A DNS sinkhole, also known as a sinkhole server, Internet sinkhole, or Blackhole DNS is a Domain Name System (DNS) server that has been configured to hand out non-routable addresses for a certain set of domain names. Computers that use the sinkhole fail to access the real site.
How to implement DNS sinkhole?
Enabling DNS Sinkhole and configuring it
1Navigate to Network DNS DNS Security DNS Sinkhole Service. 2) Enable the option Enable DNS Sinkhole Service. 3) Select one of the available three options from Action dropdown. 4) Navigate to Custom Malicious Domain Name List and click Add. Enter domain name Yahoo.com and click Save.
What is a DNS sinkhole?
What is a "DNS Sinkhole"? DNS Sinkholing is a mechanism aimed at protecting users by intercepting DNS request attempting to connect to known malicious or unwanted domains and returning a false, or rather controlled IP address.
How do I find my DNS sinkhole?
If you want to find DNS sinkholes, there are a few tested methods for identifying them. First, try reviewing the WHOIS nameservers information and SSL certificates. These are probably the two most straight-forward sources. Because of this, you'll probably find more security companies sinkholing for research purposes.
Background
DNS servers resolve names, like "www.sans.org", to IP addresses. But there are fully-qualified domain names (FQDNs) which we do not want our users to successfully resolve, e.g., the names used for malware, spyware, phishing, scams, pornography, hate groups, bandwidth-wasting video sites, social networking sites unrelated to work, etc. Most organiza
Requirements
To use the PowerShell DNS sinkhole script (download it here), you must: 1. Have PowerShell2.0 or later on the computer where the script will be run, which may be the DNS server itself or another management workstation. 2. Use Windows Server 2003 with SP2 or later for the DNS server. 3. Allow network access to the RPC ports of the Windows Management
Example Uses
To see the script's command-line options (don't forget the ".\\" before the script name): To sinkhole "www.sans.org" by making it resolve to "0.0.0.0": To sinkhole all the FQDNs and domain names listed in file.txt, removing any "www." leading strings, plus add a wildcard (*) record for each domain, all resolving to "0.0.0.0": To create sinkholed dom
Frequently Asked Questions
Q: Are the DNS zones replicated through Active Directory? A:No, these are standard primary zones using a text file. Q: If I sinkhole 10,000 domains, will the script create 10,000 zone files? A:No, one zone file named "000-sinkholed-domain.local.dns" is used by all of them. Q: If I'm not sitting at the DNS server, because it's remote, does that DNS
Intrusion Detection & Forensics
By default, the script will create sinkhole zones which resolve to "0.0.0.0", but there is a command-line parameter named "-SinkholeIP" with which you can set a different IP address for all your sinkholed zones. You might consider using the IP address of an internal server set up specifically for this purpose. Your internal sinkhole IDS server, let
Caveats & Legal Disclaimers
The script is fast when creating new sinkhole domains, even tens of thousands of them, but the script is slow when deleting (-DeleteSinkHoleDomains) or reloading (-ReloadSinkHoleDomains) these domains. These two operations will also run up a core of the CPU to over 90% while executing. How slow is "slow"? For example, in my testing, deleting or rel
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