Signature Detail
Short Name |
DNS:AUDIT:UNASSIGNED-OPCODE |
|---|---|
Severity |
High |
Recommended |
Yes |
Recommended Action |
Drop |
Category |
DNS |
Keywords |
KAZY BotNet C&C |
Release Date |
2012/05/10 |
Update Number |
2133 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
DNS: Unassigned Opcode
This signature detects DNS requests that use an unassigned opcode. No RFC currently has a use defined for these opcodes, therefore, their use is anomalous. Many Trojan BotNets use a pseudo-DNS format for command and control, which can trigger this signature
References