ISATAP Router Address Was Set

calendar Oct 21, 2025 · attack.initial-access attack.privilege-escalation attack.execution attack.t1557 attack.t1565.002  ·
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Detects the configuration of a new ISATAP router on a Windows host. While ISATAP is a legitimate Microsoft technology for IPv6 transition, unexpected or unauthorized ISATAP router configurations could indicate a potential IPv6 DNS Takeover attack using tools like mitm6. In such attacks, adversaries advertise themselves as DHCPv6 servers and set malicious ISATAP routers to intercept traffic. This detection should be correlated with network baselines and known legitimate ISATAP deployments in your environment.

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 1title: ISATAP Router Address Was Set
 2id: d22df9cd-2aee-4089-93c7-9dc4eae77f2c
 3status: experimental
 4description: |
 5    Detects the configuration of a new ISATAP router on a Windows host. While ISATAP is a legitimate Microsoft technology for IPv6 transition, unexpected or unauthorized ISATAP router configurations could indicate a potential IPv6 DNS Takeover attack using tools like mitm6.
 6    In such attacks, adversaries advertise themselves as DHCPv6 servers and set malicious ISATAP routers to intercept traffic.
 7    This detection should be correlated with network baselines and known legitimate ISATAP deployments in your environment.    
 8references:
 9    - https://www.blackhillsinfosec.com/mitm6-strikes-again-the-dark-side-of-ipv6/
10    - https://redfoxsec.com/blog/ipv6-dns-takeover/
11    - https://www.securityhq.com/blog/malicious-isatap-tunneling-unearthed-on-windows-server/
12    - https://medium.com/@ninnesoturan/detecting-ipv6-dns-takeover-a54a6a88be1f
13author: hamid
14date: 2025-10-19
15tags:
16    - attack.initial-access
17    - attack.privilege-escalation
18    - attack.execution
19    - attack.t1557
20    - attack.t1565.002
21logsource:
22    product: windows
23    service: system
24detection:
25    selection:
26        EventID: 4100
27        Provider_Name: 'Microsoft-Windows-Iphlpsvc'
28    filter_main_localhost:
29        IsatapRouter:
30            - '127.0.0.1'
31            - '::1'
32    filter_optional_null:
33        IsatapRouter: null
34    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
35falsepositives:
36    - Legitimate ISATAP router configuration in enterprise environments
37    - IPv6 transition projects and network infrastructure changes
38    - Network administrators configuring dual-stack networking
39    - Automatic ISATAP configuration in some Windows deployments
40level: medium

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