{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Webshell Remote Command Execution\n",
    "Detects posible command execution by web application/web shell"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Rule Content\n",
    "```\n",
    "- title: Webshell Remote Command Execution\n",
    "  id: c0d3734d-330f-4a03-aae2-65dacc6a8222\n",
    "  status: experimental\n",
    "  description: Detects posible command execution by web application/web shell\n",
    "  tags:\n",
    "  - attack.persistence\n",
    "  - attack.t1100\n",
    "  references:\n",
    "  - personal experience\n",
    "  author: Ilyas Ochkov, Beyu Denis, oscd.community\n",
    "  date: 2019/10/12\n",
    "  modified: 2019/11/04\n",
    "  logsource:\n",
    "    product: linux\n",
    "    service: auditd\n",
    "    category: null\n",
    "  detection:\n",
    "    selection:\n",
    "      type: SYSCALL\n",
    "      SYSCALL: execve\n",
    "      key: detect_execve_www\n",
    "    condition: selection\n",
    "  falsepositives:\n",
    "  - Admin activity\n",
    "  - Crazy web applications\n",
    "  level: critical\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-*', 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='(type:\"SYSCALL\" AND SYSCALL:\"execve\" AND key:\"detect_execve_www\")')\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
}