User IAM Enumeration

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Id	cfaaf0bc-16d1-48df-ac8b-9d901bbd516a
Rulename	User IAM Enumeration
Description	Detects enumeration of accounts configuration via api call to list different instances and services within a short period of time. WL Scanner of Cloud Account such as Wiz and threshold can be adjusted
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	1.0.0
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

queryPeriod: 10m
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]  
name: User IAM Enumeration
entityMappings:
- fieldMappings:
  - columnName: Name
    identifier: Name
  - columnName: UpnSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: set_SourceIpAddress
    identifier: Address
  entityType: IP
queryFrequency: 10m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_UserIAMEnumeration.yaml
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
description: |
    'Detects enumeration of accounts configuration via api call to list different instances and services within a short period of time. WL Scanner of Cloud Account such as Wiz and threshold can be adjusted'
kind: Scheduled
version: 1.0.0
status: Available
severity: Medium
relevantTechniques:
- T1580
triggerOperator: gt
triggerThreshold: 0
tactics:
- Discovery
id: cfaaf0bc-16d1-48df-ac8b-9d901bbd516a

ARM