AWS S3 Static Site JavaScript File Uploaded

from logs-aws.cloudtrail* metadata _id, _version, _index
| where
    // S3 object write activity
    data_stream.dataset == "aws.cloudtrail"
    and event.provider == "s3.amazonaws.com"
    and event.action == "PutObject"
    and event.outcome == "success"

    // IAM users or assumed roles only
    and aws.cloudtrail.user_identity.type in ("IAMUser", "AssumedRole")

    // Requests for static site bundles
    and aws.cloudtrail.request_parameters like "*static/js/*.js*"

    // Exclude IaC and automation tools
    and not (
        user_agent.original like "*Terraform*"
        or user_agent.original like "*Ansible*"
        or user_agent.original like "*Pulumi*"
    )

// Extract fields from request parameters
| dissect aws.cloudtrail.request_parameters
    "%{{?bucket.name.key}=%{Esql.aws_cloudtrail_request_parameters_bucket_name}, %{?host.key}=%{Esql_priv.aws_cloudtrail_request_parameters_host}, %{?bucket.object.location.key}=%{Esql.aws_cloudtrail_request_parameters_bucket_object_location}}"

// Extract file name portion from full object path
| dissect Esql.aws_cloudtrail_request_parameters_bucket_object_location "%{}static/js/%{Esql.aws_cloudtrail_request_parameters_object_key}"

// Match on JavaScript files
| where ends_with(Esql.aws_cloudtrail_request_parameters_object_key, ".js")

// Retain relevant ECS and dissected fields
| keep
    aws.cloudtrail.user_identity.arn,
    aws.cloudtrail.user_identity.access_key_id,
    aws.cloudtrail.user_identity.type,
    aws.cloudtrail.request_parameters,
    Esql.aws_cloudtrail_request_parameters_bucket_name,
    Esql.aws_cloudtrail_request_parameters_object_key,
    user_agent.original,
    source.ip,
    event.action,
    @timestamp,
    _id,
    _version,
    _index

False Positives

• ⚠ Development or deployment pipelines that update static frontends frequently (e.g., React/Vue apps) may trigger this. Verify the user agent, source IP, and whether the modification was expected.