Signature Detail
This site is deprecated. Please CLICK HERE for latest updates
Short Name |
DNS:AUDIT:Z-RESERVED-OPT |
|---|---|
Severity |
Major |
Recommended |
No |
Recommended Action |
Drop |
Category |
DNS |
Keywords |
Z Option Set |
Release Date |
2012/05/10 |
Update Number |
2133 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
DNS: Z Option Set
This signature detects DNS requests that have the Z (reserved) option set. No RFC currently has a use defined for this option, therefore, its use is anomalous. Many Trojan BotNets use a pseudo-DNS format for command and control, which can trigger this signature.
References