AWSCloudTrail - Login to AWS Management Console without MFA

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Id	d25b1998-a592-4bc5-8a3a-92b39eedb1bc
Rulename	AWSCloudTrail - Login to AWS Management Console without MFA
Description	Identifies successful AWS Management Console sign-ins where CloudTrail records a ConsoleLogin event without multi-factor authentication. The rule looks for logins where MFAUsed is not Yes and the console response is not Failure, which can indicate credential misuse or weak account protection.
Severity	Low
Tactics	DefenseEvasion PrivilegeEscalation Persistence InitialAccess
Techniques	T1078
Required data connectors	AWS AWSS3
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_ConsoleLogonWithoutMFA.yaml
Version	1.0.6
Arm template	d25b1998-a592-4bc5-8a3a-92b39eedb1bc.json

KQL

AWSCloudTrail
| where EventName =~ "ConsoleLogin"
| extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin), indexId = indexof(tostring(UserIdentityPrincipalid),":")
| where MFAUsed !~ "Yes" and LoginResult !~ "Failure"
| where SessionIssuerUserName !contains "AWSReservedSSO"
| 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]), "")
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,
UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, indexId

YAML

version: 1.0.6
severity: Low
query: |
  AWSCloudTrail
  | where EventName =~ "ConsoleLogin"
  | extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin), indexId = indexof(tostring(UserIdentityPrincipalid),":")
  | where MFAUsed !~ "Yes" and LoginResult !~ "Failure"
  | where SessionIssuerUserName !contains "AWSReservedSSO"
  | 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]), "")
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,
  UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, indexId  
queryPeriod: 1d
status: Available
alertDetailsOverride:
  alertDescriptionFormat: Successful ConsoleLogin without MFA for {{AccountName}} from {{SourceIpAddress}} in account {{RecipientAccountId}}.
  alertDisplayNameFormat: 'AWS Management Console sign-in without MFA: {{AccountName}} from {{SourceIpAddress}}'
kind: Scheduled
customDetails:
  UserAgent: UserAgent
  LoginResult: LoginResult
  AWSRegion: AWSRegion
  EventName: EventName
  MFAUsed: MFAUsed
tactics:
- DefenseEvasion
- PrivilegeEscalation
- Persistence
- InitialAccess
triggerOperator: gt
queryFrequency: 1d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_ConsoleLogonWithoutMFA.yaml
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
name: AWSCloudTrail - Login to AWS Management Console without MFA
triggerThreshold: 0
description: |
  Identifies successful AWS Management Console sign-ins where CloudTrail records a ConsoleLogin event without
  multi-factor authentication. The rule looks for logins where MFAUsed is not Yes and the console response is not
  Failure, which can indicate credential misuse or weak account protection.  
id: d25b1998-a592-4bc5-8a3a-92b39eedb1bc
relevantTechniques:
- T1078
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
- connectorId: AWSS3
  dataTypes:
  - AWSCloudTrail

ARM