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Unusual Network Activity from a Windows System Binary

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Unusual Network Activity from a Windows System Binary

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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:

logs-endpoint.events.*
winlogbeat-*
logs-windows.*

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
Defense Evasion

Version: 101 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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sequence by process.entity_id with maxspan=5m [process where
event.type == "start" and /* known applocker bypasses */
(process.name : "bginfo.exe" or process.name : "cdb.exe" or
process.name : "control.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 :
"installutil.exe" or process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"MSBuild.exe" or process.name : "msdt.exe" or process.name
: "mshta.exe" or process.name : "msiexec.exe" or
process.name : "msxsl.exe" or process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or process.name : "regsvr32.exe" or
process.name : "xwizard.exe")] [network where (process.name :
"bginfo.exe" or process.name : "cdb.exe" or process.name :
"control.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 :
"installutil.exe" or process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"MSBuild.exe" or process.name : "msdt.exe" or process.name
: "mshta.exe" or process.name : "msiexec.exe" or
process.name : "msxsl.exe" or process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or process.name : "regsvr32.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 101 (8.5.0 release)

Updated query, changed from:

sequence by process.entity_id with maxspan=5m [process where
event.type in ("start", "process_started") and /* known
applocker bypasses */ (process.name : "bginfo.exe" or
process.name : "cdb.exe" or process.name : "control.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 : "installutil.exe" or process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"MSBuild.exe" or process.name : "msdt.exe" or process.name
: "mshta.exe" or process.name : "msiexec.exe" or
process.name : "msxsl.exe" or process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or process.name : "regsvr32.exe" or
process.name : "xwizard.exe")] [network where (process.name :
"bginfo.exe" or process.name : "cdb.exe" or process.name :
"control.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 :
"installutil.exe" or process.name :
"Microsoft.Workflow.Compiler.exe" or process.name :
"MSBuild.exe" or process.name : "msdt.exe" or process.name
: "mshta.exe" or process.name : "msiexec.exe" or
process.name : "msxsl.exe" or process.name : "odbcconf.exe" or
process.name : "rcsi.exe" or process.name : "regsvr32.exe" or
process.name : "xwizard.exe")]

Version 3 (8.4.0 release)

Formatting only

Version 2 (7.12.0 release)

Formatting only

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