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

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

ARM