imperva/cloud-waf
| Vendor | Imperva, Inc. |
| Author | CrowdStrike |
| Version | 1.1.0 |
| Minimum LogScale Version | 1.120.0 |
Web application attacks prevent important transactions and steal sensitive data.
Imperva Cloud Web Application Firewall (WAF) stops these attacks with near-zero false positives and a global SOC to ensure your organization is protected from the latest attacks minutes after they are discovered in the wild.
The parser normalizes data to a common schema based on CrowdStrike Parsing Standard (CPS) 1.0. This schema allows you to search the data without knowing the data specifically, and just knowing the common schema instead. It also allows you to combine the data more easily with other data sources which conform to the same schema.
Breaking Changes
This update includes parser changes, which means that data ingested after upgrade will not be backwards compatible with logs ingested with the previous version.
Updating to version 1.0.0 or newer will therefore result in issues with existing queries in for example dashboards or alerts created prior to this version.
See CrowdStrike Parsing Standard (CPS) 1.0 for more details on the new parser schema.
Follow the CPS Migration to update your queries to use the fields and tags that are available in data parsed with version 1.0.0.
Installing the Package in LogScale
Find the repository where you want to send the events, or Creating a Repository or View.
Navigate to your repository in the LogScale interface, click Settings and then on the left.
Click and install the LogScale package for (i.e. imperva/cloud-waf).
Configurations and Sending the Logs to LogScale
First you need to configure Imperva Cloud WAF log integration. The preferred option for sending logs from Imperva to LogScale is to choose
Push ModetoAmazon S3.Once this configuration is completed, your logs will be automatically transferred from the Imperva cloud repository to your pre-defined AWS S3 bucket.
Then you need to configure LogScale to collect data from AWS S3 buckets using the cwaf-cef. See the documentation for cloud: Ingest Data from AWS S3 and self-hosted Ingest Data from AWS S3 deployments to send logs directly from S3 bucket into LogScale repository.
Refer to Imperva log file structure to get additional details about recorded events.
Verify Data is Arriving in LogScale
Once you have completed the above steps the data should be arriving in your LogScale repository.
You can verify this by doing a simple search for to see the events:
#Vendor = "imperva"
| #event.module="cloud-waf"Package Contents Explained
This package parses incoming data, and normalizing the data as part of that parsing. The parser normalizes the data to CrowdStrike Parsing Standard (CPS) 1.0 schema based on OpenTelemetry standards, while still preserving the original data.
If you want to search using the original field names and values, you can access those in the fields whose names are prefixed with the word Vendor. Fields which are not prefixed with Vendor are standard fields which are either based on the schema (e.g. source.ip) or on LogScale conventions (e.g. @rawstring).
The fields which the parser currently maps the data to, are chosen based on what seems the most relevant, and will potentially be expanded in the future. But the parser won't necessarily normalize every field that has potential to be normalized.
Event Categorisation
As part of the schema, events are categorized by fields:
For example, the following will find events where some
event.type[n] field contains the value
network, regardless of what n
is.
Note that not all events will be categorized to this level of detail.
Normalized Fields
Here are some of the normalized fields which are being set by this parser:
Next Steps and Use Cases
You can get actionable insights from your Imperva Web Application Framework by searching for suspicious activity in LogScale using the search UI, dashboards or alerts.