CYFIRMA - High severity Trojan File Hash Indicators with Monitor Action Rule

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Id	4afd8960-8bee-4cac-bb5e-a4f200b1f9f3
Rulename	CYFIRMA - High severity Trojan File Hash Indicators with Monitor Action Rule
Description	“This KQL query extracts file hash indicators associated with Trojan activity from the CyfirmaIndicators_CL table. It specifically targets indicators containing file hashes linked to Trojan behavior and retrieves MD5, SHA1, and SHA256 values. The query also includes contextual threat intelligence such as threat actors, tags, sources, and geolocation information.”
Severity	High
Tactics	InitialAccess Execution Persistence DefenseEvasion CommandAndControl CredentialAccess
Techniques	T1566 T1204 T1547 T1027 T1071 T1003 T1566.001 T1547.001
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/TrojanFileHashIndicatorsMonitorHighSeverityRule.yaml
Version	1.0.1
Arm template	4afd8960-8bee-4cac-bb5e-a4f200b1f9f3.json

KQL

//Trojan File Hash Indicators with Monitor Action
let timeFrame = 5m;
CyfirmaIndicators_CL 
| where ConfidenceScore >= 80
    and TimeGenerated between (ago(timeFrame) .. now())
    and pattern contains 'file:hashes' and RecommendedActions has 'Monitor' and (Roles contains '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,
    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

customDetails:
  Tags: Tags
  Sources: Sources
  ThreatType: ThreatType
  modified: modified
  ConfidenceScore: ConfidenceScore
  ThreatActors: ThreatActors
  ValidFrom: valid_from
  RecommendedActions: RecommendedActions
  created: created
  Description: Description
  Country: Country
  IndicatorID: IndicatorID
  Roles: Roles
  SecurityVendors: SecurityVendors
  TimeGenerated: TimeGenerated
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/TrojanFileHashIndicatorsMonitorHighSeverityRule.yaml
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence Trojan File Hash Indicators with Monitor Action - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
query: |
  //Trojan File Hash Indicators with Monitor Action
  let timeFrame = 5m;
  CyfirmaIndicators_CL 
  | where ConfidenceScore >= 80
      and TimeGenerated between (ago(timeFrame) .. now())
      and pattern contains 'file:hashes' and RecommendedActions has 'Monitor' and (Roles contains '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,
      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  
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
  createIncident: true
relevantTechniques:
- T1566
- T1204
- T1547
- T1027
- T1071
- T1003
- T1566.001
- T1547.001
kind: Scheduled
name: CYFIRMA - High severity Trojan File Hash Indicators with Monitor Action Rule
tactics:
- InitialAccess
- Execution
- Persistence
- DefenseEvasion
- CommandAndControl
- CredentialAccess
severity: High
suppressionDuration: 5m
enabled: false
triggerOperator: GreaterThan
description: |
  "This KQL query extracts file hash indicators associated with Trojan activity from the CyfirmaIndicators_CL table. 
  It specifically targets indicators containing file hashes linked to Trojan behavior and retrieves MD5, SHA1, and SHA256 values. 
  The query also includes contextual threat intelligence such as threat actors, tags, sources, and geolocation information."  
queryFrequency: 5m
triggerThreshold: 0
queryPeriod: 5m
version: 1.0.1
suppressionEnabled: true
entityMappings:
- 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
  entityType: FileHash
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: 4afd8960-8bee-4cac-bb5e-a4f200b1f9f3

ARM