CYFIRMA - Medium severity Malicious Network Indicators Associated with Malware - Block Recommended Rule

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Id	77226d6e-1263-42b1-a40d-8a756407ad4c
Rulename	CYFIRMA - Medium severity Malicious Network Indicators Associated with Malware - Block 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	Medium
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/MalwareNetworkIndicatorsBlockMediumSeverityRule.yaml
Version	1.0.1
Arm template	77226d6e-1263-42b1-a40d-8a756407ad4c.json

KQL

//Network Indicators Associated with Malware - Block Recommended Rule
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 '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

customDetails:
  Tags: Tags
  Sources: Sources
  ThreatType: ThreatType
  IPAbuse: IPAbuse
  Modified: modified
  ConfidenceScore: ConfidenceScore
  ThreatActors: ThreatActors
  ValidFrom: valid_from
  RecommendedActions: RecommendedActions
  Created: created
  Description: Description
  Country: Country
  IndicatorID: IndicatorID
  Roles: Roles
  SecurityVendors: SecurityVendors
  TimeGenerated: TimeGenerated
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/MalwareNetworkIndicatorsBlockMediumSeverityRule.yaml
alertDetailsOverride:
  alertDisplayNameFormat: 'High-Confidence Malicious Network Indicators Associated with Malware - Block Recommended - {{name}} '
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
query: |
  //Network Indicators Associated with Malware - Block Recommended Rule
  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 '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  
requiredDataConnectors:
- dataTypes:
  - CyfirmaIndicators_CL
  connectorId: CyfirmaCyberIntelligenceDC
incidentConfiguration:
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
  createIncident: true
relevantTechniques:
- T1566
- T1189
- T1204
- T1071
- T1090
- T1059
- T1568
- T1566.002
- T1204.001
- T1071.001
- T1568.002
kind: Scheduled
name: CYFIRMA - Medium severity Malicious Network Indicators Associated with Malware - Block Recommended Rule
tactics:
- InitialAccess
- Execution
- CommandAndControl
severity: Medium
suppressionDuration: 5m
enabled: false
triggerOperator: GreaterThan
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."  
queryFrequency: 5m
triggerThreshold: 0
queryPeriod: 5m
version: 1.0.1
suppressionEnabled: true
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: IPv4
  entityType: IP
- fieldMappings:
  - identifier: Address
    columnName: IPv6
  entityType: IP
- fieldMappings:
  - identifier: DomainName
    columnName: Domain
  entityType: DNS
- fieldMappings:
  - identifier: Url
    columnName: URL
  entityType: URL
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: 77226d6e-1263-42b1-a40d-8a756407ad4c

ARM