Code: p404 Severity: Warning
Description: This event is generated when an mstream agent responds to an mstream handler's "ping" request. Impact: Severe. If the listed source IP is in your network, it may be an mstream agent. If the listed destination IP is in your network, it may be an mstream agent. Corrective: Perform proper forensic analysis on the suspected compromised host to discover the means of compromise. Rebuild a confirmed compromised host. Use a packet-filtering firewall to block inappropriate traffic to the network to prevent hosts from being compromised.
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