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

Back


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

incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    lookbackDuration: PT5H
    matchingMethod: AllEntities
    enabled: false
relevantTechniques:
- T1071
- T1090
- T1573
- T1105
- T1568
- T1566
- T1041
- T1071.001
- T1573.001
- T1568.002
- T1566.002
queryFrequency: 5m
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence Command & Control Network Indicators with Block Recommendation Rule - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
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."  
customDetails:
  TimeGenerated: TimeGenerated
  IndicatorID: IndicatorID
  IPAbuse: IPAbuse
  Modified: modified
  SecurityVendors: SecurityVendors
  Created: created
  ConfidenceScore: ConfidenceScore
  Tags: Tags
  RecommendedActions: RecommendedActions
  ThreatActors: ThreatActors
  Sources: Sources
  Country: Country
  ValidFrom: valid_from
  ThreatType: ThreatType
  Description: Description
  Roles: Roles
triggerThreshold: 0
enabled: false
name: CYFIRMA - High severity Command & Control Network Indicators with Block Recommendation Rule
queryPeriod: 5m
id: 6b61b716-afd9-4f6c-ad00-965d5987cafd
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  
version: 1.0.1
eventGroupingSettings:
  aggregationKind: AlertPerResult
triggerOperator: gt
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
requiredDataConnectors:
- connectorId: CyfirmaCyberIntelligenceDC
  dataTypes:
  - CyfirmaIndicators_CL
suppressionDuration: 5m
severity: High
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/C2NetworkIndicatorsBlockHighSeverityRule.yaml
tactics:
- CommandAndControl
- InitialAccess
- Exfiltration
suppressionEnabled: true
kind: Scheduled

ARM