Analytics Alerts

Browse the Cortex analytics alert reference.

Severity ▾
Detection module ▾
Data source ▾

1 alert match the current filters. technique: T1187 ✕

Download CSV Show ATT&CK heatmap
  • Unusual Encrypting File System Remote call (EFSRPC) to domain controller Low Identity Analytics 3 variations

    An unusual Encrypting File System Remote call (EFSRPC) was made to a domain controller.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Day
    ATT&CK tactics: Credential Access (TA0006)
    ATT&CK techniques: Forced Authentication (T1187) Adversary-in-the-Middle: Name Resolution Poisoning and SMB Relay (T1557.001)
    Required data: XDR Agent with eXtended Threat Hunting (XTH)
    Attacker's goals: An attacker can abuse the Encrypting File System Remote Protocol to coerce authentication from a DC. This authentication can later be used for obtaining a DC certificate for DCSync.
    Investigative actions: Check for a suspicious process on the initiator. Check if the source host is a vulnerability scanner. Check for unusual connections from the server of the requested file location (it may be a relay server). Look for unusual AD CS certificate requests. Look for following suspicious connections using the DC machine account. Check for possible DCSync alerts.

    Variations

    A suspicious Encrypting File System Remote call (EFSRPC) was made to a domain controller

    Medium overridden

    An unusual Encrypting File System Remote call (EFSRPC) was made to a domain controller. overridden

    Abnormal Encrypting File System Remote call (EFSRPC) to domain controller using EfsRpcFileKeyInfo for the first time

    Low overridden

    An abnormal EfsRpcFileKeyInfo Encrypting File System Remote call (EFSRPC) was made to a domain controller for the first time. overridden

    Abnormal Encrypting File System Remote call (EFSRPC) to domain controller using EfsRpcFileKeyInfo

    Informational overridden

    An abnormal EfsRpcFileKeyInfo Encrypting File System Remote call (EFSRPC) was made to a domain controller. overridden