CYFIRMA - Medium severity Trojan File Hash Indicators with Block Action Rule

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Id	25686f44-5f5f-4388-95e2-eea244481438
Rulename	CYFIRMA - Medium severity Trojan File Hash Indicators with Block 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	Medium
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/TrojanFileHashIndicatorsBlockMediumSeverityRule.yaml
Version	1.0.1
Arm template	25686f44-5f5f-4388-95e2-eea244481438.json

KQL

//Trojan File Hash Indicators with Block Action
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 'Block' and (Roles has '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

name: CYFIRMA - Medium severity Trojan File Hash Indicators with Block Action Rule
queryFrequency: 5m
kind: Scheduled
queryPeriod: 5m
id: 25686f44-5f5f-4388-95e2-eea244481438
incidentConfiguration:
  groupingConfiguration:
    enabled: false
    reopenClosedIncident: false
    lookbackDuration: PT5H
    matchingMethod: AllEntities
  createIncident: true
eventGroupingSettings:
  aggregationKind: AlertPerResult
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."  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/TrojanFileHashIndicatorsBlockMediumSeverityRule.yaml
suppressionEnabled: true
triggerThreshold: 0
entityMappings:
- entityType: FileHash
  fieldMappings:
  - identifier: Value
    columnName: MD5
  - identifier: Algorithm
    columnName: Algo_MD5
- entityType: FileHash
  fieldMappings:
  - identifier: Value
    columnName: SHA1
  - identifier: Algorithm
    columnName: Algo_SHA1
- entityType: FileHash
  fieldMappings:
  - identifier: Value
    columnName: SHA256
  - identifier: Algorithm
    columnName: Algo_SHA256
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
severity: Medium
version: 1.0.1
tactics:
- InitialAccess
- Execution
- Persistence
- DefenseEvasion
- CommandAndControl
- CredentialAccess
customDetails:
  ValidFrom: valid_from
  ThreatType: ThreatType
  Sources: Sources
  IndicatorID: IndicatorID
  Description: Description
  ConfidenceScore: ConfidenceScore
  Roles: Roles
  created: created
  RecommendedActions: RecommendedActions
  ThreatActors: ThreatActors
  Country: Country
  SecurityVendors: SecurityVendors
  TimeGenerated: TimeGenerated
  Tags: Tags
  modified: modified
enabled: false
query: |
  //Trojan File Hash Indicators with Block Action
  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 'Block' and (Roles has '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  
suppressionDuration: 5m
alertDetailsOverride:
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDisplayNameFormat: 'High-Confidence Trojan File Hash Indicators with Block Action Rule - {{name}} '
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
relevantTechniques:
- T1566
- T1204
- T1547
- T1027
- T1071
- T1003
- T1566.001
- T1547.001

ARM