CYFIRMA - High severity Command Control Network Indicators with Block Recommendation Rule

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Id	6b61b716-afd9-4f6c-ad00-965d5987cafd
Rulename	CYFIRMA - High severity Command & Control Network Indicators with Block Recommendation Rule
Description	“This analytics rule detects network-based indicators identified by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure. These may represent attacker-controlled endpoints used to maintain persistence, exfiltrate data, or receive commands from malware-infected hosts.”
Severity	High
Tactics	CommandAndControl InitialAccess Exfiltration
Techniques	T1071 T1090 T1573 T1105 T1568 T1566 T1041 T1071.001 T1573.001 T1568.002 T1566.002
Required data connectors	CyfirmaCyberIntelligenceDC
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/C2NetworkIndicatorsBlockHighSeverityRule.yaml
Version	1.0.1
Arm template	6b61b716-afd9-4f6c-ad00-965d5987cafd.json

KQL

// Network Indicators query with Block Recommended Action and C2 Roles
let timeFrame= 5m;
CyfirmaIndicators_CL 
| where ConfidenceScore >= 80
    and TimeGenerated between (ago(timeFrame) .. now())
    and pattern !contains 'file:hashes' and RecommendedActions has 'Block' and (Roles contains 'c2' or Roles contains 'Command & Control')
| 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

eventGroupingSettings:
  aggregationKind: AlertPerResult
version: 1.0.1
suppressionEnabled: true
query: |
  // Network Indicators query with Block Recommended Action and C2 Roles
  let timeFrame= 5m;
  CyfirmaIndicators_CL 
  | where ConfidenceScore >= 80
      and TimeGenerated between (ago(timeFrame) .. now())
      and pattern !contains 'file:hashes' and RecommendedActions has 'Block' and (Roles contains 'c2' or Roles contains 'Command & Control')
  | 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  
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
id: 6b61b716-afd9-4f6c-ad00-965d5987cafd
tactics:
- CommandAndControl
- InitialAccess
- Exfiltration
queryPeriod: 5m
queryFrequency: 5m
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPv4
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPv6
- entityType: DNS
  fieldMappings:
  - identifier: DomainName
    columnName: Domain
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: URL
customDetails:
  Sources: Sources
  Modified: modified
  Created: created
  ValidFrom: valid_from
  TimeGenerated: TimeGenerated
  SecurityVendors: SecurityVendors
  ThreatType: ThreatType
  IPAbuse: IPAbuse
  RecommendedActions: RecommendedActions
  Country: Country
  ConfidenceScore: ConfidenceScore
  Tags: Tags
  Roles: Roles
  IndicatorID: IndicatorID
  Description: Description
  ThreatActors: ThreatActors
triggerOperator: gt
triggerThreshold: 0
severity: High
relevantTechniques:
- T1071
- T1090
- T1573
- T1105
- T1568
- T1566
- T1041
- T1071.001
- T1573.001
- T1568.002
- T1566.002
enabled: false
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: false
    reopenClosedIncident: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
kind: Scheduled
suppressionDuration: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/C2NetworkIndicatorsBlockHighSeverityRule.yaml
name: CYFIRMA - High severity Command & Control Network Indicators with Block Recommendation Rule
alertDetailsOverride:
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDisplayNameFormat: 'High-Confidence Command & Control Network Indicators with Block Recommendation Rule - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
description: |
  "This analytics rule detects network-based indicators identified by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure.
  These may represent attacker-controlled endpoints used to maintain persistence, exfiltrate data, or receive commands from malware-infected hosts."

ARM