IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
« RPC (Remote Procedure Call) from the Internet Ransomware - Detected - Elastic Endgame »
Elastic Docs ›Elastic Security Solution [8.5] ›Detections and alerts ›Prebuilt rule reference

RPC (Remote Procedure Call) to the Internet

edit

RPC (Remote Procedure Call) to the Internet

edit

This rule detects network events that may indicate the use of RPC traffic to the Internet. RPC is commonly used by system administrators to remotely control a system for maintenance or to use shared resources. It should almost never be directly exposed to the Internet, as it is frequently targeted and exploited by threat actors as an initial access or backdoor vector.

Rule type: query

Rule indices:

  • auditbeat-*
  • filebeat-*
  • packetbeat-*
  • logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Network
  • Threat Detection
  • Initial Access
  • Host

Version: 100 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

edit
event.category:(network or network_traffic) and network.transport:tcp
and (destination.port:135 or event.dataset:zeek.dce_rpc) and
source.ip:( 10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16
) and not destination.ip:( 10.0.0.0/8 or 127.0.0.0/8 or
169.254.0.0/16 or 172.16.0.0/12 or 192.0.0.0/24 or
192.0.0.0/29 or 192.0.0.8/32 or 192.0.0.9/32 or
192.0.0.10/32 or 192.0.0.170/32 or 192.0.0.171/32 or
192.0.2.0/24 or 192.31.196.0/24 or 192.52.193.0/24 or
192.168.0.0/16 or 192.88.99.0/24 or 224.0.0.0/4 or
100.64.0.0/10 or 192.175.48.0/24 or 198.18.0.0/15 or
198.51.100.0/24 or 203.0.113.0/24 or 240.0.0.0/4 or "::1"
or "FE80::/10" or "FF00::/8" )

Threat mapping

edit

Framework: MITRE ATT&CKTM

Rule version history

edit
Version 100 (8.5.0 release)
  • Formatting only
Version 12 (8.4.0 release)
  • Formatting only
Version 11 (7.15.0 release)
  • Formatting only
Version 10 (7.14.0 release)

  • Updated query, changed from:

    event.category:(network or network_traffic) and network.transport:tcp
and (destination.port:135 or event.dataset:zeek.dce_rpc) and
source.ip:( 10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16 ) and not
destination.ip:( 10.0.0.0/8 or 127.0.0.0/8 or 169.254.0.0/16 or
172.16.0.0/12 or 192.168.0.0/16 or 224.0.0.0/4 or "::1" or "FE80::/10"
or "FF00::/8" )
Version 8 (7.12.0 release)
  • Formatting only
Version 7 (7.11.2 release)
  • Formatting only
Version 6 (7.11.0 release)

  • Updated query, changed from:

    event.category:(network or network_traffic) and network.transport:tcp
and (destination.port:135 or event.dataset:zeek.dce_rpc) and
source.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16) and not
destination.ip:(10.0.0.0/8 or 127.0.0.0/8 or 172.16.0.0/12 or
192.168.0.0/16 or "::1")
Version 5 (7.10.0 release)
  • Formatting only
Version 4 (7.9.0 release)

  • Updated query, changed from:

    network.transport:tcp and destination.port:135 and
source.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16) and not
destination.ip:(10.0.0.0/8 or 127.0.0.0/8 or 172.16.0.0/12 or
192.168.0.0/16 or "::1")
Version 3 (7.7.0 release)

  • Updated query, changed from:

    network.transport: tcp and destination.port: 135 and (
network.direction: outbound or ( source.ip: (10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16) and not destination.ip: (10.0.0.0/8
or 172.16.0.0/12 or 192.168.0.0/16) ) )
Version 2 (7.6.1 release)
  • Removed auditbeat-*, packetbeat-*, and winlogbeat-* from the rule indices.
« RPC (Remote Procedure Call) from the Internet Ransomware - Detected - Elastic Endgame »