{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# PowerShell called from an Executable Version Mismatch\n",
    "Detects PowerShell called from an executable by the version mismatch method"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Rule Content\n",
    "```\n",
    "- title: PowerShell called from an Executable Version Mismatch\n",
    "  id: c70e019b-1479-4b65-b0cc-cd0c6093a599\n",
    "  status: experimental\n",
    "  description: Detects PowerShell called from an executable by the version mismatch\n",
    "    method\n",
    "  references:\n",
    "  - https://adsecurity.org/?p=2921\n",
    "  tags:\n",
    "  - attack.defense_evasion\n",
    "  - attack.execution\n",
    "  - attack.t1086\n",
    "  author: Sean Metcalf (source), Florian Roth (rule)\n",
    "  logsource:\n",
    "    product: windows\n",
    "    service: powershell-classic\n",
    "    category: null\n",
    "  detection:\n",
    "    selection1:\n",
    "      EventID: 400\n",
    "      EngineVersion:\n",
    "      - 2.*\n",
    "      - 4.*\n",
    "      - 5.*\n",
    "      HostVersion: 3.*\n",
    "    condition: selection1\n",
    "  falsepositives:\n",
    "  - Penetration Tests\n",
    "  - Unknown\n",
    "  level: high\n",
    "\n",
    "```"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Querying Elasticsearch"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Import Libraries"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from elasticsearch import Elasticsearch\n",
    "from elasticsearch_dsl import Search\n",
    "import pandas as pd"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Initialize Elasticsearch client"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "es = Elasticsearch(['http://helk-elasticsearch:9200'])\n",
    "searchContext = Search(using=es, index='logs-endpoint-winevent-powershell-*', doc_type='doc')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Run Elasticsearch Query"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "s = searchContext.query('query_string', query='(event_id:\"400\" AND powershell.engine.version.keyword:(2.* OR 4.* OR 5.*) AND powershell.host.version.keyword:3.*)')\n",
    "response = s.execute()\n",
    "if response.success():\n",
    "    df = pd.DataFrame((d.to_dict() for d in s.scan()))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Show Results"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "df.head()"
   ]
  }
 ],
 "metadata": {},
 "nbformat": 4,
 "nbformat_minor": 4
}