Microsoft Sentinel high experimental kql

Abnormal Security - Account Takeover case opened

'Creates an incident when Abnormal Security opens an Account Takeover (ATO) case, indicating a mailbox or user account is suspected to be compromised. The ATO case severity, status, and observed indicators are surfaced for triage.'

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Detection Logic

ABNORMAL_SECURITY_ATO_CASE_CL
| where isnotempty(abx_body_abx_body_ato_case_id_s)
// Collapse to one row per ATO case (earliest event in the window) so repeated
// events for the same case do not raise duplicate alerts.
| summarize arg_min(TimeGenerated, *) by CaseId = abx_body_abx_body_ato_case_id_s
| extend
    CompromisedAccount = abx_body_abx_body_compromised_account_s,
    CaseSeverity = abx_body_abx_body_severity_s,
    CaseStatus = abx_body_abx_body_status_s,
    Indicators = abx_body_abx_body_indicators_s,
    FirstDetected = abx_body_abx_body_first_detected_t
| project TimeGenerated, CompromisedAccount, CaseId, CaseSeverity, CaseStatus, Indicators, FirstDetected

Field Validations

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