Techniques
Sample rules
AWS Excessive Security Scanning
- source: splunk
- technicques:
- T1526
Description
The following analytic identifies excessive security scanning activities in AWS by detecting a high number of Describe, List, or Get API calls from a single user. It leverages AWS CloudTrail logs to count distinct event names and flags users with more than 50 such events. This behavior is significant as it may indicate reconnaissance activities by an attacker attempting to map out your AWS environment. If confirmed malicious, this could lead to unauthorized access, data exfiltration, or further exploitation of your cloud infrastructure.
Detection logic
`cloudtrail` eventName=Describe* OR eventName=List* OR eventName=Get*
| fillnull
| rename user_name as user
| stats dc(signature) as dc_events min(_time) as firstTime max(_time) as lastTime values(signature) as signature values(dest) as dest values(user_agent) as user_agent values(src) as src values(vendor_account) as vendor_account values(vendor_region) as vendor_region by user
| where dc_events > 50
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
|`aws_excessive_security_scanning_filter`