10.2. DNS Resources
Trisul extracts domain names from DNS Question and Answer records on the network. Even hosts that do not receive a reply or those in the ‘additional records’ section are pulled out.
10.2.1 Searching
Click on Resources → DNS Resources
- Open the Search Criteria box by clicking on “Show”
- Tabs “Search by endpoints” or “Search by regex”
Search by endpoints
You can search by
- IP
- Exclude these IPS
- Pair of IPs
- Port
- Timeframe
- Regex Pattern
- Invert Regex Pattren
Search by regex
You can search by a single regular expression or bulk substring matching.
A single perl compatible regex
Enter a single regex in the Pattern box. It must be on a single line.
For example v16.cache?.*youtube.com$
will match tc.v16.cache8.c.youtube.com
but not v16.cache18.c.youtube.com
Multiple patterns for substring matches
Enter a list of patterns one per line.
Use this if you want to search for hundreds of domains at once. This is a substring match so you cannot use any regexes.
10.2.2 Search results
Matching resources are shown in a table.
Click on “Options” for further options.
- Related flow(s) – find TCP/UDP flow that transferred the resource
- Details – Resource details in a single page
- Show Headers – PCAP headers in text and hexdump (first 50K bytes)
- Download PCAP – PCAP containing the flow(s) that transferred the resource
- Add to briefcase – Add to PCAP briefcase for later download
Click on “Download PCAP” button to get a PCAP file with all resources shown in table