CYFIRMA - Medium severity File Hash Indicators with Monitor Action and Malware

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Id	ca16daff-28dd-499d-93fe-0bb232d76d4f
Rulename	CYFIRMA - Medium severity File Hash Indicators with Monitor Action and Malware
Description	“This KQL query retrieves file hash indicators (MD5, SHA1, SHA256) from the CyfirmaIndicators_CL table within the last 5 minutes. It filters records with a confidence score of 80 or higher, containing file hash patterns, a recommended action of ‘Monitor’, and roles marked as ‘Malware’. Extracted hashes and key threat intelligence details are projected for monitoring and investigation.”
Severity	Medium
Tactics	DefenseEvasion InitialAccess Impact Execution
Techniques	T1027 T1486 T1204 T1485 T1218 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/MalwareFileHashIndicatorsMonitorMediumSeverityRule.yaml
Version	1.0.1
Arm template	ca16daff-28dd-499d-93fe-0bb232d76d4f.json

KQL

// File Hash Indicators with Monitor Action and Malware
let timeFrame = 5m;
CyfirmaIndicators_CL 
| where  (ConfidenceScore < 80 and ConfidenceScore >= 50)
    and TimeGenerated between (ago(timeFrame) .. now())
    and pattern contains 'file:hashes' and RecommendedActions has 'Monitor' and (Roles contains 'Malware')
| 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,
    Algo_MD5,
    SHA1,
    Algo_SHA1,
    SHA256,
    Algo_SHA256,
    ThreatActors,
    Sources,
    RecommendedActions,
    Roles,
    Country,
    name,
    Description,
    ConfidenceScore,
    SecurityVendors,
    IndicatorID,
    created,
    modified,
    valid_from,
    Tags,
    ThreatType,
    TimeGenerated,
    ProductName,
    ProviderName

YAML

description: |
  "This KQL query retrieves file hash indicators (MD5, SHA1, SHA256) from the CyfirmaIndicators_CL table within the last 5 minutes. 
  It filters records with a confidence score of 80 or higher, containing file hash patterns, a recommended action of 'Monitor', and roles marked as 'Malware'. 
  Extracted hashes and key threat intelligence details are projected for monitoring and investigation."  
tactics:
- DefenseEvasion
- InitialAccess
- Impact
- Execution
suppressionEnabled: true
suppressionDuration: 5m
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence File Hash Indicators with Monitor Action and Malware - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProviderName
    alertProperty: ProviderName
  - value: ProductName
    alertProperty: ProductName
incidentConfiguration:
  groupingConfiguration:
    enabled: false
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true
id: ca16daff-28dd-499d-93fe-0bb232d76d4f
severity: Medium
eventGroupingSettings:
  aggregationKind: AlertPerResult
customDetails:
  Tags: Tags
  TimeGenerated: TimeGenerated
  SecurityVendors: SecurityVendors
  Country: Country
  ThreatActors: ThreatActors
  valid_from: valid_from
  Roles: Roles
  ThreatType: ThreatType
  IndicatorID: IndicatorID
  RecommendedActions: RecommendedActions
  Sources: Sources
  Description: Description
  ConfidenceScore: ConfidenceScore
  created: created
  modified: modified
query: |
  // File Hash Indicators with Monitor Action and Malware
  let timeFrame = 5m;
  CyfirmaIndicators_CL 
  | where  (ConfidenceScore < 80 and ConfidenceScore >= 50)
      and TimeGenerated between (ago(timeFrame) .. now())
      and pattern contains 'file:hashes' and RecommendedActions has 'Monitor' and (Roles contains 'Malware')
  | 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,
      Algo_MD5,
      SHA1,
      Algo_SHA1,
      SHA256,
      Algo_SHA256,
      ThreatActors,
      Sources,
      RecommendedActions,
      Roles,
      Country,
      name,
      Description,
      ConfidenceScore,
      SecurityVendors,
      IndicatorID,
      created,
      modified,
      valid_from,
      Tags,
      ThreatType,
      TimeGenerated,
      ProductName,
      ProviderName  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/MalwareFileHashIndicatorsMonitorMediumSeverityRule.yaml
kind: Scheduled
queryPeriod: 5m
enabled: false
name: CYFIRMA - Medium severity File Hash Indicators with Monitor Action and Malware
queryFrequency: 5m
triggerThreshold: 0
relevantTechniques:
- T1027
- T1486
- T1204
- T1485
- T1218
- T1566.001
version: 1.0.1
entityMappings:
- entityType: FileHash
  fieldMappings:
  - identifier: Algorithm
    columnName: Algo_MD5
  - identifier: Value
    columnName: MD5
- entityType: FileHash
  fieldMappings:
  - identifier: Algorithm
    columnName: Algo_SHA1
  - identifier: Value
    columnName: SHA1
- entityType: FileHash
  fieldMappings:
  - identifier: Algorithm
    columnName: Algo_SHA256
  - identifier: Value
    columnName: SHA256
triggerOperator: GreaterThan

ARM