sigmamediumHunting

AWS STS GetCallerIdentity Enumeration Via TruffleHog

Detects the use of TruffleHog for AWS credential validation by identifying GetCallerIdentity API calls where the userAgent indicates TruffleHog. Threat actors leverage TruffleHog to enumerate and validate exposed AWS keys. Successful exploitation allows threat actors to confirm the validity of compromised AWS credentials, facilitating further unauthorized access and actions within the AWS environment.

MITRE ATT&CK

T1087.004

discovery

Detection Query

selection:
  eventSource: sts.amazonaws.com
  eventName: GetCallerIdentity
  userAgent|contains: TruffleHog
condition: selection

Author

Adan Alvarez @adanalvarez

Created

2025-10-12

Data Sources

awscloudtrail

Platforms

aws

References

Tags

attack.discoveryattack.t1087.004

Raw Content

title: AWS STS GetCallerIdentity Enumeration Via TruffleHog
id: 9b1b8e9b-0a5d-4af1-9d2f-4c4b6e7c2c9d
status: experimental
description: |
    Detects the use of TruffleHog for AWS credential validation by identifying GetCallerIdentity API calls where the userAgent indicates TruffleHog.
    Threat actors leverage TruffleHog to enumerate and validate exposed AWS keys.
    Successful exploitation allows threat actors to confirm the validity of compromised AWS credentials, facilitating further unauthorized access and actions within the AWS environment.
references:
    - https://www.rapid7.com/blog/post/tr-crimson-collective-a-new-threat-group-observed-operating-in-the-cloud/
    - https://docs.aws.amazon.com/STS/latest/APIReference/API_GetCallerIdentity.html
    - https://github.com/trufflesecurity/trufflehog
author: Adan Alvarez @adanalvarez
date: 2025-10-12
tags:
    - attack.discovery
    - attack.t1087.004
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource: 'sts.amazonaws.com'
        eventName: 'GetCallerIdentity'
        userAgent|contains: 'TruffleHog'
    condition: selection
falsepositives:
    - Legitimate internal security scanning or key validation that intentionally uses TruffleHog. Authorize and filter known scanner roles, IP ranges, or assumed roles as needed.
level: medium