AWSCloudTrail - NRT Login to AWS Management Console without MFA

Status: available
Severity: low
Group by: AWSRegion, AccountName, AccountUPNSuffix, EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, SessionMfaAuthenticated, SourceIpAddress, UserAgent, UserIdentityAccountId, UserIdentityPrincipalid, UserIdentityUserName
Source: github.com/Azure/Azure-Sentinel

Multi-Factor Authentication (MFA) helps you to prevent credential compromise. This alert identifies logins to the AWS Management Console without MFA. You can limit this detection to trigger for administrative accounts if you do not have MFA enabled on all accounts. This is done by looking at the eventName ConsoleLogin and if the AdditionalEventData field indicates MFA was NOT used and the ResponseElements field indicates NOT a Failure. Thereby indicating that a non-MFA login was successful.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1078` Valid Accounts
Persistence	`T1078` Valid Accounts
Privilege Escalation	`T1078` Valid Accounts
Stealth	`T1078` Valid Accounts

Telemetry coverage

Platform	Record / event type
AWS	CloudTrail event `ConsoleLogin`: Records an authentication attempt to the AWS Management Console, including whether it succeeded or failed.

Rules detecting the same action

These rules filter on the same operation.

AWS Console Login (Panther)
AWS Console Login Failed During MFA Challenge (Splunk)
AWS ConsoleLogin Failed Authentication (Sigma)
AWS CreateLoginProfile (Splunk)
AWS Credential Access Failed Login (Splunk)
AWS High Number Of Failed Authentications For User (Splunk)
AWS High Number Of Failed Authentications From Ip (Splunk)
AWS Multiple Failed MFA Requests For User (Splunk)

Rule body

id: 0ee2aafb-4500-4e36-bcb1-e90eec2f0b9b
name: AWSCloudTrail - NRT Login to AWS Management Console without MFA
description: |
  'Multi-Factor Authentication (MFA) helps you to prevent credential compromise. This alert identifies logins to the AWS Management Console without MFA.
  You can limit this detection to trigger for administrative accounts if you do not have MFA enabled on all accounts.
  This is done by looking at the eventName ConsoleLogin and if the AdditionalEventData field indicates MFA was NOT used and the ResponseElements field indicates NOT a Failure. Thereby indicating that a non-MFA login was successful.'
severity: Low
status: Available
requiredDataConnectors:
  - connectorId: AWS
    dataTypes:
      - AWSCloudTrail
  - connectorId: AWSS3
    dataTypes:
      - AWSCloudTrail
tactics:
  - DefenseEvasion
  - PrivilegeEscalation
  - Persistence
  - InitialAccess
relevantTechniques:
  - T1078
query: |
  AWSCloudTrail
  | where EventName =~ "ConsoleLogin"
  | extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin)
  | 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
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: AccountUPNSuffix
      - identifier: CloudAppAccountId
        columnName: RecipientAccountId
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: SourceIpAddress
version: 1.0.4
kind: NRT

Stages and Predicates

Stage 1: `source`

AWSCloudTrail

Stage 2: `where`

| where EventName =~ "ConsoleLogin"

Stage 3: `extend`

| extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin)

Stage 4: `where`

| where MFAUsed !~ "Yes" and LoginResult !~ "Failure"

Stage 5: `where`

| where SessionIssuerUserName !contains "AWSReservedSSO"

Stage 6: `extend` (4 consecutive steps)

| 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]), "")

Stage 7: `summarize`

| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,
  UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion

Exclusions

The rule actively suppresses these predicates.

Field	Kind	Excluded values	Search
`SessionIssuerUserName`	contains	`AWSReservedSSO`	`excludes:SessionIssuerUserName` `field:"SessionIssuerUserName" value:"AWSReservedSSO"`

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`EventName`	eq	`ConsoleLogin`	`field:"aws::eventName" kind:eq value:"ConsoleLogin"`
`LoginResult`	ne	`Failure`	`field:"LoginResult" kind:ne value:"Failure"`
`MFAUsed`	ne	`Yes`	`field:"MFAUsed" kind:ne value:"Yes"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`AWSRegion`	`summarize`
`AccountName`	`summarize`
`AccountUPNSuffix`	`summarize`
`EndTimeUtc`	`summarize`
`EventName`	`summarize`
`EventTypeName`	`summarize`
`LoginResult`	`summarize`
`MFAUsed`	`summarize`
`RecipientAccountId`	`summarize`
`SessionMfaAuthenticated`	`summarize`
`SourceIpAddress`	`summarize`
`StartTimeUtc`	`summarize`
`UserAgent`	`summarize`
`UserIdentityAccountId`	`summarize`
`UserIdentityPrincipalid`	`summarize`
`UserIdentityUserName`	`summarize`

AWSCloudTrail - NRT Login to AWS Management Console without MFA

MITRE ATT&CK coverage

Telemetry coverage

Rules detecting the same action

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: where

Stage 5: where

Stage 6: extend (4 consecutive steps)

Stage 7: summarize