Signature Detail
Short Name |
DNS:TUNNEL:NULL-RECORD |
|---|---|
Severity |
Medium |
Recommended |
Yes |
Category |
DNS |
Keywords |
Iodine |
Release Date |
2013/12/04 |
Update Number |
2324 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
DNS: NULL Record Type
This signature detects DNS requests with a record type set to "Null". This is not common DNS traffic and is indicative of DNS tunneling. Blocking these packets will usually block the tunnel.