Netskope - Repeated or Critical Policy Violations

Status: available
Severity: high
Time window: 1h
Group by: CsUsername, XCCountry, XCDevice
Source: github.com/Azure/Azure-Sentinel

Detects users with repeated policy violations or critical policy blocks. Monitors policy enforcement effectiveness and compliance.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Impairment	`T1685` Disable or Modify Tools
Exfiltration	`T1048` Exfiltration Over Alternative Protocol

Rule body

id: dacab67e-fcf3-41c6-a191-579c7be1814d
name: Netskope - Repeated or Critical Policy Violations
description: |
  Detects users with repeated policy violations or critical policy blocks. Monitors policy enforcement effectiveness and compliance.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: NetskopeWebTxConnector
    dataTypes:
      - NetskopeWebTransactions_CL
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
  - DefenseEvasion
  - Exfiltration
relevantTechniques:
  - T1562
  - T1048
query: |
  let violationThreshold = 5;
  NetskopeWebTransactions_CL
  | where TimeGenerated > ago(1h)
  | where isnotempty(CsUsername)
  | where isnotempty(XPolicyAction) and isnotempty(XPolicyName)
  | where XPolicyAction =~ 'block' or XPolicyAction =~ 'alert'
  | summarize 
      ViolationCount = count(),
      Policies = make_set(XPolicyName),
      PolicyActions = make_set(XPolicyAction),
      Apps = make_set(XCsApp),
      Hosts = make_set(CsHost),
      Activities = make_set(XCsAppActivity),
      BlockCount = countif(XPolicyAction =~ 'block'),
      AlertCount = countif(XPolicyAction =~ 'alert'),
      FirstViolation = min(TimeGenerated),
      LastViolation = max(TimeGenerated)
      by CsUsername, XCCountry, XCDevice
  | where ViolationCount >= violationThreshold or BlockCount > 0
  | extend ViolationSeverity = case(
      BlockCount > 10, 'Critical',
      BlockCount > 5, 'High',
      ViolationCount > 20, 'High',
      ViolationCount > 10, 'Medium',
      'Low')
  | project 
      TimeGenerated = LastViolation,
      User = CsUsername,
      TotalViolations = ViolationCount,
      BlockedAttempts = BlockCount,
      AlertedActions = AlertCount,
      ViolatedPolicies = Policies,
      PolicyActions,
      ApplicationsInvolved = Apps,
      TargetHosts = Hosts,
      Activities,
      Country = XCCountry,
      Device = XCDevice,
      ViolationSeverity,
      FirstOccurrence = FirstViolation,
      LastOccurrence = LastViolation
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: User
version: 1.0.0
kind: Scheduled

Stages and Predicates

Parameters

let violationThreshold = 5;

Stage 1: `source`

NetskopeWebTransactions_CL

Stage 2: `where`

| where TimeGenerated > ago(1h)

Stage 3: `where`

| where isnotempty(CsUsername)

Stage 4: `where`

| where isnotempty(XPolicyAction) and isnotempty(XPolicyName)

Stage 5: `where`

| where XPolicyAction =~ 'block' or XPolicyAction =~ 'alert'

Stage 6: `summarize`

| summarize 
    ViolationCount = count(),
    Policies = make_set(XPolicyName),
    PolicyActions = make_set(XPolicyAction),
    Apps = make_set(XCsApp),
    Hosts = make_set(CsHost),
    Activities = make_set(XCsAppActivity),
    BlockCount = countif(XPolicyAction =~ 'block'),
    AlertCount = countif(XPolicyAction =~ 'alert'),
    FirstViolation = min(TimeGenerated),
    LastViolation = max(TimeGenerated)
    by CsUsername, XCCountry, XCDevice

Stage 7: `where`

| where ViolationCount >= violationThreshold or BlockCount > 0

Stage 8: `extend`

| extend ViolationSeverity = case(
    BlockCount > 10, 'Critical',
    BlockCount > 5, 'High',
    ViolationCount > 20, 'High',
    ViolationCount > 10, 'Medium',
    'Low')

ViolationSeverity =

ifBlockCount > 10'Critical'

elifBlockCount > 5'High'

elifViolationCount > 20'High'

elifViolationCount > 10'Medium'

else'Low'

Stage 9: `project`

| project 
    TimeGenerated = LastViolation,
    User = CsUsername,
    TotalViolations = ViolationCount,
    BlockedAttempts = BlockCount,
    AlertedActions = AlertCount,
    ViolatedPolicies = Policies,
    PolicyActions,
    ApplicationsInvolved = Apps,
    TargetHosts = Hosts,
    Activities,
    Country = XCCountry,
    Device = XCDevice,
    ViolationSeverity,
    FirstOccurrence = FirstViolation,
    LastOccurrence = LastViolation

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`BlockCount`	gt	`0`	`field:"BlockCount" kind:gt value:"0"`
`CsUsername`	is_not_null	(no value, null check)	`field:"CsUsername" kind:is_not_null`
`ViolationCount`	ge	`5`	`field:"ViolationCount" kind:ge value:"5"`
`XPolicyAction`	eq	`alert` `block`	`field:"XPolicyAction" kind:eq`
`XPolicyAction`	is_not_null	(no value, null check)	`field:"XPolicyAction" kind:is_not_null`
`XPolicyName`	is_not_null	(no value, null check)	`field:"XPolicyName" kind:is_not_null`

Output fields

These fields are emitted when the rule matches.

Field	Source
`Activities`	`project`
`AlertedActions`	`project`
`ApplicationsInvolved`	`project`
`BlockedAttempts`	`project`
`Country`	`project`
`Device`	`project`
`FirstOccurrence`	`project`
`LastOccurrence`	`project`
`PolicyActions`	`project`
`TargetHosts`	`project`
`TimeGenerated`	`project`
`TotalViolations`	`project`
`User`	`project`
`ViolatedPolicies`	`project`
`ViolationSeverity`	`project`

Netskope - Repeated or Critical Policy Violations

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: where

Stage 6: summarize

Stage 7: where

Stage 8: extend

Stage 9: project