CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule

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Id	baa63d52-285d-43bf-a34e-8ed2fa260f9e
Rulename	CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule
Description	“This analytics rule detects network-based indicators flagged by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure. These indicators may represent attacker-controlled endpoints used for persistence, data exfiltration, or command delivery to compromised systems.”
Severity	Medium
Tactics	Impact Persistence DefenseEvasion CredentialAccess CommandAndControl Execution InitialAccess
Techniques	T1496 T1053 T1555 T1090 T1071 T1204 T1189 T1053.005 T1555.003 T1071.001 T1204.001
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/TrojanNetworkIndicatorsBlockMediumSeverityRule.yaml
Version	1.0.1
Arm template	baa63d52-285d-43bf-a34e-8ed2fa260f9e.json

KQL

//Trojan Network Indicators - Block Recommended
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 IPv4 = extract(@"ipv4-addr:value\s*=\s*'([^']+)'", 1, pattern)
| extend IPv6 = extract(@"ipv6-addr:value\s*=\s*'([^']+)'", 1, pattern)
| extend URL = extract(@"url:value\s*=\s*'([^']+)'", 1, pattern)
| extend Domain = extract(@"domain-name:value\s*=\s*'([^']+)'", 1, pattern)
| extend parsed = parse_json(extensions)
| extend extensionKeys = bag_keys(parsed)
| mv-expand extensionKeys
| extend extensionKeyStr = tostring(extensionKeys)
| extend ext = parsed[extensionKeyStr]
| extend props = ext.properties
| extend 
    extension_id = extensionKeyStr,
    ASN_Owner = props.asn_owner,
    ASN = props.asn,
    ProviderName = 'CYFIRMA',
    ProductName = 'DeCYFIR/DeTCT'
| project
    IPv4,
    IPv6,
    URL,
    Domain,
    ThreatActors,
    RecommendedActions,
    Sources,
    Roles,
    Country,
    IPAbuse,
    name,
    Description,
    ConfidenceScore,
    IndicatorID,
    created,
    modified,
    valid_from,
    Tags,
    ThreatType,
    TimeGenerated,
    SecurityVendors,
    ProductName,
    ProviderName

YAML

queryPeriod: 5m
query: |
  //Trojan Network Indicators - Block Recommended
  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 IPv4 = extract(@"ipv4-addr:value\s*=\s*'([^']+)'", 1, pattern)
  | extend IPv6 = extract(@"ipv6-addr:value\s*=\s*'([^']+)'", 1, pattern)
  | extend URL = extract(@"url:value\s*=\s*'([^']+)'", 1, pattern)
  | extend Domain = extract(@"domain-name:value\s*=\s*'([^']+)'", 1, pattern)
  | extend parsed = parse_json(extensions)
  | extend extensionKeys = bag_keys(parsed)
  | mv-expand extensionKeys
  | extend extensionKeyStr = tostring(extensionKeys)
  | extend ext = parsed[extensionKeyStr]
  | extend props = ext.properties
  | extend 
      extension_id = extensionKeyStr,
      ASN_Owner = props.asn_owner,
      ASN = props.asn,
      ProviderName = 'CYFIRMA',
      ProductName = 'DeCYFIR/DeTCT'
  | project
      IPv4,
      IPv6,
      URL,
      Domain,
      ThreatActors,
      RecommendedActions,
      Sources,
      Roles,
      Country,
      IPAbuse,
      name,
      Description,
      ConfidenceScore,
      IndicatorID,
      created,
      modified,
      valid_from,
      Tags,
      ThreatType,
      TimeGenerated,
      SecurityVendors,
      ProductName,
      ProviderName  
enabled: false
name: CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule
entityMappings:
- fieldMappings:
  - columnName: IPv4
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: IPv6
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: Domain
    identifier: DomainName
  entityType: DNS
- fieldMappings:
  - columnName: URL
    identifier: Url
  entityType: URL
incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: PT5H
    reopenClosedIncident: false
    matchingMethod: AllEntities
    enabled: false
  createIncident: true
suppressionDuration: 5m
suppressionEnabled: true
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence Trojan Network Indicators - Block Recommended Rule - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
description: |
  "This analytics rule detects network-based indicators flagged by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure. 
  These indicators may represent attacker-controlled endpoints used for persistence, data exfiltration, or command delivery to compromised systems."  
kind: Scheduled
version: 1.0.1
eventGroupingSettings:
  aggregationKind: AlertPerResult
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/TrojanNetworkIndicatorsBlockMediumSeverityRule.yaml
queryFrequency: 5m
severity: Medium
requiredDataConnectors:
- connectorId: CyfirmaCyberIntelligenceDC
  dataTypes:
  - CyfirmaIndicators_CL
triggerOperator: GreaterThan
triggerThreshold: 0
customDetails:
  SecurityVendors: SecurityVendors
  ValidFrom: valid_from
  IPAbuse: IPAbuse
  ThreatType: ThreatType
  TimeGenerated: TimeGenerated
  Roles: Roles
  Tags: Tags
  Description: Description
  Modified: modified
  IndicatorID: IndicatorID
  Created: created
  ThreatActors: ThreatActors
  RecommendedActions: RecommendedActions
  ConfidenceScore: ConfidenceScore
  Sources: Sources
  Country: Country
tactics:
- Impact
- Persistence
- DefenseEvasion
- CredentialAccess
- CommandAndControl
- Execution
- InitialAccess
id: baa63d52-285d-43bf-a34e-8ed2fa260f9e
relevantTechniques:
- T1496
- T1053
- T1555
- T1090
- T1071
- T1204
- T1189
- T1053.005
- T1555.003
- T1071.001
- T1204.001

ARM