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

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Suspicious Activity in Shell Commands\n",
    "Detects suspicious shell commands used in various exploit codes (see references)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Rule Content\n",
    "```\n",
    "- title: Suspicious Activity in Shell Commands\n",
    "  id: 2aa1440c-9ae9-4d92-84a7-a9e5f5e31695\n",
    "  description: Detects suspicious shell commands used in various exploit codes (see\n",
    "    references)\n",
    "  references:\n",
    "  - http://www.threatgeek.com/2017/03/widespread-exploitation-attempts-using-cve-2017-5638.html\n",
    "  - https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/struts_code_exec_exception_delegator.rb#L121\n",
    "  - http://pastebin.com/FtygZ1cg\n",
    "  - https://artkond.com/2017/03/23/pivoting-guide/\n",
    "  author: Florian Roth\n",
    "  date: 2017/08/21\n",
    "  modified: 2019/02/05\n",
    "  logsource:\n",
    "    product: linux\n",
    "    service: null\n",
    "    category: null\n",
    "  detection:\n",
    "    keywords:\n",
    "    - wget * - http* | perl\n",
    "    - wget * - http* | sh\n",
    "    - wget * - http* | bash\n",
    "    - python -m SimpleHTTPServer\n",
    "    - -m http.server\n",
    "    - import pty; pty.spawn*\n",
    "    - socat exec:*\n",
    "    - socat -O /tmp/*\n",
    "    - socat tcp-connect*\n",
    "    - '*echo binary >>*'\n",
    "    - '*wget *; chmod +x*'\n",
    "    - '*wget *; chmod 777 *'\n",
    "    - '*cd /tmp || cd /var/run || cd /mnt*'\n",
    "    - '*stop;service iptables stop;*'\n",
    "    - '*stop;SuSEfirewall2 stop;*'\n",
    "    - chmod 777 2020*\n",
    "    - '*>>/etc/rc.local'\n",
    "    - '*base64 -d /tmp/*'\n",
    "    - '* | base64 -d *'\n",
    "    - '*/chmod u+s *'\n",
    "    - '*chmod +s /tmp/*'\n",
    "    - '*chmod u+s /tmp/*'\n",
    "    - '* /tmp/haxhax*'\n",
    "    - '* /tmp/ns_sploit*'\n",
    "    - nc -l -p *\n",
    "    - cp /bin/ksh *\n",
    "    - cp /bin/sh *\n",
    "    - '* /tmp/*.b64 *'\n",
    "    - '*/tmp/ysocereal.jar*'\n",
    "    - '*/tmp/x *'\n",
    "    - '*; chmod +x /tmp/*'\n",
    "    - '*;chmod +x /tmp/*'\n",
    "    condition: keywords\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-*', 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='\\*.keyword:(*wget\\ *\\ \\-\\ http*\\ |\\ perl* OR *wget\\ *\\ \\-\\ http*\\ |\\ sh* OR *wget\\ *\\ \\-\\ http*\\ |\\ bash* OR *python\\ \\-m\\ SimpleHTTPServer* OR *\\-m\\ http.server* OR *import\\ pty;\\ pty.spawn* OR *socat\\ exec\\:* OR *socat\\ \\-O\\ \\/tmp\\/* OR *socat\\ tcp\\-connect* OR *echo\\ binary\\ * OR *wget\\ *;\\ chmod\\ \\+x* OR *wget\\ *;\\ chmod\\ 777\\ * OR *cd\\ \\/tmp\\ \\||\\ cd\\ \\/var\\/run\\ \\||\\ cd\\ \\/mnt* OR *stop;service\\ iptables\\ stop;* OR *stop;SuSEfirewall2\\ stop;* OR *chmod\\ 777\\ 2020* OR *\\/etc\\/rc.local* OR *base64\\ \\-d\\ \\/tmp\\/* OR *\\ |\\ base64\\ \\-d\\ * OR *\\/chmod\\ u\\+s\\ * OR *chmod\\ \\+s\\ \\/tmp\\/* OR *chmod\\ u\\+s\\ \\/tmp\\/* OR *\\ \\/tmp\\/haxhax* OR *\\ \\/tmp\\/ns_sploit* OR *nc\\ \\-l\\ \\-p\\ * OR *cp\\ \\/bin\\/ksh\\ * OR *cp\\ \\/bin\\/sh\\ * OR *\\ \\/tmp\\/*.b64\\ * OR *\\/tmp\\/ysocereal.jar* OR *\\/tmp\\/x\\ * OR *;\\ chmod\\ \\+x\\ \\/tmp\\/* OR *;chmod\\ \\+x\\ \\/tmp\\/*)')\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()"
   ]
  }
 ],
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 "nbformat": 4,
 "nbformat_minor": 4
}