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Create custom rules using the Assisted rule creator
The Assisted rule creator option helps you create the Agent and dependent detection rules together, and ensures that the Agent rule is referenced in the detection rules. Using this tool is faster than the advanced method of creating the Agent and detection rules separately.
Cloud Security Management Threats (CSM Threats) first evaluates activity within the Datadog Agent against Agent expressions to decide what activity to collect. This portion of a CSM Threats rule is called the Agent expression. Agent expressions use Datadog’s Security Language (SECL). The standard format of a SECL expression is as follows:
SECL operators are used to combine event attributes together into a full expression. The following operators are available:
SECL Operator
Types
Definition
Agent Version
==
Process
Equal
7.27
!=
File
Not equal
7.27
>
File
Greater
7.27
>=
File
Greater or equal
7.27
<
File
Lesser
7.27
<=
File
Lesser or equal
7.27
!
File
Not
7.27
^
File
Binary not
7.27
in [elem1, ...]
File
Element is contained in list
7.27
not in [elem1, ...]
File
Element is not contained in list
7.27
=~
File
String matching
7.27
!~
File
String not matching
7.27
&
File
Binary and
7.27
|
File
Binary or
7.27
&&
File
Logical and
7.27
||
File
Logical or
7.27
in CIDR
Network
Element is in the IP range
7.37
not in CIDR
Network
Element is not in the IP range
7.37
allin CIDR
Network
All the elements are in the IP range
7.37
in [CIDR1, ...]
Network
Element is in the IP ranges
7.37
not in [CIDR1, ...]
Network
Element is not in the IP ranges
7.37
allin [CIDR1, ...]
Network
All the elements are in the IP ranges
7.37
Patterns and regular expressions
Patterns or regular expressions can be used in SECL expressions. They can be used with the in, not in, =~, and !~ operators.
Format
Example
Supported Fields
Agent Version
~"pattern"
~"httpd.*"
All
7.27
r"regexp"
r"rc[0-9]+"
All except .path
7.27
Patterns on .path fields will be used as Glob. * will match files and folders at the same level. **, introduced in 7.34, can be used at the end of a path in order to match all the files and subfolders.
Duration
You can use SECL to write rules based on durations, which trigger on events that occur during a specific time period. For example, trigger on an event where a secret file is accessed more than a certain length of time after a process is created.
Such a rule could be written as follows:
