Policy version set to default

Back


Id	874a1762-3fd7-4489-b411-6d4a9e9e8a59
Rulename	Policy version set to default
Description	An attacker with SetDefaultPolicyVersion permissions could escalate privileges through existing policy versions that are not currently in use. More about this API at https://docs.aws.amazon.com/IAM/latest/APIReference/API_SetDefaultPolicyVersion.html
Severity	Medium
Tactics	InitialAccess
Techniques	T1078
Required data connectors	AWS
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SetDefaulyPolicyVersion.yaml
Version	1.0.1
Arm template	874a1762-3fd7-4489-b411-6d4a9e9e8a59.json

KQL

AWSCloudTrail
| where EventName == "SetDefaultPolicyVersion" and isempty(ErrorCode) and isempty(ErrorMessage)
| 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]), "")
| extend timestamp = TimeGenerated

YAML

description: |
    'An attacker with SetDefaultPolicyVersion permissions could escalate privileges through existing policy versions that are not currently in use. More about this API at https://docs.aws.amazon.com/IAM/latest/APIReference/API_SetDefaultPolicyVersion.html '
kind: Scheduled
tactics:
- InitialAccess
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SetDefaulyPolicyVersion.yaml
severity: Medium
name: Policy version set to default
triggerThreshold: 0
queryPeriod: 1h
query: |
  AWSCloudTrail
  | where EventName == "SetDefaultPolicyVersion" and isempty(ErrorCode) and isempty(ErrorMessage)
  | 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]), "")
  | extend timestamp = TimeGenerated  
relevantTechniques:
- T1078
id: 874a1762-3fd7-4489-b411-6d4a9e9e8a59
queryFrequency: 1h
status: Available
triggerOperator: gt
version: 1.0.1
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
- entityType: IP
  fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address

ARM