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Different log types will often contain different fields, and event fields with the same names may be formatted slightly differently. Windows uses numeric identifiers for the field EVENTID (eg: 512, 4593), whereas Solaris and Linux will use more descriptive terms such as “login - ftp”. DATE and TIME fields, though stored in the format YYYY-MM-DD and HH:MM:SS respectively within the Snare Central data store, can support indirect values such as “this time last week” or “the first day of this month”, or “last saturday”, or “5” (which translates to ‘now minus 5 days’, in the case of DATE, or ‘now minus 5 secondsminutes’ in the case of TIME) . |
In addition, some functions are available that can modify field contents.
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The REGEX operators (REGEX, !REGEX, REGEXI, !REGEXI) have a range of reserved characters that represent particular features within a regular expression. These characters must be escaped with the backslash character (\) when used as a literal value, in most instances.
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reserved characters that represent particular features within a regular expression. These characters must be escaped with the backslash character (\) when used as a literal value, in most instances.
Special Case Values - DATE
Date recognition is flexible in SnareStore. The following date formats are recognised, using the associated operators text in italics is optional
Format | Valid Operators | Details |
|---|---|---|
YYYY-MM-DD | All | eg: DATE = 2017-06-23 |
TODAY | =,<,<=,>,>=,!= | The date on which the query was run |
NOW | =,<,<=,>,>=,!= | The date on which the query was run |
YESTERDAY | =,<,<=,>,>=,!= | The day prior |
TOMORROW | =,<,<=,>,>=,!= | The day after |
N | =,<,<=,>,>=,!= | Translates to "Current date/time minus N days" (for DATE) or "Current time minus N minutes" (for TIME). |
THIS TIME LAST WEEK | =,<,<=,>,>=,!= | The week prior |
THIS TIME NEXT WEEK | =,<,<=,>,>=,!= | The week after |
THIS TIME LAST YEAR | =,<,<=,>,>=,!= | The same date as the current date, one year prior |
THIS TIME NEXT YEAR | =,<,<=,>,>=,!= | The same date as the current date, one year after |
THE DAY AFTER TOMORROW | =,<,<=,>,>=,!= | Today + 2 days |
THE DAY BEFORE YESTERDAY | =,<,<=,>,>=,!= | Today - 2 days |
1ST OF THIS MONTH | =,<,<=,>,>=,!= | The first day of the month on which the query is run |
LAST OF THIS MONTH | =,<,<=,>,>=,!= | The last day of the month on which the query is run |
1ST OF LAST MONTH | =,<,<=,>,>=,!= | The first day of the previous month |
LAST OF LAST MONTH | =,<,<=,>,>=,!= | The last day of the previous month |
FIRST OF THE MONTH | =,!= | The first day of ANY month |
LAST MONDAY | =,<,<=,>,>=,!= | The date of the last supplied day |
NEXT MONDAY | =,<,<=,>,>=,!= | The date of the next supplied day |
MONDAY LAST WEEK | =,<,<=,>,>=,!= | The date associated with the supplied day. |
MONDAY NEXT WEEK | =,<,<=,>,>=,!= | The date associated with the supplied day. |
HH:MM:SS | =,<,<=,>,>=,!= | Take the number of hours, minutes and seconds supplied, add it to the local midnight (00:00:00) for the current date, and use the resulting date as a source. eg: 03:00:00, 17:00:00, and 23:59:59 would all result in the equivalent of NOW or TODAY eg: 25:00:00 would be the equivalent of TOMORROW eg: -01:00:00 would be the equivalent of YESTERDAY eg: 240:00:00 would be the equivalent of 10 days from now. |
THIS WEEK | <,<=,>,>=,=,!= | If the date is within the current week. Monday is assumed to be the first day of the week. |
LAST WEEK | <,<=,>,>=,=,!= | If the date is within last weeks range. Monday is assumed to be the first day of this week. |
NEXT WEEK | <,<=,>,>=,=,!= | If the date is within next weeks range. Monday is assumed to be the first day of next week. |
THIS YEAR | <,<=,>,>=,=,!= | If the date is within the current year. |
LAST YEAR | <,<=,>,>=,=,!= | If the date is in last years date range. |
NEXT YEAR | <,<=,>,>=,=,!= | If the date is within next years date range |
MONDAY | =,!= | If the date falls on the value supplied |
WEEKDAY | =,!= | If the date is a weekday |
WEEKEND | =,!= | If the date is a weekend |
FIRST OF THE YEAR | =,!= | If the date is the first day of any year (ie: January 1) |
JANUARY | =,!= | If the date is found within the specified month |
Reference
Component | Description | Reference |
|---|---|---|
Field | A field in SnareQL is a word that represents a field within a particular log type. | Events within each logtype are guaranteed by the Snare Central collection subsystem to include the following fields:
Depending on the source log type, events may also include fields such as:
The fields available for each type of log are detailed in a table below. Note that new log types are added on a regular basis. |
Operator | An operator in SnareQL is one or more symbols or words that compare the value of a field on its left with one or more values on its right. Some operators may use the negate symbol (!) to reverse the meaning - eg: !=, !REGEX |
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Logical Element | A logical element in SnareQL is a word that joins two or more clauses together to forma a complex SnareQL query |
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Value | A string designed to represent the contents of a field in an event within the Snare Central datastore. The value may be a simple string, or a complex regular expression, depending on the operator selected. Quotations are optional for simple values comprising a single word. Single or double quotes are recommended for more complex values such as regular expressions, and are required for strings that contain whitespace. |
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Function | A function in SnareQL appears as a word followed by parentheses, which may contain a field. A function performs a calculation on the contents of the field (the value) and returns the results. |
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