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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Unusual Process Network Connection

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Unusual Process Network Connection

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Identifies network activity from unexpected system applications. This may indicate adversarial activity as these applications are often leveraged by adversaries to execute code and evade detection.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*

Severity: low

Risk score: 21

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
Execution

Version: 6 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.11.0

Rule authors: Elastic

Rule license: Elastic License

Rule query

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sequence by process.entity_id [process where (process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"bginfo.exe" or process.name : "cdb.exe" or
process.name : "cmstp.exe" or process.name :
"csi.exe" or process.name : "dnx.exe" or
process.name : "fsi.exe" or process.name :
"ieexec.exe" or process.name : "iexpress.exe" or
process.name : "odbcconf.exe" or process.name :
"rcsi.exe" or process.name : "xwizard.exe") and
event.type == "start"] [network where (process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"bginfo.exe" or process.name : "cdb.exe" or
process.name : "cmstp.exe" or process.name :
"csi.exe" or process.name : "dnx.exe" or
process.name : "fsi.exe" or process.name :
"ieexec.exe" or process.name : "iexpress.exe" or
process.name : "odbcconf.exe" or process.name :
"rcsi.exe" or process.name : "xwizard.exe")]

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Trusted Developer Utilities Proxy Execution
- ID: T1127
- Reference URL: https://attack.mitre.org/techniques/T1127/

Rule version history

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Version 6 (7.11.0 release)

Formatting only

Version 5 (7.10.0 release)

Updated query, changed from:

event.category:network and event.type:connection and
process.name:(Microsoft.Workflow.Compiler.exe or bginfo.exe or cdb.exe
or cmstp.exe or csi.exe or dnx.exe or fsi.exe or ieexec.exe or
iexpress.exe or odbcconf.exe or rcsi.exe or xwizard.exe)

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
process.name:(Microsoft.Workflow.Compiler.exe or bginfo.exe or cdb.exe
or cmstp.exe or csi.exe or dnx.exe or fsi.exe or ieexec.exe or
iexpress.exe or odbcconf.exe or rcsi.exe or xwizard.exe)

Version 2 (7.7.0 release)

Updated query, changed from:

event.action:"Network connection detected (rule: NetworkConnect)" and
process.name:(bginfo.exe or cdb.exe or cmstp.exe or csi.exe or dnx.exe
or fsi.exe or ieexec.exe or iexpress.exe or
Microsoft.Workflow.Compiler.exe or odbcconf.exe or rcsi.exe or
xwizard.exe)

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