Query: write Sigma for Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e
Matching passage: Sigma rule: Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. Logsource: windows / image_load. Rule: title: Potential Azure Browser SSO Abuse id: 50f852e6-af22-4c78-9ede-42ef36aa3453 status: test 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. ' references: - https://posts.specterops.io/requesting-azure-ad-request-tokens-on-azure-ad-joined-machines-for-browser-sso-2b0409caad30 author: Den Iuzvyk date: 2020-07-15 modified: 2023-04-18 tags: - attack.persistence - attack.privilege-escalation - attack.execution - attack.stealth - attack.t1574.001 logsource: category: image_load product: windows detection: selection: ImageLoaded: C:\Windows\System32\MicrosoftAccountTokenProvider.dll filter_main_bgtaskhost: Image|startswith: - C:\Windows\System32\ - C:\Windows\SysWOW64\ Image|endswith: \BackgroundTaskHost.exe filter_optional_devenv: Image|startswith: - C:\Program Files\Microsoft Visual Studio\ - C:\Program Files (x86)\Microsoft Visual Studio\ Image|endswith: \IDE\devenv.exe filter_optional_ie: Image: - C:\Program Files (x86)\Internet Explorer\iexplore.exe - C:\Program Files\Internet Explorer\iexplore.exe filter_optional_edge_1: - Image|startswith: C:\Program Files (x86)\Microsoft\EdgeWebView\Application\ - Image|endswith: \WindowsApps\MicrosoftEdge.exe - Image: - C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe - C:\Program Files\Microsoft\Edge\Application\msedge.exe filter_optional_edge_2: Image|startswith: - C:\Program Files (x86)\Microsoft\EdgeCore\ - C:\Program Files\Microsoft\EdgeCore\ Image|endswith: - \msedge.exe - \msedgewebview2.exe filter_optional_onedrive: Image|endswith: \AppData\Local\Microsoft\OneDrive\OneDrive.exe filter_optional_null: Image: null condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - False positives are expected since this rules is only looking for the DLL load event. This rule is better used in correlation with related activity level: low
Near-miss passage: Sigma rule: Detects the execution of "DXCap.EXE" with the "-c" flag, which allows a user to launch any arbitrary binary or windows p. Logsource: windows / process_creation. Rule: title: New Capture Session Launched Via DXCap.EXE id: 60f16a96-db70-42eb-8f76-16763e333590 status: test description: 'Detects the execution of "DXCap.EXE" with the "-c" flag, which allows a user to launch any arbitrary binary or windows package through DXCap itself. This can be abused to potentially bypass application whitelisting. ' references: - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Dxcap/ - https://twitter.com/harr0ey/status/992008180904419328 author: Beyu Denis, oscd.community, Nasreddine Bencherchali (Nextron Systems) date: 2019-10-26 modified: 2022-06-09 tags: - attack.stealth - attack.t1218 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \DXCap.exe - OriginalFileName: DXCap.exe selection_cli: CommandLine|contains: ' -c ' condition: all of selection* falsepositives: - Legitimate execution of dxcap.exe by legitimate user level: medium