43 lines
1.4 KiB
YAML
43 lines
1.4 KiB
YAML
title: Abusing Azure Browser SSO
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author: Den Iuzvyk
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date: 2020/07/15
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description: Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens
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for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure
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AD and a user logs in with their Azure AD account) wanting to perform SSO authentication
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in the browser. An attacker can use this to authenticate to Azure AD in a browser
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as that user.
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detection:
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SELECTION_1:
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EventID: 7
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SELECTION_2:
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ImageLoaded: '*MicrosoftAccountTokenProvider.dll'
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SELECTION_3:
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Image: '*BackgroundTaskHost.exe'
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SELECTION_4:
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Image: '*devenv.exe'
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SELECTION_5:
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Image: '*iexplore.exe'
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SELECTION_6:
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Image: '*MicrosoftEdge.exe'
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condition: (SELECTION_1 and SELECTION_2 and not ((SELECTION_3 or SELECTION_4
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or SELECTION_5 or SELECTION_6)))
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falsepositives:
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- unknown
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id: 50f852e6-af22-4c78-9ede-42ef36aa3453
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level: high
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logsource:
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category: image_load
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product: windows
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modified: 2020/12/23
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references:
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- https://posts.specterops.io/requesting-azure-ad-request-tokens-on-azure-ad-joined-machines-for-browser-sso-2b0409caad30
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status: experimental
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tags:
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- attack.defense_evasion
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- attack.privilege_escalation
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- attack.t1073
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- attack.t1574.002
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yml_filename: sysmon_abusing_azure_browser_sso.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/image_load
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