# Does Grok Filter is needed when we apply Logstash Arcsight module?

**URL:** <https://discuss.elastic.co/t/does-grok-filter-is-needed-when-we-apply-logstash-arcsight-module/160029>\
**Category:** Logstash\
**Created:** [December 9, 2018, 6:47am UTC](https://discuss.elastic.co/t/does-grok-filter-is-needed-when-we-apply-logstash-arcsight-module/160029 "2018-12-09T06:47:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![phongpeeradejc](https://avatars.discourse-cdn.com/v4/letter/p/838e76/32.png) [@phongpeeradejc](https://discuss.elastic.co/u/phongpeeradejc)\
**Post date:** [December 9, 2018, 6:47am UTC](https://discuss.elastic.co/t/does-grok-filter-is-needed-when-we-apply-logstash-arcsight-module/160029/1 "2018-12-09T06:47:33Z")

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I am trying to implement ELK as a SIEM as instructed [here](https://www.elastic.co/blog/integrating-elasticsearch-with-arcsight-siem-part-1), where Arcsight logs are being sent as CEF format in Logstash Arcsight module.

However, I understand that normally when the logs are parsing in Logstash, Grok Filter is needed for parsing logs into separated attributes. This is where I am not sure if this is also the case when I apply Logstash Arcsight module. Does this module be able to function as Grok Filter itself?

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 6, 2019, 7:00am UTC](https://discuss.elastic.co/t/does-grok-filter-is-needed-when-we-apply-logstash-arcsight-module/160029/2 "2019-01-06T07:00:29Z")

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