CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule

Back


Id	baa63d52-285d-43bf-a34e-8ed2fa260f9e
Rulename	CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule
Description	“This analytics rule detects network-based indicators flagged by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure. These indicators may represent attacker-controlled endpoints used for persistence, data exfiltration, or command delivery to compromised systems.”
Severity	Medium
Tactics	Impact Persistence DefenseEvasion CredentialAccess CommandAndControl Execution InitialAccess
Techniques	T1496 T1053 T1555 T1090 T1071 T1204 T1189 T1053.005 T1555.003 T1071.001 T1204.001
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/TrojanNetworkIndicatorsBlockMediumSeverityRule.yaml
Version	1.0.1
Arm template	baa63d52-285d-43bf-a34e-8ed2fa260f9e.json

KQL

//Trojan Network Indicators - Block Recommended
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 'Trojan'
| 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

queryFrequency: 5m
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
eventGroupingSettings:
  aggregationKind: AlertPerResult
version: 1.0.1
suppressionEnabled: true
id: baa63d52-285d-43bf-a34e-8ed2fa260f9e
suppressionDuration: 5m
severity: Medium
kind: Scheduled
requiredDataConnectors:
- connectorId: CyfirmaCyberIntelligenceDC
  dataTypes:
  - CyfirmaIndicators_CL
description: |
  "This analytics rule detects network-based indicators flagged by CYFIRMA threat intelligence as associated with Command & Control (C2) infrastructure. 
  These indicators may represent attacker-controlled endpoints used for persistence, data exfiltration, or command delivery to compromised systems."  
query: |
  //Trojan Network Indicators - Block Recommended
  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 'Trojan'
  | 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  
triggerOperator: GreaterThan
name: CYFIRMA - Medium severity Trojan Network Indicators - Block Recommended Rule
tactics:
- Impact
- Persistence
- DefenseEvasion
- CredentialAccess
- CommandAndControl
- Execution
- InitialAccess
alertDetailsOverride:
  alertDescriptionFormat: '{{Description}} - {{name}} '
  alertDynamicProperties:
  - value: ProductName
    alertProperty: ProductName
  - value: ProviderName
    alertProperty: ProviderName
  alertDisplayNameFormat: 'High-Confidence Trojan Network Indicators - Block Recommended Rule - {{name}} '
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Cyber Intelligence/Analytic Rules/TrojanNetworkIndicatorsBlockMediumSeverityRule.yaml
triggerThreshold: 0
queryPeriod: 5m
enabled: false
relevantTechniques:
- T1496
- T1053
- T1555
- T1090
- T1071
- T1204
- T1189
- T1053.005
- T1555.003
- T1071.001
- T1204.001
customDetails:
  ValidFrom: valid_from
  SecurityVendors: SecurityVendors
  IPAbuse: IPAbuse
  Sources: Sources
  ConfidenceScore: ConfidenceScore
  ThreatType: ThreatType
  ThreatActors: ThreatActors
  Description: Description
  Created: created
  RecommendedActions: RecommendedActions
  TimeGenerated: TimeGenerated
  IndicatorID: IndicatorID
  Roles: Roles
  Tags: Tags
  Modified: modified
  Country: Country
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    lookbackDuration: PT5H
    enabled: false
    reopenClosedIncident: false
    matchingMethod: AllEntities

ARM