Detect Local File InclusionLFI 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
id: 7bb55d05-ef39-4a40-8079-0bc3c05e7881
triggerThreshold: 0
eventGroupingSettings:
aggregationKind: AlertPerResult
severity: High
customDetails:
Decoded_url: Decoded_url
EventStartTime: EventStartTime
EventCount: EventCount
EventEndTime: EventEndTime
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}}'
relevantTechniques:
- T1190
- T1133
- T1059
requiredDataConnectors: []
tags:
- SchemaVersion: 0.2.6
Schema: WebSession
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
version: 1.0.0
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
queryPeriod: 5m
triggerOperator: gt
tactics:
- InitialAccess
- Execution
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/LocalFileInclusion-LFI.yaml
status: Available
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'
name: Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)
kind: Scheduled
queryFrequency: 5m
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/7bb55d05-ef39-4a40-8079-0bc3c05e7881')]",
"properties": {
"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}}'"
},
"alertRuleTemplateName": "7bb55d05-ef39-4a40-8079-0bc3c05e7881",
"customDetails": {
"Decoded_url": "Decoded_url",
"EventCount": "EventCount",
"EventEndTime": "EventEndTime",
"EventStartTime": "EventStartTime"
},
"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",
"displayName": "Detect Local File Inclusion(LFI) in web requests (ASIM Web Session)",
"enabled": true,
"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"
}
]
}
],
"eventGroupingSettings": {
"aggregationKind": "AlertPerResult"
},
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Web Session Essentials/Analytic Rules/LocalFileInclusion-LFI.yaml",
"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",
"severity": "High",
"status": "Available",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Execution",
"InitialAccess"
],
"tags": [
{
"Schema": "WebSession",
"SchemaVersion": "0.2.6"
}
],
"techniques": [
"T1059",
"T1133",
"T1190"
],
"templateVersion": "1.0.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}