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Determine the MPE RBP Manually

  1. In the Client Console, click Deployment Manager, and then click Entities.
  2. Do one of the following to determine the Destination Risk Level (DRL) and Source Threat Level (STL) for the Origin Host and Impacted Host:
    • For a known host, look at the Entity Hosts grid on the bottom of the window. The DRL is the value in Risk Level column and the STL is the value in the Threat Level column.
    • For an unknown host, look at the Entity Networks grid on the top of the window. Use the IP address to determine whether the host is in a Known Network range.
      • If the IP address is in the Known Network range, then the DRL is the value in Risk Level column and the STL is the value in the Threat Level column.
      • If the IP address is not in the Known Network range, then use the IP address to determine if the host is internal or external, and then use the appropriate global default DRL/STL.

        The IP address is determined to be internal (private) if it is in one of the ranges that follows. If the IP is not in one of these ranges, it is determined to be external (public).

        • 10.0.0.0–10.255.255.255

        • 172.16.0.0–172.31.255.255

        • 192.168.0.0–192.168.255.255

  3. Obtain the Message Classification risk rating from the following table.

    Sub-ClassRating
    Audit1
    Audit/Authentication Success0
    Audit/Authentication Failure3
    Audit/Access Success0
    Audit/Access Failure5
    Audit/Account Created2
    Audit/Account Deleted0
    Audit/Other Audit Success0
    Audit/Account Modified2
    Audit/Access Granted2
    Audit/Access Revoked0
    Audit/Startup and Shutdown0
    Audit/Policy0
    Audit/Configuration0
    Audit/Other Audit Failure4
    Audit/Other0
    Security3
    Security/Reconnaissance1
    Security/Suspicious5
    Security/Misuse2
    Security/Attack9
    Security/Malware6
    Security/Denial of Service7
    Security/Compromise9
    Security/Vulnerability5
    Security/Failed Attack0
    Security/Failed Denial of Service0
    Security/Failed Malware0
    Security/Failed Suspicious0
    Security/Failed Misuse0
    Security/Failed Activity0
    Security/Activity0
    Security/Other3
    Operations2
    Ops/Critical9
    Ops/Error7
    Ops/Warning5
    Ops/Information1
    Ops/Network Allow0
    Ops/Network Deny3
    Ops/Network Traffic0
    Ops/Other2
  4. Open SQL Server, and obtain the Common Event Risk Rating. Query the LogRhythm EMDB CommonEvent table for the Name field that matches the Common Event of the log, as determined by the log source type and MPE rule.

  5. Determine the weights of the values above from the Global RBP settings.
  6. In the Client Console, click Deployment Manager, and then click Platform Manager.
  7. Apply the values  to the MPE RBP formula.
    The MPE RBP formula is RBP = (CRRp + ERRp + DRTp + STLp) / MaxPossibleRiskPoints × 100.

    CRRp = Classification Risk Points = Class Relative Risk Rating × Class Weight

    ERRp = Event Risk Rating Points = Event Risk Rating × Risk Rating Weight

    DRTp = Destination Risk Rating Points = Destination Risk Threshold Points × DRT Weight

    STLp = Source Threat Rating Points = Source Threat Threshold Points × STL Weight

    MaxPossiblePoints = (ClassWt × MAX_CRR) + (EventWt × MAX_ERR) + (STLWt × MAX_STL) + (DRLWt × MAX_DRL)

    (Here, MAX_CRR = MAX_ERR = MAX_STL = MAX_DRL = 9)

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