Unusual Process Network Connectionedit

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.*
  • logs-windows.*

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
  • Defense Evasion

Version: 7 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule queryedit

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 mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 7 (7.12.0 release)
  • Formatting only
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)