Isai
7b2c02f69b
This rule is quite loud in telemetry. However over 80% of alerts come from a single cluster, which seems to have a lot of role usage and operation-type IAM Users which assume other roles constantly. This makes me think the majority of these alerts may be from multiple role sessions retrieving secrets, rather than a single user retrieving multiple secrets rapidly. I've looked at the prod telemetry data we have access to and found a few instances where a single secret is accessed multiple times or certain AWS services retrieve multple secrets rapidly. All of these instances have been accounted for in the tunings here. - query has been changed to remove `GetBatchSecretValue` from the query since this API call actually calls the `GetSecretValue` for each of the secrets it's retrieving. So we only need to look for `GetSecretValue` - I've added the AWS services found in prod data that contribute to rapid secret retrieval - Changed the threshold parameters to look for a single `user.id` retrieving more than 20 unique secret values (`aws.cloudtrail.request_parameters`) - updated the description and investigation guide - reduced execution window
rules/
Rules within this folder are organized by solution or platform. The structure is flattened out, because nested file hierarchies are hard to navigate and find what you're looking for. Each directory contains several .toml files, and the primary ATT&CK tactic is included in the file name when it's relevant (i.e. windows/execution_via_compiled_html_file.toml)
| folder | description |
|---|---|
. |
Root directory where rules are stored |
apm/ |
Rules that use Application Performance Monitoring (APM) data sources |
cross-platform/ |
Rules that apply to multiple platforms, such as Windows and Linux |
integrations/ |
Rules organized by Fleet integration |
linux/ |
Rules for Linux or other Unix based operating systems |
macos/ |
Rules for macOS |
ml/ |
Rules that use machine learning jobs (ML) |
network/ |
Rules that use network data sources |
promotions/ |
Rules that promote external alerts into detection engine alerts |
windows/ |
Rules for the Microsoft Windows Operating System |
Integration specific rules are stored in the integrations/ directory:
| folder | integration |
|---|---|
aws/ |
Amazon Web Services (AWS) |
azure/ |
Microsoft Azure |
cyberarkpas/ |
Cyber Ark Privileged Access Security |
endpoint/ |
Elastic Endpoint Security |
gcp/ |
Google Cloud Platform (GCP) |
google_workspace/ |
Google Workspace (formerly GSuite) |
o365/ |
Microsoft Office |
okta/ |
Oka |