HELK/docker/helk-jupyter/notebooks/sigma/sysmon_rdp_settings_hijack.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# RDP Sensitive Settings Changed\n",
    "Detects changes to RDP terminal service sensitive settings"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Rule Content\n",
    "```\n",
    "- title: RDP Sensitive Settings Changed\n",
    "  id: 171b67e1-74b4-460e-8d55-b331f3e32d67\n",
    "  description: Detects changes to RDP terminal service sensitive settings\n",
    "  references:\n",
    "  - https://blog.menasec.net/2019/02/threat-hunting-rdp-hijacking-via.html\n",
    "  date: 2019/04/03\n",
    "  author: Samir Bousseaden\n",
    "  logsource:\n",
    "    product: windows\n",
    "    service: sysmon\n",
    "    category: null\n",
    "  detection:\n",
    "    selection_reg:\n",
    "      EventID: 13\n",
    "      TargetObject:\n",
    "      - '*\\services\\TermService\\Parameters\\ServiceDll*'\n",
    "      - '*\\Control\\Terminal Server\\fSingleSessionPerUser*'\n",
    "      - '*\\Control\\Terminal Server\\fDenyTSConnections*'\n",
    "    condition: selection_reg\n",
    "  tags:\n",
    "  - attack.defense_evasion\n",
    "  falsepositives:\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-sysmon-*', 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:\"13\" AND registry_key_path.keyword:(*\\\\services\\\\TermService\\\\Parameters\\\\ServiceDll* OR *\\\\Control\\\\Terminal\\ Server\\\\fSingleSessionPerUser* OR *\\\\Control\\\\Terminal\\ Server\\\\fDenyTSConnections*))')\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
}