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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: 5m

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

Maximum alerts per execution: 100

References: None

Tags:

Elastic
Host
Windows
Threat Detection
Defense Evasion

Version: 103

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" and not
         dns.question.name : (
            "ocsp.digicert.com", "ocsp.verisign.com", "ocsp.comodoca.com", "ocsp.entrust.net", "ocsp.usertrust.com",
            "ocsp.godaddy.com", "ocsp.camerfirma.com", "ocsp.globalsign.com", "ocsp.sectigo.com", "*.local"
         )
      ) 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")]

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/

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