Comment on page
SIGMA Detection Attributes
SIGMA Detection section is the core for SIGMA rule, underlying engine interprets content of this section validates, evaluate the logic for detection. Detection Attribute is made of two parts – Search Identifiers & the Condition Attributes.
Detection Attribute Section
Search-Identifiers represent ‘what an analyst would want to search for’ on the given log data. A SIGMA rule can contain a single or multiple search-identifiers. Search-Identifier are up made of LISTS or MAPS, where “LISTS” contain a list of values (elements) and "MAPS" (Key-Value pair) that includes Event-IDs, Values, Strings.
- LISTS are often represented with a "–" dash bullet implying logical "OR", Selection can have any number of elements in a list, all are joined with logical 'OR'.
- MAPS are Key-Value pairs, where 'Key' is the field name of the log data, and 'Value' is the data (string/integer) value in given log data, Selection can have any number of Key-Value pairs, all are joined with logical 'AND'
Value Modifiers can be used to modify values in a rule, Value Modifiers can change search-identifier behavior and are attached to the end of a field name after the pipe “|” character.
Condition Attributes uses logical operators to link elements in Search-Identifiers together, defining how the detection engine will process each search-identifiers in relation to others. Search-Identifiers can be grouped using parenthesis — e.g. (selection1 and selection2) or selection3, Condition attribute supports the following expressions to link and evaluate search-identifiers: