CYFIRMA - High severity File Hash Indicators with Block Action Rule

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Id	7cb829b2-915a-42c2-adb9-725e9ce9bf43
Rulename	CYFIRMA - High severity File Hash Indicators with Block Action Rule
Description	“This query retrieves file hash indicators marked for blocking, with no assigned role, from the CyfirmaIndicators_CL table. It extracts MD5, SHA1, and SHA256 hashes and includes threat metadata for use in preventive security controls such as EDRs, threat intel platforms, or automated blocklists.”
Severity	High
Tactics	Execution InitialAccess DefenseEvasion Impact
Techniques	T1204 T1566 T1027 T1486 T1566.001
Required data connectors	CyfirmaCyberIntelligenceDC
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	GreaterThan
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/FileHashIndicatorsBlockHighSeverityRule.yaml
Version	1.0.1
Arm template	7cb829b2-915a-42c2-adb9-725e9ce9bf43.json

KQL

// File Hash Indicators with Block Action
let timeFrame = 5m;
CyfirmaIndicators_CL 
| where ConfidenceScore >= 80
    and TimeGenerated between (ago(timeFrame) .. now())
    and pattern contains 'file:hashes' and RecommendedActions has 'Block' and (isempty(Roles) or not(Roles has_any ('Malware', 'Trojan')))
| extend MD5 = extract(@"file:hashes\.md5\s*=\s*'([a-fA-F0-9]{32})'", 1, pattern)
| extend SHA1 = extract(@"file:hashes\.'SHA-1'\s*=\s*'([a-fA-F0-9]{40})'", 1, pattern)
| extend SHA256 = extract(@"file:hashes\.'SHA-256'\s*=\s*'([a-fA-F0-9]{64})'", 1, pattern)
| extend
    Algo_MD5='MD5',
    Algo_SHA1= 'SHA1',
    Algo_SHA256='SHA256',
    ProviderName = 'CYFIRMA',
    ProductName = 'DeCYFIR/DeTCT'
| project  
    MD5,
    SHA1,
    SHA256,
    Algo_MD5,
    Algo_SHA1,
    Algo_SHA256,
    ThreatActors,
    Sources,
    RecommendedActions,
    Roles,
    Country,
    name,
    Description,
    ConfidenceScore,
    SecurityVendors,
    IndicatorID,
    created,
    modified,
    valid_from,
    Tags,
    ThreatType,
    TimeGenerated,
    ProductName,
    ProviderName

YAML

id: 7cb829b2-915a-42c2-adb9-725e9ce9bf43
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence File Hash Indicators with Block Action - {{name}} '
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDescriptionFormat: '{{Description}} - {{name}} '
customDetails:
  RecommendedActions: RecommendedActions
  TimeGenerated: TimeGenerated
  Description: Description
  Tags: Tags
  Sources: Sources
  Roles: Roles
  IndicatorID: IndicatorID
  Modified: modified
  ThreatActors: ThreatActors
  ThreatType: ThreatType
  SecurityVendors: SecurityVendors
  ConfidenceScore: ConfidenceScore
  Country: Country
  ValidFrom: valid_from
  Created: created
triggerThreshold: 0
description: |
  "This query retrieves file hash indicators marked for blocking, with no assigned role, from the CyfirmaIndicators_CL table. 
  It extracts MD5, SHA1, and SHA256 hashes and includes threat metadata for use in preventive security controls such as EDRs, threat intel platforms, or automated blocklists."  
suppressionDuration: 5m
enabled: false
requiredDataConnectors:
- connectorId: CyfirmaCyberIntelligenceDC
  dataTypes:
  - CyfirmaIndicators_CL
queryPeriod: 5m
version: 1.0.1
severity: High
tactics:
- Execution
- InitialAccess
- DefenseEvasion
- Impact
queryFrequency: 5m
kind: Scheduled
eventGroupingSettings:
  aggregationKind: AlertPerResult
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: false
entityMappings:
- entityType: FileHash
  fieldMappings:
  - columnName: Algo_MD5
    identifier: Algorithm
  - columnName: MD5
    identifier: Value
- entityType: FileHash
  fieldMappings:
  - columnName: Algo_SHA1
    identifier: Algorithm
  - columnName: SHA1
    identifier: Value
- entityType: FileHash
  fieldMappings:
  - columnName: Algo_SHA256
    identifier: Algorithm
  - columnName: SHA256
    identifier: Value
name: CYFIRMA - High severity File Hash Indicators with Block Action Rule
relevantTechniques:
- T1204
- T1566
- T1027
- T1486
- T1566.001
triggerOperator: GreaterThan
query: |
  // File Hash Indicators with Block Action
  let timeFrame = 5m;
  CyfirmaIndicators_CL 
  | where ConfidenceScore >= 80
      and TimeGenerated between (ago(timeFrame) .. now())
      and pattern contains 'file:hashes' and RecommendedActions has 'Block' and (isempty(Roles) or not(Roles has_any ('Malware', 'Trojan')))
  | extend MD5 = extract(@"file:hashes\.md5\s*=\s*'([a-fA-F0-9]{32})'", 1, pattern)
  | extend SHA1 = extract(@"file:hashes\.'SHA-1'\s*=\s*'([a-fA-F0-9]{40})'", 1, pattern)
  | extend SHA256 = extract(@"file:hashes\.'SHA-256'\s*=\s*'([a-fA-F0-9]{64})'", 1, pattern)
  | extend
      Algo_MD5='MD5',
      Algo_SHA1= 'SHA1',
      Algo_SHA256='SHA256',
      ProviderName = 'CYFIRMA',
      ProductName = 'DeCYFIR/DeTCT'
  | project  
      MD5,
      SHA1,
      SHA256,
      Algo_MD5,
      Algo_SHA1,
      Algo_SHA256,
      ThreatActors,
      Sources,
      RecommendedActions,
      Roles,
      Country,
      name,
      Description,
      ConfidenceScore,
      SecurityVendors,
      IndicatorID,
      created,
      modified,
      valid_from,
      Tags,
      ThreatType,
      TimeGenerated,
      ProductName,
      ProviderName  
suppressionEnabled: true
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/FileHashIndicatorsBlockHighSeverityRule.yaml

ARM