Once installed, the next step is to create YARA rules; these rules can be generic or very specific, and they can be created using any text editor. To understand the YARA rule syntax, let's take an example of a simple YARA rule that looks for suspicious strings in any file, as follows:
rule suspicious_strings{ strings: $a = "Synflooding" $b = "Portscanner" $c = "Keylogger"condition: ($a or $b or $c)}
The YARA rule consists of the following components:
- Rule identifier: This is a name that describes the rule (suspicious_strings in the preceding example). The rule identifiers can contain any alphanumeric character and the underscore character, but the first character cannot be a digit. The rule identifiers are case-sensitive ...
