Alerts for DNS
This article lists the security alerts you might get for DNS from Microsoft Defender for Cloud and any Microsoft Defender plans you enabled. The alerts shown in your environment depend on the resources and services you're protecting, and your customized configuration.
Note
Some of the recently added alerts powered by Microsoft Defender Threat Intelligence and Microsoft Defender for Endpoint might be undocumented.
Learn how to respond to these alerts.
Note
Alerts from different sources might take different amounts of time to appear. For example, alerts that require analysis of network traffic might take longer to appear than alerts related to suspicious processes running on virtual machines.
Alerts for DNS
Important
As of August 1 2023, customers with an existing subscription to Defender for DNS can continue to use the service, but new subscribers will receive alerts about suspicious DNS activity as part of Defender for Servers P2.
Anomalous network protocol usage
(AzureDNS_ProtocolAnomaly)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected anomalous protocol usage. Such traffic, while possibly benign, might indicate abuse of this common protocol to bypass network traffic filtering. Typical related attacker activity includes copying remote administration tools to a compromised host and exfiltrating user data from it.
MITRE tactics: Exfiltration
Severity: -
Anonymity network activity
(AzureDNS_DarkWeb)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected anonymity network activity. Such activity, while possibly legitimate user behavior, is frequently employed by attackers to evade tracking and fingerprinting of network communications. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Low
Anonymity network activity using web proxy
(AzureDNS_DarkWebProxy)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected anonymity network activity. Such activity, while possibly legitimate user behavior, is frequently employed by attackers to evade tracking and fingerprinting of network communications. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Low
Attempted communication with suspicious sinkholed domain
(AzureDNS_SinkholedDomain)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected request for sinkholed domain. Such activity, while possibly legitimate user behavior, is frequently an indication of the download or execution of malicious software. Typical related attacker activity is likely to include the download and execution of further malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Medium
Communication with possible phishing domain
(AzureDNS_PhishingDomain)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected a request for a possible phishing domain. Such activity, while possibly benign, is frequently performed by attackers to harvest credentials to remote services. Typical related attacker activity is likely to include the exploitation of any credentials on the legitimate service.
MITRE tactics: Exfiltration
Severity: Informational
Communication with suspicious algorithmically generated domain
(AzureDNS_DomainGenerationAlgorithm)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected possible usage of a domain generation algorithm. Such activity, while possibly benign, is frequently performed by attackers to evade network monitoring and filtering. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Informational
Communication with suspicious domain identified by threat intelligence
(AzureDNS_ThreatIntelSuspectDomain)
Description: Communication with suspicious domain was detected by analyzing DNS transactions from your resource and comparing against known malicious domains identified by threat intelligence feeds. Communication to malicious domains is frequently performed by attackers and could imply that your resource is compromised.
MITRE tactics: Initial Access
Severity: Medium
Communication with suspicious random domain name
(AzureDNS_RandomizedDomain)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected usage of a suspicious randomly generated domain name. Such activity, while possibly benign, is frequently performed by attackers to evade network monitoring and filtering. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Informational
Digital currency mining activity
(AzureDNS_CurrencyMining)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected digital currency mining activity. Such activity, while possibly legitimate user behavior, is frequently performed by attackers following compromise of resources. Typical related attacker activity is likely to include the download and execution of common mining tools.
MITRE tactics: Exfiltration
Severity: Low
Network intrusion detection signature activation
(AzureDNS_SuspiciousDomain)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected a known malicious network signature. Such activity, while possibly legitimate user behavior, is frequently an indication of the download or execution of malicious software. Typical related attacker activity is likely to include the download and execution of further malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Medium
Possible data download via DNS tunnel
(AzureDNS_DataInfiltration)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected a possible DNS tunnel. Such activity, while possibly legitimate user behavior, is frequently performed by attackers to evade network monitoring and filtering. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Low
Possible data exfiltration via DNS tunnel
(AzureDNS_DataExfiltration)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected a possible DNS tunnel. Such activity, while possibly legitimate user behavior, is frequently performed by attackers to evade network monitoring and filtering. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Low
Possible data transfer via DNS tunnel
(AzureDNS_DataObfuscation)
Description: Analysis of DNS transactions from %{CompromisedEntity} detected a possible DNS tunnel. Such activity, while possibly legitimate user behavior, is frequently performed by attackers to evade network monitoring and filtering. Typical related attacker activity is likely to include the download and execution of malicious software or remote administration tools.
MITRE tactics: Exfiltration
Severity: Low
Note
For alerts that are in preview: The Azure Preview Supplemental Terms include additional legal terms that apply to Azure features that are in beta, preview, or otherwise not yet released into general availability.
Next steps
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