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.
Short Name
DNS:TUNNEL:NULL-RECORD
Severity
Minor
Recommended
False
Recommended Action
None
Category
DNS
Keywords
NULL Record Type
Release Date
12/04/2013
Supported Platforms
mx-19.3
vmx-19.3
vsrx-19.2
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-19.4
vsrx3bsd-19.4
srx-branch-19.4
vsrx-19.4
vmx-19.4
mx-19.4
srxevo-25.4
vsrx-26.2
srx-26.2
srx-branch-26.2
vsrx3bsd-26.2
mx-12.3
srx-12.3
srx-branch-12.3
vsrx-12.3
Sigpack Version
3375
False Positive
Unknown