rules/windows/sysmon/sysmon_abusing_azure_browser_sso.yml

title: Avusing Azure Browser SSO
id: 50f852e6-af22-4c78-9ede-42ef36aa3453
description: Detects abusing  Azure Browser SSO by requesting  OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user.
author: Den Iuzvyk
reference:
   - https://posts.specterops.io/requesting-azure-ad-request-tokens-on-azure-ad-joined-machines-for-browser-sso-2b0409caad30
date: 2020/07/15
modified: 2020/08/26
logsource:
   category: sysmon
   product: windows
status: experimental
tags:
   - attack.defense_evasion
   - attack.privilege_escalation
   - attack.t1073          # an old one
   - attack.t1574.002
detection:
   condition: selection_dll and not filter_legit
   selection_dll:
      EventID: 7
      ImageLoaded|endswith: MicrosoftAccountTokenProvider.dll
   filter_legit:
      Image|endswith:
         - BackgroundTaskHost.exe
         - devenv.exe
         - iexplore.exe
         - MicrosoftEdge.exe
falsepositives:
   - unknown
level: high
Create sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:02:34 +03:00			`title: Avusing Azure Browser SSO`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`id: 50f852e6-af22-4c78-9ede-42ef36aa3453`
Create sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:02:34 +03:00			`description: Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user.`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`author: Den Iuzvyk`
Create sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:02:34 +03:00			`reference:`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`- https://posts.specterops.io/requesting-azure-ad-request-tokens-on-azure-ad-joined-machines-for-browser-sso-2b0409caad30`
Update sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:24:49 +03:00			`date: 2020/07/15`
review windows/sysmon 2020-08-29 02:03:28 +02:00			`modified: 2020/08/26`
Create sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:02:34 +03:00			`logsource:`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`category: sysmon`
			`product: windows`
Create sysmon_abusing_azure_browser_sso.yml 2020-07-15 14:02:34 +03:00			`status: experimental`
			`tags:`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`- attack.defense_evasion`
			`- attack.privilege_escalation`
review windows/sysmon 2020-08-29 02:03:28 +02:00			`- attack.t1073 # an old one`
			`- attack.t1574.002`
reordered fields, changed indentation 2020-08-12 16:44:37 +02:00			`detection:`
			`condition: selection_dll and not filter_legit`
			`selection_dll:`
			`EventID: 7`
			`ImageLoaded\|endswith: MicrosoftAccountTokenProvider.dll`
			`filter_legit:`
			`Image\|endswith:`
			`- BackgroundTaskHost.exe`
			`- devenv.exe`
			`- iexplore.exe`
			`- MicrosoftEdge.exe`
			`falsepositives:`
			`- unknown`
			`level: high`