↳ GitHub sourceAnalytics ruleMedium
AWSCloudTrail - S3 Object Exfiltration from Anonymous User
Description
Detects S3 GetObject activity performed by anonymous principals, which can indicate unauthorized object access
and potential data exfiltration from public or misconfigured buckets.
- Rule type
- Scheduled
- Version
- 1.0.1
- Declared status
- Available
- Query frequency
- 5m
- Query period
- 5m
- Trigger
- gt 0
Declared MITRE coverage
Declared sources
Metadata from the source file. No dependencies inferred from KQL.
Connectors
Data types
KQL query
Original query, unchanged.
AWSCloudTrail
| where ((UserIdentityAccountId =~ @'ANONYMOUS_PRINCIPAL' or UserIdentityPrincipalid == "Anonymous") and EventName == 'GetObject')
| extend
BucketName = parse_json(RequestParameters).bucketName,
ObjectKey = parse_json(RequestParameters).key
| extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, ":") + 1)
| extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]
Declared entities
Related content
Links established from declared identifiers and solution manifests.
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
9800e51↗- Source identifier
15d3bf4e-8708-41c8-a836-8b0aa5be730e
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC