Privilege escalation with FullAccess managed policy

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Id	afb4191b-a142-4065-a0da-f721ee3d006c
Rulename	Privilege escalation with FullAccess managed policy
Description	Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy on FullAccess managed policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.
Severity	Medium
Tactics	PrivilegeEscalation
Techniques	T1484
Required data connectors	AWS
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationFullAccessManagedPolicy.yaml
Version	1.0.1
Arm template	afb4191b-a142-4065-a0da-f721ee3d006c.json

KQL

AWSCloudTrail
| where  EventName in ("AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
| where tostring(parse_json(RequestParameters).policyArn) has "FullAccess" and tostring(parse_json(RequestParameters).policyArn) !has "Admin"
| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
  AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
| project TimeGenerated, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, UserIdentityArn, ResponseElements
| extend timestamp = TimeGenerated

YAML

queryPeriod: 1d
query: |
  AWSCloudTrail
  | where  EventName in ("AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
  | where tostring(parse_json(RequestParameters).policyArn) has "FullAccess" and tostring(parse_json(RequestParameters).policyArn) !has "Admin"
  | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
  | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
  | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
  | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
  | project TimeGenerated, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, UserIdentityArn, ResponseElements
  | extend timestamp = TimeGenerated  
name: Privilege escalation with FullAccess managed policy
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
queryFrequency: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationFullAccessManagedPolicy.yaml
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
description: |
    'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy on FullAccess managed policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'
kind: Scheduled
version: 1.0.1
status: Available
severity: Medium
relevantTechniques:
- T1484
triggerOperator: gt
triggerThreshold: 0
tactics:
- PrivilegeEscalation
id: afb4191b-a142-4065-a0da-f721ee3d006c

ARM