mirror of https://github.com/infosecn1nja/HELK.git
150 lines
3.7 KiB
Plaintext
150 lines
3.7 KiB
Plaintext
{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Rundll32 Internet Connection\n",
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"Detects a rundll32 that communicates with public IP addresses"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Rule Content\n",
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"```\n",
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"- title: Rundll32 Internet Connection\n",
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" id: cdc8da7d-c303-42f8-b08c-b4ab47230263\n",
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" status: experimental\n",
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" description: Detects a rundll32 that communicates with public IP addresses\n",
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" references:\n",
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" - https://www.hybrid-analysis.com/sample/759fb4c0091a78c5ee035715afe3084686a8493f39014aea72dae36869de9ff6?environmentId=100\n",
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" author: Florian Roth\n",
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" date: 2017/11/04\n",
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" tags:\n",
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" - attack.t1085\n",
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" - attack.defense_evasion\n",
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" - attack.execution\n",
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" logsource:\n",
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" product: windows\n",
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" service: sysmon\n",
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" category: null\n",
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" detection:\n",
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" selection:\n",
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" EventID: 3\n",
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" Image: '*\\rundll32.exe'\n",
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" Initiated: 'true'\n",
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" filter:\n",
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" DestinationIp:\n",
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" - 10.*\n",
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" - 192.168.*\n",
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" - 172.16.*\n",
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" - 172.17.*\n",
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" - 172.18.*\n",
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" - 172.19.*\n",
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" - 172.20.*\n",
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" - 172.21.*\n",
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" - 172.22.*\n",
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" - 172.23.*\n",
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" - 172.24.*\n",
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" - 172.25.*\n",
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" - 172.26.*\n",
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" - 172.27.*\n",
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" - 172.28.*\n",
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" - 172.29.*\n",
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" - 172.30.*\n",
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" - 172.31.*\n",
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" - 127.*\n",
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" condition: selection and not filter\n",
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" falsepositives:\n",
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" - Communication to other corporate systems that use IP addresses from public address\n",
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" spaces\n",
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" level: medium\n",
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"\n",
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"```"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Querying Elasticsearch"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Import Libraries"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"from elasticsearch import Elasticsearch\n",
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"from elasticsearch_dsl import Search\n",
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"import pandas as pd"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Initialize Elasticsearch client"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"es = Elasticsearch(['http://helk-elasticsearch:9200'])\n",
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"searchContext = Search(using=es, index='logs-endpoint-winevent-sysmon-*', doc_type='doc')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Run Elasticsearch Query"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"s = searchContext.query('query_string', query='((event_id:\"3\" AND process_path.keyword:*\\\\rundll32.exe AND network_initiated:\"true\") AND (NOT (dst_ip_addr.keyword:(10.* OR 192.168.* OR 172.16.* OR 172.17.* OR 172.18.* OR 172.19.* OR 172.20.* OR 172.21.* OR 172.22.* OR 172.23.* OR 172.24.* OR 172.25.* OR 172.26.* OR 172.27.* OR 172.28.* OR 172.29.* OR 172.30.* OR 172.31.* OR 127.*))))')\n",
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"response = s.execute()\n",
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"if response.success():\n",
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" df = pd.DataFrame((d.to_dict() for d in s.scan()))"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Show Results"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"df.head()"
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]
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}
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],
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"metadata": {},
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"nbformat": 4,
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"nbformat_minor": 4
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}
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