AWSCloudTrail - User IAM Enumeration

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Id	cfaaf0bc-16d1-48df-ac8b-9d901bbd516a
Rulename	AWSCloudTrail - User IAM Enumeration
Description	Detects enumeration of IAM account configuration via repeated API calls to list roles, users, groups, and policies within a short time period. The threshold can be adjusted to reduce false positives from authorized cloud scanners such as Wiz.
Severity	Medium
Tactics	Discovery
Techniques	T1580
Required data connectors	AWS
Kind	Scheduled
Query frequency	10m
Query period	10m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_UserIAMEnumeration.yaml
Version	1.0.1
Arm template	cfaaf0bc-16d1-48df-ac8b-9d901bbd516a.json

KQL

let threshold = 50; 
AWSCloudTrail
| where EventName in ("ListAttachedRolePolicies","ListRoles","ListGroupsForUser","ListAttachedUserPolicies","ListAccessKeys","ListUsers")
| summarize
    count(),
    make_set(AWSRegion),
    make_set(UserAgent),
    make_set(SourceIpAddress),
    make_set(ErrorCode),
    make_set(ErrorMessage),
    make_set(EventName)
    by bin(TimeGenerated, 10m), UserIdentityPrincipalid, UserIdentityArn, UserIdentityAccountId
| where count_ > threshold
| mv-expand set_SourceIpAddress
| extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, ":") + 1)
| extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]

YAML

status: Available
queryFrequency: 10m
queryPeriod: 10m
triggerOperator: gt
query: |
  let threshold = 50; 
  AWSCloudTrail
  | where EventName in ("ListAttachedRolePolicies","ListRoles","ListGroupsForUser","ListAttachedUserPolicies","ListAccessKeys","ListUsers")
  | summarize
      count(),
      make_set(AWSRegion),
      make_set(UserAgent),
      make_set(SourceIpAddress),
      make_set(ErrorCode),
      make_set(ErrorMessage),
      make_set(EventName)
      by bin(TimeGenerated, 10m), UserIdentityPrincipalid, UserIdentityArn, UserIdentityAccountId
  | where count_ > threshold
  | mv-expand set_SourceIpAddress
  | extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, ":") + 1)
  | extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_UserIAMEnumeration.yaml
tactics:
- Discovery
triggerThreshold: 0
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UpnSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: set_SourceIpAddress
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
alertDetailsOverride:
  alertDescriptionFormat: User {{UserIdentityPrincipalid}} performed {{count_}} IAM enumeration API calls within a 10-minute window from account {{UserIdentityAccountId}}.
  alertDisplayNameFormat: IAM enumeration detected - {{count_}} API calls by {{UserIdentityPrincipalid}}
relevantTechniques:
- T1580
customDetails:
  PrincipalId: UserIdentityPrincipalid
  AWSAccountId: UserIdentityAccountId
  EventCount: count_
description: |
    Detects enumeration of IAM account configuration via repeated API calls to list roles, users, groups, and policies within a short time period. The threshold can be adjusted to reduce false positives from authorized cloud scanners such as Wiz.
name: AWSCloudTrail - User IAM Enumeration
version: 1.0.1
kind: Scheduled
id: cfaaf0bc-16d1-48df-ac8b-9d901bbd516a
severity: Medium

ARM