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Downloading Imperva Incapsula SIEMIntegration (WAF) and Attack Analytics Add-on (CEF)
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Imperva Incapsula SIEMIntegration (WAF) and Attack Analytics Add-on (CEF)

Splunk AppInspect Passed
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Overview
Details
Parse Imperva Incapsula WAF to Network Traffic, Web/Proxy, and IDS Data Models

Set initial sourcetype to "imperva" to allow future flexibility to sub-sourcetype to specific eventtypes and formats

Currently recognizes Incapsula CloudWAF and Attack Analytics logs

Basic parser for Imperva Incapsula and Attack Analytics

-In your inputs.conf, you should set the following in your monitor:// stanza
    sourcetype=incapsula

-Install this App on the Index/HF tier (timestamp, event breaks, and sub-sourcetyping) as well as SH where CIM compliance is required

    Incapsula WAF data should get detected as incapsula:cef
        This data has been normalized to IDS, Network_Traffic, and Web Data Models

    Attack Analytics should get detected as imperva:aa:cef
        This data has been normalized to the Alerts DM

Troubleshooting:

1. All events receiving sourcetype=incapsula (not being sub sourcetyped).
    a. Ensure you installed the TA on the Indexer or HF that processes the events

    b. Validate source data is supported. This addon supports "Incapsula SIEMintegration" and "Imperva Inc Attack Analytics" sourcetypes in the CEF format.

2. Events with missing action=value.  If you have any events matching this search "sourcetype=incapsula:cef act=* NOT action=*", the values from act=* will need to be added to lookups/imperva_vendor_act.csv.  If this happens to you, please send me the act=values so I can update the lookup for everyone!

3. Data being truncated.  Many of the WAF events are quite long, and you likely need to increase the default truncation limit from 10000 to a size large enough to support your data.  If you do have larger events, you should add a local/props.conf with the following

[incapsula:cef]
#set this large a little higher than your largest event and periodically monitor if it is sufficient.
TRUNCATE = 10000

This search can help you identify sourcetypes that get truncated due to truncation limits that are too low
    index=_internal sourcetype=splunkd component=LineBreakingProcessor | extract | rex "because\slimit\sof\s(?<limit>\S+).*>=\s(?<actual>\S+)" | stats count avg(actual) max(actual) dc(data_source) dc(data_host) BY data_sourcetype, limit | eval avg(actual)=round('avg(actual)') | sort - count

Release Notes

Version 1.0.8
Aug. 5, 2020

Version 1.0.8
Fixing file permissions to pass App Inspect

Version 1.0.6
Make sure your events aren't being truncated!


May need to increase "TRUNCATE = 10000" (defaults) to a higher value. This search can help you identify data that is being truncated.
index=_internal sourcetype=splunkd component=LineBreakingProcessor | extract | rex "because\slimit\sof\s(?<limit>\S+).*>=\s(?<actual>\S+)" | stats count avg(actual) max(actual) dc(data_source) dc(data_host) BY data_sourcetype, limit | eval avg(actual)=round('avg(actual)') | sort - count

Fixed compatibility with Network Traffic DM (update tags.conf from "traffic = true" to "communicate = true".

Added additional action evals. If you find any other events with "act=* AND NOT action=*" please let me know. The values from "act=" will need to be added to the lookup "imperva_vendor_act.csv".

Added an additional transform to null queue "blank" events, where the event only contains the header with no message data.

Version 1.0.5
July 28, 2020

Fixed REPORT regex for Rule_name extraction. Updated signature evals to cover more events.

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