mirror of https://github.com/infosecn1nja/HELK.git
125 lines
2.9 KiB
Plaintext
125 lines
2.9 KiB
Plaintext
{
|
|
"cells": [
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"# Suspicious Named Error\n",
|
|
"Detects suspicious DNS error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"## Rule Content\n",
|
|
"```\n",
|
|
"- title: Suspicious Named Error\n",
|
|
" id: c8e35e96-19ce-4f16-aeb6-fd5588dc5365\n",
|
|
" status: experimental\n",
|
|
" description: Detects suspicious DNS error messages that indicate a fatal or suspicious\n",
|
|
" error that could be caused by exploiting attempts\n",
|
|
" references:\n",
|
|
" - https://github.com/ossec/ossec-hids/blob/master/etc/rules/named_rules.xml\n",
|
|
" author: Florian Roth\n",
|
|
" date: 2018/02/20\n",
|
|
" logsource:\n",
|
|
" product: linux\n",
|
|
" service: syslog\n",
|
|
" category: null\n",
|
|
" detection:\n",
|
|
" keywords:\n",
|
|
" - '* dropping source port zero packet from *'\n",
|
|
" - '* denied AXFR from *'\n",
|
|
" - '* exiting (due to fatal error)*'\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:(*\\ dropping\\ source\\ port\\ zero\\ packet\\ from\\ * OR *\\ denied\\ AXFR\\ from\\ * OR *\\ exiting\\ \\(due\\ to\\ fatal\\ error\\)*)')\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
|
|
}
|