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

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Suspect svchost Activity\n",
    "It is extremely abnormal for svchost.exe to spawn without any CLI arguments and is normally observed when a malicious process spawns the process and injects code into the process memory space."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Rule Content\n",
    "```\n",
    "- title: Suspect svchost Activity\n",
    "  id: 16c37b52-b141-42a5-a3ea-bbe098444397\n",
    "  status: experimental\n",
    "  description: It is extremely abnormal for svchost.exe to spawn without any CLI arguments\n",
    "    and is normally observed when a malicious process spawns the process and injects\n",
    "    code into the process memory space.\n",
    "  references:\n",
    "  - https://securitybytes.io/blue-team-fundamentals-part-two-windows-processes-759fe15965e2\n",
    "  author: David Burkett\n",
    "  date: 12/28/2019\n",
    "  tags:\n",
    "  - attack.t1055\n",
    "  logsource:\n",
    "    category: process_creation\n",
    "    product: windows\n",
    "    service: null\n",
    "  detection:\n",
    "    selection1:\n",
    "      CommandLine: null\n",
    "    selection2:\n",
    "      Image: '*\\svchost.exe'\n",
    "    filter:\n",
    "      ParentImage:\n",
    "      - '*\\rpcnet.exe'\n",
    "      - '*\\rpcnetp.exe'\n",
    "    condition: (selection1 and selection2) and not filter\n",
    "  fields:\n",
    "  - CommandLine\n",
    "  - ParentCommandLine\n",
    "  falsepositives:\n",
    "  - rpcnet.exe / rpcnetp.exe which is a lojack style software. https://www.blackhat.com/docs/us-14/materials/us-14-Kamlyuk-Kamluk-Computrace-Backdoor-Revisited.pdf\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='((NOT _exists_:process_command_line AND process_path.keyword:*\\\\svchost.exe) AND (NOT (process_parent_path.keyword:(*\\\\rpcnet.exe OR *\\\\rpcnetp.exe))))')\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
}