
Count=count__d,
EventTime=EventTime_t,
TimeGenerated,
Type
| extend Count = toint(Count), DstPortNumber = toint(DstPortNumber), exists=int(1)
)
on exists
| project-away exists*, maxv, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
),
(
NetworkSummary_Protocol_CL
| where EventTime > ago(lookback)
| project
NetworkProtocol,
DstPortNumber,
DstAppName,
NetworkDirection,
DvcAction,
Count=count_,
EventTime,
TimeGenerated,
Type
| extend Count = toint(Count), DstPortNumber = toint(DstPortNumber)
)
| project-away exists*, maxv*, NetworkSummary_Protocol_Exists*, NetworkCustomAnalyticsExists*
;
allData
| where isnotempty(DstPortNumber)
| make-series Total=sum(Count) on EventTime from ago(lookback) to now() step 1d by DstPortNumber, NetworkProtocol, NetworkDirection, DvcAction
| extend (anomalies, score, baseline) = series_decompose_anomalies(Total, AnomalyThreshold, -1, 'linefit')
| mv-expand anomalies, score, baseline, EventTime, Total
| extend
anomalies = toint(anomalies),
score = toint(score),
baseline = toint(baseline),
EventTime = todatetime(EventTime),
Total = tolong(Total)
| where EventTime >= ago(1d)
| extend DstPortNumber = tostring(DstPortNumber)
| where score >= 2 * AnomalyThreshold and baseline > 0
| join kind=inner ['mapping'] where Ports == DstPortNumber
| where (Protocol == "*" or Protocol has NetworkProtocol)
and (Direction == "*" or Direction has NetworkDirection)
and (Action == "*" or Action has DvcAction)
| project
Name,
Description,
NetworkProtocol,
DstPortNumber,
NetworkDirection,
DvcAction,
Severity,
Tactic
| summarize
NetworkProtocols=make_set_if(NetworkProtocol, isnotempty(NetworkProtocol), 20),
NetworkDirections=make_set_if(NetworkDirection, isnotempty(NetworkDirection), 5),
DvcActions=make_set_if(DvcAction, isnotempty(DvcAction), 10)
by Name, Severity, Tactic, DstPortNumber, Description
tags:
- Schema: ASimNetworkSessions
SchemaVersion: 0.2.4
tactics:
- CommandAndControl
- LateralMovement
- Execution
- InitialAccess
id: cbf07406-fa2a-48b0-82b8-efad58db14ec
requiredDataConnectors:
- dataTypes:
- AWSVPCFlow
connectorId: AWSS3
- dataTypes:
- DeviceNetworkEvents
connectorId: MicrosoftThreatProtection
- dataTypes:
- SecurityEvent
connectorId: SecurityEvents
- dataTypes:
- SecurityEvent
connectorId: WindowsSecurityEvents
- dataTypes:
- WindowsEvent
connectorId: WindowsForwardedEvents
- dataTypes:
- CommonSecurityLog
connectorId: Zscaler
- dataTypes:
- Syslog
connectorId: MicrosoftSysmonForLinux
- dataTypes:
- CommonSecurityLog
connectorId: PaloAltoNetworks
- dataTypes:
- VMConnection
connectorId: AzureMonitor(VMInsights)
- dataTypes:
- AzureDiagnostics
connectorId: AzureFirewall
- dataTypes:
- AzureDiagnostics
connectorId: AzureNSG
- dataTypes:
- CommonSecurityLog
connectorId: CiscoASA
- dataTypes:
- CommonSecurityLog
connectorId: CiscoAsaAma
- dataTypes:
- Corelight_CL
connectorId: Corelight
- dataTypes:
- VectraStream
connectorId: AIVectraStream
- dataTypes:
- CommonSecurityLog
connectorId: CheckPoint
- dataTypes:
- CommonSecurityLog
connectorId: Fortinet
- dataTypes:
- Syslog
- CiscoMerakiNativePoller
connectorId: CiscoMeraki
version: 1.3.0
queryFrequency: 1d
triggerOperator: gt
description: |
'This rule detects anomalous pattern in port usage. The rule utilize [ASIM](https://aka.ms/AboutASIM) normalization, and is applied to any source which supports the ASIM Network Session schema. To tune the rule to your environment configure it using the 'NetworkSession_Monitor_Configuration' watchlist. This rule leverages log summaries generated by a Summary Rule or Summarized Playbook. If no such summaries are available, the rule falls back to direct analysis using ASIM function.'
queryPeriod: 14d
alertDetailsOverride:
alertTacticsColumnName: Tactic
alertDescriptionFormat: '{{Description}}'
alertSeverityColumnName: Severity
alertDisplayNameFormat: Detected {{Name}}
customDetails:
AllNetworkProtocols: NetworkProtocols
DstPortNumber: DstPortNumber
AllNetworkDirections: NetworkDirections
AllDvcAction: DvcActions