DNS-over-HTTPS Enabled by Registry
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About the rule
Rule Type
Standard
Rule Description
Detects when a user enables DNS-over-HTTPS. This can be used to hide internet activity or be used to hide the process of exfiltrating data. With this enabled organization will lose visibility into data such as query type, response and originating IP that are used to determine bad actors.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Registry value modified" AND ((OBJECTNAME endswith "\SOFTWARE\Policies\Microsoft\Edge\BuiltInDnsClientEnabled" OR (OBJECTNAME endswith "\SOFTWARE\Policies\Microsoft\Edge" AND OBJECTVALUENAME = "BuiltInDnsClientEnabled")) AND (INFORMATION = "DWORD (0x00000001)" OR (CHANGES = 1 AND NEWTYPE = "REG_DWORD"))) OR ((OBJECTNAME endswith "\SOFTWARE\Google\Chrome\DnsOverHttpsMode" OR (OBJECTNAME endswith "\SOFTWARE\Google\Chrome" AND OBJECTVALUENAME = "DnsOverHttpsMode")) AND INFORMATION = "secure") OR ((OBJECTNAME endswith "\SOFTWARE\Policies\Mozilla\Firefox\DNSOverHTTPS\Enabled" OR (OBJECTNAME endswith "\SOFTWARE\Policies\Mozilla\Firefox\DNSOverHTTPS" AND OBJECTVALUENAME = "Enabled")) AND (INFORMATION = "DWORD (0x00000001)" OR (CHANGES = 1 AND NEWTYPE = "REG_DWORD"))) select Action1.HOSTNAME,Action1.MESSAGE,Action1.OBJECTNAME,Action1.PROCESSNAME,Action1.PREVVAL,Action1.CHANGES
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Austin Songer
