mirror of https://github.com/infosecn1nja/HELK.git
130 lines
3.0 KiB
Plaintext
130 lines
3.0 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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"# Suspicious Calculator Usage\n",
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"Detects suspicious use of calc.exe with command line parameters or in a suspicious directory, which is likely caused by some PoC or detection evasion"
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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: Suspicious Calculator Usage\n",
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" id: 737e618a-a410-49b5-bec3-9e55ff7fbc15\n",
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" description: Detects suspicious use of calc.exe with command line parameters or\n",
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" in a suspicious directory, which is likely caused by some PoC or detection evasion\n",
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" status: experimental\n",
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" references:\n",
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" - https://twitter.com/ItsReallyNick/status/1094080242686312448\n",
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" author: Florian Roth\n",
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" date: 2019/02/09\n",
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" tags:\n",
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" - attack.defense_evasion\n",
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" - attack.t1036\n",
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" logsource:\n",
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" category: process_creation\n",
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" product: windows\n",
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" service: null\n",
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" detection:\n",
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" selection1:\n",
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" CommandLine: '*\\calc.exe *'\n",
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" selection2:\n",
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" Image: '*\\calc.exe'\n",
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" filter2:\n",
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" Image: '*\\Windows\\Sys*'\n",
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" condition: selection1 or ( selection2 and not filter2 )\n",
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" falsepositives:\n",
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" - Unknown\n",
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" level: high\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-*', 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='(process_command_line.keyword:*\\\\calc.exe\\ * OR (process_path.keyword:*\\\\calc.exe AND (NOT (process_path.keyword:*\\\\Windows\\\\Sys*))))')\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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