Powershell executed "Get-Content -Stream or Invoke-Expresion". Possible string execution as code

Description

Powershell executed "Get-Content -Stream or Invoke-Expresion". Possible string execution as code

Query · wazuh

field win.eventdata.scriptBlockText="(?i)(Get-Content.+\-Stream|IEX|Invoke-Expresion)"

Fires when

Wazuh evaluates a chain top-down. Every rule above this one must match on the same event before this rule is tested at all.

  1. 60000 Group of windows rules. anchor level 0
    decoded_as=windows_eventchannel AND field win.system.providerName="\.+"
  2. 91801 Group of Windows rules for the Powershell/Operational channel. anchor level 0
    field win.system.channel="^Microsoft-Windows-PowerShell/Operational$"
  3. 91802 Group of Windows rules for the Powershell/Operational channel. anchor level 0
    field win.eventdata.ScriptBlockId=".+"
  4. 91837 Powershell executed "Get-Content -Stream or Invoke-Expresion". Possible string execution as code refinement level 4 this rule
    field win.eventdata.scriptBlockText="(?i)(Get-Content.+\-Stream|IEX|Invoke-Expresion)"

Rule dependencies

Depends on

Raw source Powershell executed "Get-Content -Stream or Invoke-Expresion". Possible string execution as code · Wazuh XML
Esc
Published by Wazuh Core Ruleset ↗, licensed under GPLv2 ↗. Reproduced here unmodified. 
<rule id="91837" level="4">
    <if_sid>91802</if_sid>
    <field name="win.eventdata.scriptBlockText" type="pcre2">(?i)(Get-Content.+\-Stream|IEX|Invoke-Expresion)</field>
    <options>no_full_log</options>
    <description>Powershell executed "Get-Content -Stream or Invoke-Expresion". Possible string execution as code</description>
    <mitre>
      <id>T1059.001</id>
    </mitre>
  </rule>

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