High Severity

Link: Suspicious Office 365 app authorization (OAuth) link

Labels

Description

Detects inbound messages with body links to a suspicious Office 365 app authorization (OAuth) request. The app may be compromised or was stood up for malicious purposes. Once the app has been authorized, the attacker will have read or write permissions to the user's Office 365 account.

References

https://info.phishlabs.com/blog/office-365-phishing-uses-malicious-app-persist-password-reset

Sublime Security

Created Aug 17th, 2023 • Last updated Oct 4th, 2026

Feed Source

Sublime Core Feed

Source

GitHub

type.inbound
and any([body.links, body.current_thread.links],
        any(.,
            (
              .href_url.domain.domain in (
                'login.microsoftonline.com',
                'login.microsoft.com'
              )
              or strings.icontains(.href_url.query_params,
                                   "login.microsoftonline.com",
                                   'login.microsoft.com'
              )
            )
            and (
              strings.ilike(.href_url.query_params,
                            '*offline_access*',
                            '*.readwrite*',
                            '*.read*',
                            '*ctx=*',
                            '*prompt=none*'
              )
              or (
                (
                  strings.icontains(.href_url.path, '/common/reprocess')
                  or strings.icontains(.href_url.query_params,
                                       "/common/reprocess"
                  )
                )
                and strings.icontains(.href_url.query_params, 'ctx=')
                and strings.icontains(.href_url.query_params, 'sessionId=')
              )
            )
        )
)

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