Microsoft COVID-19 file hash indicator matches
| Id | 2be4ef67-a93f-4d8a-981a-88158cb73abd |
| Rulename | Microsoft COVID-19 file hash indicator matches |
| Description | Identifies a match in CommonSecurityLog Event data from any FileHash published in the Microsoft COVID-19 Threat Intel Feed - as described at https://www.microsoft.com/security/blog/2020/05/14/open-sourcing-covid-threat-intelligence/ |
| Severity | Medium |
| Tactics | Execution |
| Techniques | T1204.002 |
| Required data connectors | CefAma PaloAltoNetworks PaloAltoNetworksAma |
| Kind | Scheduled |
| Query frequency | 1h |
| Query period | 14d |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAlto-PAN-OS/Analytic Rules/FileHashEntity_Covid19_CommonSecurityLog.yaml |
| Version | 1.3.5 |
| Arm template | 2be4ef67-a93f-4d8a-981a-88158cb73abd.json |
let dt_lookBack = 1h;
let covidIndicators = (externaldata(TimeGenerated:datetime, FileHashValue:string, FileHashType: string, TlpLevel: string, Product: string, ThreatType: string, Description: string )
[@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/Microsoft.Covid19.Indicators.csv"] with (format="csv"));
let fileHashIndicators = covidIndicators
| where isnotempty(FileHashValue);
// Handle matches against both lower case and uppercase versions of the hash:
(fileHashIndicators | extend FileHashValue = tolower(FileHashValue)
| union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)
| where isnotempty(FileHash)
| extend CommonSecurityLog_TimeGenerated = TimeGenerated
)
on $left.FileHashValue == $right.FileHash
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by FileHashValue
| project CommonSecurityLog_TimeGenerated, FileHashValue, FileHashType, Description, ThreatType,
SourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction,
RequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity
| extend AccountName = tostring(split(SourceUserName, "@")[0]), AccountUPNSuffix = tostring(split(SourceUserName, "@")[1])
| extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)
entityMappings:
- entityType: Account
fieldMappings:
- columnName: SourceUserName
identifier: FullName
- columnName: AccountName
identifier: Name
- columnName: AccountUPNSuffix
identifier: UPNSuffix
- entityType: Host
fieldMappings:
- columnName: DeviceName
identifier: FullName
- columnName: HostName
identifier: HostName
- columnName: HostNameDomain
identifier: DnsDomain
- entityType: IP
fieldMappings:
- columnName: SourceIP
identifier: Address
- entityType: FileHash
fieldMappings:
- columnName: FileHashValue
identifier: Value
- columnName: FileHashType
identifier: Algorithm
tactics:
- Execution
triggerOperator: gt
description: |
'Identifies a match in CommonSecurityLog Event data from any FileHash published in the Microsoft COVID-19 Threat Intel Feed - as described at https://www.microsoft.com/security/blog/2020/05/14/open-sourcing-covid-threat-intelligence/'
requiredDataConnectors:
- connectorId: PaloAltoNetworks
dataTypes:
- CommonSecurityLog
- connectorId: PaloAltoNetworksAma
dataTypes:
- CommonSecurityLog
- connectorId: CefAma
dataTypes:
- CommonSecurityLog
relevantTechniques:
- T1204.002
version: 1.3.5
id: 2be4ef67-a93f-4d8a-981a-88158cb73abd
kind: Scheduled
query: |
let dt_lookBack = 1h;
let covidIndicators = (externaldata(TimeGenerated:datetime, FileHashValue:string, FileHashType: string, TlpLevel: string, Product: string, ThreatType: string, Description: string )
[@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/Microsoft.Covid19.Indicators.csv"] with (format="csv"));
let fileHashIndicators = covidIndicators
| where isnotempty(FileHashValue);
// Handle matches against both lower case and uppercase versions of the hash:
(fileHashIndicators | extend FileHashValue = tolower(FileHashValue)
| union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique (
CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)
| where isnotempty(FileHash)
| extend CommonSecurityLog_TimeGenerated = TimeGenerated
)
on $left.FileHashValue == $right.FileHash
| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by FileHashValue
| project CommonSecurityLog_TimeGenerated, FileHashValue, FileHashType, Description, ThreatType,
SourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction,
RequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity
| extend AccountName = tostring(split(SourceUserName, "@")[0]), AccountUPNSuffix = tostring(split(SourceUserName, "@")[1])
| extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)
status: Available
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAlto-PAN-OS/Analytic Rules/FileHashEntity_Covid19_CommonSecurityLog.yaml
queryFrequency: 1h
severity: Medium
name: Microsoft COVID-19 file hash indicator matches
queryPeriod: 14d
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/2be4ef67-a93f-4d8a-981a-88158cb73abd')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/2be4ef67-a93f-4d8a-981a-88158cb73abd')]",
"properties": {
"alertRuleTemplateName": "2be4ef67-a93f-4d8a-981a-88158cb73abd",
"customDetails": null,
"description": "'Identifies a match in CommonSecurityLog Event data from any FileHash published in the Microsoft COVID-19 Threat Intel Feed - as described at https://www.microsoft.com/security/blog/2020/05/14/open-sourcing-covid-threat-intelligence/'\n",
"displayName": "Microsoft COVID-19 file hash indicator matches",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "SourceUserName",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DeviceName",
"identifier": "FullName"
},
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "HostNameDomain",
"identifier": "DnsDomain"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIP",
"identifier": "Address"
}
]
},
{
"entityType": "FileHash",
"fieldMappings": [
{
"columnName": "FileHashValue",
"identifier": "Value"
},
{
"columnName": "FileHashType",
"identifier": "Algorithm"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PaloAlto-PAN-OS/Analytic Rules/FileHashEntity_Covid19_CommonSecurityLog.yaml",
"query": "let dt_lookBack = 1h;\nlet covidIndicators = (externaldata(TimeGenerated:datetime, FileHashValue:string, FileHashType: string, TlpLevel: string, Product: string, ThreatType: string, Description: string )\n[@\"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Feeds/Microsoft.Covid19.Indicators.csv\"] with (format=\"csv\"));\nlet fileHashIndicators = covidIndicators\n| where isnotempty(FileHashValue);\n// Handle matches against both lower case and uppercase versions of the hash:\n(fileHashIndicators | extend FileHashValue = tolower(FileHashValue)\n| union (fileHashIndicators | extend FileHashValue = toupper(FileHashValue)))\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique (\n CommonSecurityLog | where TimeGenerated >= ago(dt_lookBack)\n | where isnotempty(FileHash)\n | extend CommonSecurityLog_TimeGenerated = TimeGenerated\n )\non $left.FileHashValue == $right.FileHash\n| summarize CommonSecurityLog_TimeGenerated = arg_max(CommonSecurityLog_TimeGenerated, *) by FileHashValue\n| project CommonSecurityLog_TimeGenerated, FileHashValue, FileHashType, Description, ThreatType,\nSourceIP, SourcePort, DestinationIP, DestinationPort, SourceUserID, SourceUserName, DeviceName, DeviceAction,\nRequestURL, DestinationUserName, DestinationUserID, ApplicationProtocol, Activity\n| extend AccountName = tostring(split(SourceUserName, \"@\")[0]), AccountUPNSuffix = tostring(split(SourceUserName, \"@\")[1])\n| extend HostName = tostring(split(DeviceName, \".\")[0]), DomainIndex = toint(indexof(DeviceName, '.'))\n| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"status": "Available",
"subTechniques": [
"T1204.002"
],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Execution"
],
"techniques": [
"T1204"
],
"templateVersion": "1.3.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}