CYFIRMA - Attack Surface - Malicious DomainIP Reputation Medium Rule

Back


Id	70f137e4-e4ef-4635-92de-10c4f5b0fcd0
Rulename	CYFIRMA - Attack Surface - Malicious Domain/IP Reputation Medium Rule
Description	“This alert is raised when CYFIRMA detects a critical reputation score for an IP address linked to your infrastructure. The IP has been previously associated with hacking activity and web application attacks. Denied outbound traffic to a foreign country from a known Microsoft data center IP suggests potential misuse or compromise of cloud infrastructure.”
Severity	Medium
Tactics	InitialAccess CommandAndControl Reconnaissance Impact DefenseEvasion Exfiltration
Techniques	T1566 T1071 T1090 T1595 T1499 T1036 T1041
Required data connectors	CyfirmaAttackSurfaceAlertsConnector
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 Attack Surface/Analytic Rules/ASDomainIPreputationsMediumRule.yaml
Version	1.0.1
Arm template	70f137e4-e4ef-4635-92de-10c4f5b0fcd0.json

KQL

// Medium Severity - Malicious Domain/IP Reputation Detected
let timeFrame = 5m;
CyfirmaASDomainIPReputationAlerts_CL
| where severity == 'High' and TimeGenerated between (ago(timeFrame) .. now())
| extend
    FirstSeen=first_seen,
    LastSeen=last_seen,
    RiskScore=risk_score,
    Domain=sub_domain,
    TopDomain=top_domain,
    NetworkIP=ip,
    AlertUID=alert_uid,
    UID=uid,
    Categories=categories,
    IPversion=ip_version,
    ISP=isp,
    ThreatActors=threat_actors,
    Country=country,
    LastUsersReported=last_users_reported,
    ProviderName='CYFIRMA',
    ProductName='DeCYFIR/DeTCT'
| project
    TimeGenerated,
    Domain,
    TopDomain,
    RiskScore,
    FirstSeen,
    LastSeen,
    NetworkIP,
    AlertUID,
    UID,
    Categories,
    IPversion,
    ISP,
    ThreatActors,
    Country,
    LastUsersReported,
    ProviderName,
    ProductName

YAML

status: Available
query: |
  // Medium Severity - Malicious Domain/IP Reputation Detected
  let timeFrame = 5m;
  CyfirmaASDomainIPReputationAlerts_CL
  | where severity == 'High' and TimeGenerated between (ago(timeFrame) .. now())
  | extend
      FirstSeen=first_seen,
      LastSeen=last_seen,
      RiskScore=risk_score,
      Domain=sub_domain,
      TopDomain=top_domain,
      NetworkIP=ip,
      AlertUID=alert_uid,
      UID=uid,
      Categories=categories,
      IPversion=ip_version,
      ISP=isp,
      ThreatActors=threat_actors,
      Country=country,
      LastUsersReported=last_users_reported,
      ProviderName='CYFIRMA',
      ProductName='DeCYFIR/DeTCT'
  | project
      TimeGenerated,
      Domain,
      TopDomain,
      RiskScore,
      FirstSeen,
      LastSeen,
      NetworkIP,
      AlertUID,
      UID,
      Categories,
      IPversion,
      ISP,
      ThreatActors,
      Country,
      LastUsersReported,
      ProviderName,
      ProductName  
name: CYFIRMA - Attack Surface - Malicious Domain/IP Reputation Medium Rule
queryPeriod: 5m
kind: Scheduled
relevantTechniques:
- T1566
- T1071
- T1090
- T1595
- T1499
- T1036
- T1041
id: 70f137e4-e4ef-4635-92de-10c4f5b0fcd0
customDetails:
  Country: Country
  UID: UID
  FirstSeen: FirstSeen
  AlertUID: AlertUID
  LastSeen: LastSeen
  RiskScore: RiskScore
  ThreatActors: ThreatActors
  TimeGenerated: TimeGenerated
  IPversion: IPversion
  LastUsersReported: LastUsersReported
  Categories: Categories
  ISP: ISP
triggerOperator: gt
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: false
    enabled: false
    matchingMethod: AllEntities
    lookbackDuration: PT5H
version: 1.0.1
tactics:
- InitialAccess
- CommandAndControl
- Reconnaissance
- Impact
- DefenseEvasion
- Exfiltration
eventGroupingSettings:
  aggregationKind: AlertPerResult
severity: Medium
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Cyfirma Attack Surface/Analytic Rules/ASDomainIPreputationsMediumRule.yaml
queryFrequency: 5m
entityMappings:
- fieldMappings:
  - columnName: Domain
    identifier: DomainName
  entityType: DNS
- fieldMappings:
  - columnName: TopDomain
    identifier: HostName
  - columnName: Domain
    identifier: DnsDomain
  entityType: Host
- fieldMappings:
  - columnName: NetworkIP
    identifier: Address
  entityType: IP
requiredDataConnectors:
- dataTypes:
  - CyfirmaASDomainIPReputationAlerts_CL
  connectorId: CyfirmaAttackSurfaceAlertsConnector
alertDetailsOverride:
  alertDynamicProperties:
  - alertProperty: ProductName
    value: ProductName
  - alertProperty: ProviderName
    value: ProviderName
  alertDisplayNameFormat: 'CYFIRMA - Medium Severity Malicious Domain/IP Reputation Alert - Domain: {{Domain}}, IP: {{NetworkIP}} '
  alertDescriptionFormat: 'CYFIRMA - Medium Severity Malicious Domain/IP Reputation Alert - Domain: {{Domain}}, IP: {{NetworkIP}} '
description: |
  "This alert is raised when CYFIRMA detects a critical reputation score for an IP address linked to your infrastructure. 
  The IP has been previously associated with hacking activity and web application attacks. 
  Denied outbound traffic to a foreign country from a known Microsoft data center IP suggests potential misuse or compromise of cloud infrastructure."

ARM