name: AWS Successful Single-Factor Authentication
id: a520b1fe-cc9e-4f56-b762-18354594c52f
version: 1
date: '2022-10-04'
author: Bhavin Patel, Splunk
type: TTP
datamodel:
- Endpoint
description: The following analytic identifies a successful Console Login authentication event against an AWS IAM user for an account without Multi-Factor Authentication enabled. This could be evidence of a misconfiguration, a policy violation or an account take over attempt that should be investigated
search: '`cloudtrail` eventName= ConsoleLogin errorCode=success "additionalEventData.MFAUsed"=No | stats count min(_time) as firstTime max(_time) as lastTime by src eventName eventSource aws_account_id errorCode additionalEventData.MFAUsed userAgent eventID awsRegion user_name userIdentity.arn | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)` | `aws_successful_single_factor_authentication_filter`'
how_to_implement: The Splunk AWS Add-on is required to utilize this data. The search requires AWS Cloudtrail logs.
known_false_positives: It is possible that some accounts do not have MFA enabled for the AWS account however its agaisnt the best practices of securing AWS. 
references:
- https://attack.mitre.org/techniques/T1621/
- https://attack.mitre.org/techniques/T1078/004/
- https://aws.amazon.com/what-is/mfa/
tags:
  analytic_story:
  - AWS Identity and Access Management Account Takeover
  asset_type: AWS Account
  cis20:
  - CIS 3
  - CIS 5
  - CIS 16
  confidence: 80
  context:
  - Source:Cloud Data
  dataset:
  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078.004/aws_login_sfa/cloudtrail.json
  impact: 80
  kill_chain_phases:
  - Exploitation
  message: User $user_name$ has successfully logged into an AWS Console without Multi-Factor Authentication from $src$
  mitre_attack_id:
  - T1586
  - T1586.003
  - T1078
  - T1078.004
  nist:
  - DE.CM
  observable:
  - name: user_name
    type: User
    role:
    - Victim
  - name: src
    type: IP Address
    role:
    - Attacker
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  required_fields:
  - src 
  - eventName 
  - eventSource 
  - aws_account_id 
  - errorCode 
  - additionalEventData.MFAUsed
  - userAgent 
  - eventID 
  - awsRegion
  - user_name 
  - userIdentity.arn 
  risk_score: 64
  security_domain: threat