IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Direct Outbound SMB Connection

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Direct Outbound SMB Connection

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Identifies unexpected processes making network connections over port 445. Windows File Sharing is typically implemented over Server Message Block (SMB), which communicates between hosts using port 445. When legitimate, these network connections are established by the kernel. Processes making 445/tcp connections may be port scanners, exploits, or suspicious user-level processes moving laterally.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Lateral Movement

Version: 5 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Rule query

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sequence by process.entity_id [process where event.type == "start"
and process.pid != 4] [network where destination.port == 445 and
process.pid != 4 and not cidrmatch(destination.ip, "127.0.0.1",
"::1")]

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Exploitation of Remote Services
- ID: T1210
- Reference URL: https://attack.mitre.org/techniques/T1210/

Rule version history

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Version 5 (7.10.0 release)

Updated query, changed from:

event.category:network and event.type:connection and
destination.port:445 and not process.pid:4 and not
destination.ip:(127.0.0.1 or "::1")

Version 4 (7.9.1 release)

Formatting only

Version 3 (7.9.0 release)

Updated query, changed from:

event.action:"Network connection detected (rule: NetworkConnect)" and
destination.port:445 and not process.pid:4 and not
destination.ip:(127.0.0.1 or "::1")

Version 2 (7.7.0 release)

Updated query, changed from:

event.action:"Network connection detected (rule: NetworkConnect)" and
destination.port:445 and not process.pid:4 and not
destination.ip:("127.0.0.1" or "::1")

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