Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)
| Id | 7bb55d05-ef39-4a40-8079-0bc3c05e7881 |
| Rulename | Detect Local File Inclusion(LFI) in web requests (ASIM Web Session) |
| Description | LFI vulnerabilities allow an attacker to read (and sometimes execute) files on the victim machine. This can be very dangerous because if the web server is misconfigured and running with high privileges, the attacker may gain access to sensitive information |
| Severity | High |
| Tactics | InitialAccess Execution |
| Techniques | T1190 T1133 T1059 |
| Kind | Scheduled |
| Query frequency | 5m |
| Query period | 5m |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/LocalFileInclusion-LFI.yaml |
| Version | 1.0.0 |
| Arm template | 7bb55d05-ef39-4a40-8079-0bc3c05e7881.json |
let lookback = 5m;
let LFI_Indicators = materialize(externaldata(Indicators: string)
[@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv"]
with(format="csv", ignoreFirstRecord=True));
let CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw("Web_LocalFileInclusionIndicators") // Create new Watchlist and add your custom indicators(Optional)
| extend
Indicators = tostring(WatchlistItem["Indicators"])
| project Indicators
| where isnotempty(Indicators));
let CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;
let knownLFIIndicators=toscalar(CombinedLFIList
| where isnotempty(Indicators)
| summarize make_set(Indicators, 1000));
_Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')
| where isnotempty(Url)
| project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated
| extend Decoded_url = url_decode(Url)
| where Decoded_url has_any (knownLFIIndicators)
| summarize
EventCount=count(),
EventStartTime=min(TimeGenerated),
EventEndTime=max(TimeGenerated)
by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url
| extend
Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")
| order by EventCount desc
tags:
- Schema: WebSession
SchemaVersion: 0.2.6
customDetails:
Decoded_url: Decoded_url
EventEndTime: EventEndTime
EventCount: EventCount
EventStartTime: EventStartTime
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/LocalFileInclusion-LFI.yaml
requiredDataConnectors: []
alertDetailsOverride:
alertDescriptionFormat: User requested for URL '{{Url}}' which contains LFI related keywords or indicators. It suggests an attempt to traverse directories and access files outside the intended directory structure
alertDisplayNameFormat: Potential Local File Inlcusion(LFI) performed by user '{{SrcUsername}}' from IP '{{SrcIpAddr}}'
id: 7bb55d05-ef39-4a40-8079-0bc3c05e7881
tactics:
- InitialAccess
- Execution
queryFrequency: 5m
eventGroupingSettings:
aggregationKind: AlertPerResult
triggerOperator: gt
relevantTechniques:
- T1190
- T1133
- T1059
description: |
'LFI vulnerabilities allow an attacker to read (and sometimes execute) files on the victim machine. This can be very dangerous because if the web server is misconfigured and running with high privileges, the attacker may gain access to sensitive information'
triggerThreshold: 0
kind: Scheduled
name: Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)
query: |
let lookback = 5m;
let LFI_Indicators = materialize(externaldata(Indicators: string)
[@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv"]
with(format="csv", ignoreFirstRecord=True));
let CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw("Web_LocalFileInclusionIndicators") // Create new Watchlist and add your custom indicators(Optional)
| extend
Indicators = tostring(WatchlistItem["Indicators"])
| project Indicators
| where isnotempty(Indicators));
let CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;
let knownLFIIndicators=toscalar(CombinedLFIList
| where isnotempty(Indicators)
| summarize make_set(Indicators, 1000));
_Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')
| where isnotempty(Url)
| project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated
| extend Decoded_url = url_decode(Url)
| where Decoded_url has_any (knownLFIIndicators)
| summarize
EventCount=count(),
EventStartTime=min(TimeGenerated),
EventEndTime=max(TimeGenerated)
by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url
| extend
Name = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),
UPNSuffix = iif(SrcUsername contains "@", tostring(split(SrcUsername, '@', 1)[0]), "")
| order by EventCount desc
entityMappings:
- entityType: IP
fieldMappings:
- columnName: SrcIpAddr
identifier: Address
- entityType: URL
fieldMappings:
- columnName: Url
identifier: Url
- entityType: Account
fieldMappings:
- columnName: Name
identifier: Name
- columnName: UPNSuffix
identifier: UPNSuffix
- entityType: Host
fieldMappings:
- columnName: SrcHostname
identifier: HostName
status: Available
severity: High
version: 1.0.0
queryPeriod: 5m
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)",
"description": "'LFI vulnerabilities allow an attacker to read (and sometimes execute) files on the victim machine. This can be very dangerous because if the web server is misconfigured and running with high privileges, the attacker may gain access to sensitive information'\n",
"severity": "High",
"enabled": true,
"query": "let lookback = 5m;\nlet LFI_Indicators = materialize(externaldata(Indicators: string)\n [@\"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/LocalFileInclusionIndicators.csv\"] \n with(format=\"csv\", ignoreFirstRecord=True));\nlet CustomLocalFileInclusionIndicators = (_ASIM_GetWatchlistRaw(\"Web_LocalFileInclusionIndicators\") // Create new Watchlist and add your custom indicators(Optional)\n | extend\n Indicators = tostring(WatchlistItem[\"Indicators\"])\n | project Indicators\n | where isnotempty(Indicators));\nlet CombinedLFIList = union LFI_Indicators, CustomLocalFileInclusionIndicators;\nlet knownLFIIndicators=toscalar(CombinedLFIList\n | where isnotempty(Indicators)\n | summarize make_set(Indicators, 1000));\n_Im_WebSession(starttime=ago(lookback), url_has_any=knownLFIIndicators, eventresult='Success')\n| where isnotempty(Url)\n| project Url, SrcIpAddr, SrcUsername, SrcHostname, TimeGenerated\n| extend Decoded_url = url_decode(Url)\n| where Decoded_url has_any (knownLFIIndicators)\n| summarize\n EventCount=count(),\n EventStartTime=min(TimeGenerated),\n EventEndTime=max(TimeGenerated)\n by SrcIpAddr, SrcUsername, SrcHostname, Url, Decoded_url\n| extend\n Name = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 0)[0]), SrcUsername),\n UPNSuffix = iif(SrcUsername contains \"@\", tostring(split(SrcUsername, '@', 1)[0]), \"\")\n| order by EventCount desc\n",
"queryFrequency": "PT5M",
"queryPeriod": "PT5M",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess",
"Execution"
],
"techniques": [
"T1190",
"T1133",
"T1059"
],
"alertRuleTemplateName": "7bb55d05-ef39-4a40-8079-0bc3c05e7881",
"eventGroupingSettings": {
"aggregationKind": "AlertPerResult"
},
"alertDetailsOverride": {
"alertDisplayNameFormat": "Potential Local File Inlcusion(LFI) performed by user '{{SrcUsername}}' from IP '{{SrcIpAddr}}'",
"alertDescriptionFormat": "User requested for URL '{{Url}}' which contains LFI related keywords or indicators. It suggests an attempt to traverse directories and access files outside the intended directory structure"
},
"customDetails": {
"Decoded_url": "Decoded_url",
"EventStartTime": "EventStartTime",
"EventEndTime": "EventEndTime",
"EventCount": "EventCount"
},
"entityMappings": [
{
"fieldMappings": [
{
"identifier": "Address",
"columnName": "SrcIpAddr"
}
],
"entityType": "IP"
},
{
"fieldMappings": [
{
"identifier": "Url",
"columnName": "Url"
}
],
"entityType": "URL"
},
{
"fieldMappings": [
{
"identifier": "Name",
"columnName": "Name"
},
{
"identifier": "UPNSuffix",
"columnName": "UPNSuffix"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"identifier": "HostName",
"columnName": "SrcHostname"
}
],
"entityType": "Host"
}
],
"status": "Available",
"templateVersion": "1.0.0",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/LocalFileInclusion-LFI.yaml",
"tags": [
{
"SchemaVersion": "0.2.6",
"Schema": "WebSession"
}
]
}
}
]
}