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

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Id	b278be0f-0662-47b4-9ab5-71a0f1435c3f
Rulename	CYFIRMA - Medium 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	Medium
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/C2NetworkIndicatorsBlockMediumSeverityRule.yaml
Version	1.0.1
Arm template	b278be0f-0662-47b4-9ab5-71a0f1435c3f.json

KQL

// Network Indicators query with Block Recommended Action and C2 Roles
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 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

kind: Scheduled
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: PT5H
    enabled: false
    matchingMethod: AllEntities
    reopenClosedIncident: false
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
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."  
eventGroupingSettings:
  aggregationKind: AlertPerResult
customDetails:
  Modified: modified
  IPAbuse: IPAbuse
  ThreatType: ThreatType
  Description: Description
  Country: Country
  RecommendedActions: RecommendedActions
  SecurityVendors: SecurityVendors
  Tags: Tags
  TimeGenerated: TimeGenerated
  Created: created
  ThreatActors: ThreatActors
  ConfidenceScore: ConfidenceScore
  Sources: Sources
  ValidFrom: valid_from
  Roles: Roles
  IndicatorID: IndicatorID
version: 1.0.1
query: |
  // Network Indicators query with Block Recommended Action and C2 Roles
  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 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  
relevantTechniques:
- T1071
- T1090
- T1573
- T1105
- T1568
- T1566
- T1041
- T1071.001
- T1573.001
- T1568.002
- T1566.002
queryPeriod: 5m
enabled: false
queryFrequency: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/C2NetworkIndicatorsBlockMediumSeverityRule.yaml
suppressionDuration: 5m
severity: Medium
suppressionEnabled: true
id: b278be0f-0662-47b4-9ab5-71a0f1435c3f
triggerThreshold: 0
requiredDataConnectors:
- connectorId: CyfirmaCyberIntelligenceDC
  dataTypes:
  - CyfirmaIndicators_CL
tactics:
- CommandAndControl
- InitialAccess
- Exfiltration
name: CYFIRMA - Medium severity Command & Control Network Indicators with Block Recommendation Rule
alertDetailsOverride:
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
  alertDisplayNameFormat: 'High-Confidence Command & Control Network Indicators with Block Recommendation Rule - {{name}} '
triggerOperator: gt

ARM