Indicators added to the exclusion list are disregarded by the system, and are not created or involved in automated flows such as indicator extraction. You can still manually enrich IP addresses and URLs that are on the exclusion list, but the results are not posted to the War Room.
There are several methods by which to add indicators to the exclusion list.
Delete and Exclude Indicators
You can select one or more indicators from the Indicators table and click the Delete and Exclude button. The indicators are deleted from the Indicators table and added to the exclusion list. You can associate these indicators with one or more indicator types.
If you delete the indicator it is removed from Cortex XSOAR. This option should be used mainly for correcting errors in ingestion, and not as part of your regular work flow.
Manually Add Indicators to the Exclusion List
From the Exclusion List page, you can manually add a single indicator or define indicators using a regular expression (regex) or CIDR.
A regular expression enables you to identify a sequence of characters in an unknown string. The following example would identify www.demisto.com:
Classless inter-domain routing (CIDR) enables you to define a range of IP addresses. For example, the IPv4 block 192.168.100.0/22 represents the 1024 IPv4 addresses from 192.168.100.0 to 192.168.103.255.
Exclusion List Examples
URLs, domains, and subdomains
Excludes the top level domain (TLD), its subdomains, and URLs (http or https) on the top level domain.
Subdomain (and URLs) specifically
Excludes the given subdomain and its URLs, but the TLD is still extracted.
Specific domain only
Specifically excludes the TLD. Subdomains and URLs are still extracted.
URL with wildcards
Excludes any indicators of type URL matching the regex. Indicators example.com and examplesub.example.com of type Domain would still be extracted. Start the regex with
Excludes the given URL, but the TLD and subdomains are still extracted.
URLs, domain, and subdomains, case-insensitive, anchored to start
Excludes domain example.com, its subdomains, and its URLs. Case-insensitive. Anchors regex match to the start of the indicator value, so indicators that contain but do not start with a match (e.g., example.net?param=example.com) are not excluded.