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

Back


Id	b89c893e-650f-4569-afc3-c487efee2472
Rulename	CYFIRMA - Medium 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	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/TrojanFileHashIndicatorsMonitorMediumSeverityRule.yaml
Version	1.0.1
Arm template	b89c893e-650f-4569-afc3-c487efee2472.json

KQL

//Trojan File Hash Indicators with Monitor 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 '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

suppressionEnabled: true
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: AllEntities
    lookbackDuration: PT5H
    reopenClosedIncident: false
    enabled: false
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
relevantTechniques:
- T1566
- T1204
- T1547
- T1027
- T1071
- T1003
- T1566.001
- T1547.001
triggerOperator: GreaterThan
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/TrojanFileHashIndicatorsMonitorMediumSeverityRule.yaml
version: 1.0.1
customDetails:
  ThreatActors: ThreatActors
  RecommendedActions: RecommendedActions
  Description: Description
  SecurityVendors: SecurityVendors
  Tags: Tags
  Country: Country
  ValidFrom: valid_from
  ConfidenceScore: ConfidenceScore
  ThreatType: ThreatType
  IndicatorID: IndicatorID
  Sources: Sources
  TimeGenerated: TimeGenerated
  modified: modified
  created: created
  Roles: Roles
queryFrequency: 5m
severity: Medium
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."  
triggerThreshold: 0
suppressionDuration: 5m
entityMappings:
- 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
  entityType: FileHash
alertDetailsOverride:
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDisplayNameFormat: 'High-Confidence Trojan File Hash Indicators with Monitor Action - {{name}} '
name: CYFIRMA - Medium severity Trojan File Hash Indicators with Monitor Action Rule
query: |
  //Trojan File Hash Indicators with Monitor 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 '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  
tactics:
- InitialAccess
- Execution
- Persistence
- DefenseEvasion
- CommandAndControl
- CredentialAccess
queryPeriod: 5m
kind: Scheduled
id: b89c893e-650f-4569-afc3-c487efee2472
enabled: false
eventGroupingSettings:
  aggregationKind: AlertPerResult

ARM