Lookup definition provides matching rules for a lookup file.Downloading Splunk App for Lookup File Editing | lookup botnet_ip.csv dst_ip AS dst OUTPUT c2_status AS "C2 Server Status", malware AS "Malware Family" Copy src It is also possible to rename lookup destination fields. | lookup botnet_ip.csv dst_ip AS dst OUTPUT c2_status, malware Copy src Another way to understand the difference is that inputlookup performs inner join while lookup performs left outer join where the event data is the left table and the lookup file is the right table.ĭespite their difference, it can be useful to use both at the same time to enrich filtered event data, even when using the same lookup file. lookup enriches the event data by appending new fields to the rows with matching field values. When using as a subsearch, inputlookup filters the event data and only outputs rows with matching values of specified field(s). index=firewall Copy srcĮmerging Threats: Known Compromised Hosts To explicitly use lookup fields for CIDR-matching, use lookup and lookup definition.
However, this behaviour is on best-effort basis and may not work as intended. Splunk automatically detects CIDR-like value in a lookup file and performs CIDR-matching accordingly. If case-sensitive matching is required, use lookup and lookup definition. The syntax is the same as what was shown in the previous section because Splunk will only match non-empty values, empty values will be ignored instead. Matching individual and multiple fields §Ī lookup file may have rows with empty path to denote a domain should be blocked regardless of paths, while also having rows with both domain and path to denote a specific URL should be blocked instead. | inputlookup urlhaus-filter-splunk-online.csv Copy host When specifying more than one field in fields command, all fields will be matched using AND condition. For those sites, the lookup should match both domain and path. index=proxy Copy srcįile hosting services like Google Docs and Dropbox are commonly abused to host phishing website. Wildcard also works as a prefix (“*foo.com”) or even in the middle (“f*o.com”), though these are discouraged. Previous section showed an example using wildcard suffix (“foo.com*“). | outputlookup override_if_empty=false urlhaus-filter-splunk-online.csv Copy host
Those commands has wildcard_suffix argument to append wildcard to the field’s values.
#SPLUNK LOOKUP TABLE EMPTY ROWS UPDATE#
The add-on includes geturlhausfilter command along with other commands to update their respective lookup file. Urlhaus-filter malicious website detected The lookup files do not include wildcard affix. To display events in table format, append | table * Wildcard §Īsterisk character ( *) in the lookup file does work as a wildcard. In this example, the subsearch extracts only the dst_ip field and rename it to dst in order to match the same field in the firewall events. To match for dst value of the firewall events and dst_ip of the lookup file, use a subsearch with inputlookup. Notice the second row’s dst value matches dst_port value of the example lookup table shown in the previous section. | inputlookup botnet_ip.csv | fields dst_ip | rename dst_ip AS dst Copy dstĮxample firewall events: index=firewall Copy src The output is no different to any other event, we can specify which fields to be displayed and then rename the fields. inputlookup basics § | inputlookup botnet_ip.csv Copy Uploaded lookup file can be used straight away without having to reload app or restart Splunk, regardless of which way it was created. In Splunk Web, setting the permission to app-sharing or global-sharing will automatically moves the file to the second or third location respectively.
Lookup file can be uploaded via Splunk Web or creating the file in the following locations: When using that command, there should always be a leading pipe character “|” because it is an event-generating command. We can view the content of a lookup file by using inputlookup. They contain a list of bad IPs/domains/URLs and we are going to look for those values in the events. These CSV files can be used as lookups to find potentially malicious traffic. Splunk Add-on for malware-filter includes the following CSV files:
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