CYFIRMA - High severity Malicious Network Indicators Associated with Malware - Monitor Recommended Rule

Back


Id	c7b0b6da-e9dc-405d-ad71-37661f56d40a
Rulename	CYFIRMA - High severity Malicious Network Indicators Associated with Malware - Monitor Recommended 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	InitialAccess Execution CommandAndControl
Techniques	T1566 T1189 T1204 T1071 T1090 T1059 T1568 T1566.002 T1204.001 T1071.001 T1568.002
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/MalwareNetworkIndicatorsMonitorHighSeverityRule.yaml
Version	1.0.1
Arm template	c7b0b6da-e9dc-405d-ad71-37661f56d40a.json

KQL

//Network Indicators Associated with Malware - Monitor Recommended Rule
let timeFrame= 5m;
CyfirmaIndicators_CL 
| where ConfidenceScore >= 80
    and TimeGenerated between (ago(timeFrame) .. now())
    and pattern !contains 'file:hashes' and RecommendedActions has 'Monitor' and Roles has 'Malware'
| 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:
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
  createIncident: true
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."  
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence Malicious Network Indicators Associated with Malware - Monitor Recommended - {{name}} '
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDescriptionFormat: '{{Description}} - {{name}} '
query: |
  //Network Indicators Associated with Malware - Monitor Recommended Rule
  let timeFrame= 5m;
  CyfirmaIndicators_CL 
  | where ConfidenceScore >= 80
      and TimeGenerated between (ago(timeFrame) .. now())
      and pattern !contains 'file:hashes' and RecommendedActions has 'Monitor' and Roles has 'Malware'
  | 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  
eventGroupingSettings:
  aggregationKind: AlertPerResult
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
name: CYFIRMA - High severity Malicious Network Indicators Associated with Malware - Monitor Recommended Rule
relevantTechniques:
- T1566
- T1189
- T1204
- T1071
- T1090
- T1059
- T1568
- T1566.002
- T1204.001
- T1071.001
- T1568.002
suppressionDuration: 5m
enabled: false
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPv4
    identifier: Address
- entityType: IP
  fieldMappings:
  - columnName: IPv6
    identifier: Address
- entityType: DNS
  fieldMappings:
  - columnName: Domain
    identifier: DomainName
- entityType: URL
  fieldMappings:
  - columnName: URL
    identifier: Url
tactics:
- InitialAccess
- Execution
- CommandAndControl
queryPeriod: 5m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/MalwareNetworkIndicatorsMonitorHighSeverityRule.yaml
triggerThreshold: 0
severity: High
kind: Scheduled
suppressionEnabled: true
queryFrequency: 5m
id: c7b0b6da-e9dc-405d-ad71-37661f56d40a
version: 1.0.1
customDetails:
  TimeGenerated: TimeGenerated
  Description: Description
  IndicatorID: IndicatorID
  RecommendedActions: RecommendedActions
  ConfidenceScore: ConfidenceScore
  SecurityVendors: SecurityVendors
  Created: created
  ValidFrom: valid_from
  Sources: Sources
  ThreatType: ThreatType
  Country: Country
  Modified: modified
  IPAbuse: IPAbuse
  Roles: Roles
  Tags: Tags
  ThreatActors: ThreatActors
triggerOperator: GreaterThan

ARM