//CVE-2023-4863 Process activity with .webp files on devices where CVE-2023-4863 is unpatched
//This query shows all process activity with .webp files on vulnerable machines and is not an indicator of malicious activity
let VulnDevices = DeviceTvmSoftwareVulnerabilities
| where CveId == "CVE-2023-4863"
| distinct DeviceId;
union DeviceProcessEvents, DeviceNetworkEvents, DeviceEvents
| where DeviceId in (VulnDevices) and (InitiatingProcessCommandLine has(".webp") or ProcessCommandLine has(".webp"))
| extend Name = tostring(split(AccountUpn, "@")[0]), UPNSuffix = tostring(split(AccountUpn, "@")[1])
| extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)
description: |
'This query looks at device, process, and network events from Defender for Endpoint that may be vulnerable to buffer overflow defined in CVE-2023-4863. Results are not an indicator of malicious activity.'
entityMappings:
- fieldMappings:
- columnName: DeviceName
identifier: FullName
- columnName: HostName
identifier: HostName
- columnName: HostNameDomain
identifier: DnsDomain
entityType: Host
- fieldMappings:
- columnName: AccountUpn
identifier: FullName
- columnName: Name
identifier: Name
- columnName: UPNSuffix
identifier: UPNSuffix
entityType: Account
- fieldMappings:
- columnName: LocalIP
identifier: Address
entityType: IP
- fieldMappings:
- columnName: ProcessId
identifier: ProcessId
entityType: Process
- fieldMappings:
- columnName: InitiatingProcessId
identifier: ProcessId
entityType: Process
- fieldMappings:
- columnName: ProcessCommandLine
identifier: CommandLine
entityType: Process
kind: Scheduled
tactics:
- Execution
severity: Informational
triggerThreshold: 0
queryFrequency: 1h
status: Available
queryPeriod: 1h
relevantTechniques:
- T1203
tags:
- CVE-2023-4863
id: 26e81021-2de6-4442-a74a-a77885e96911
name: Execution of software vulnerable to webp buffer overflow of CVE-2023-4863
incidentConfiguration:
createIncident: false
groupingConfiguration:
reopenClosedIncident: false
groupByCustomDetails: []
enabled: false
matchingMethod: Selected
groupByAlertDetails: []
groupByEntities:
- Account
lookbackDuration: PT5H
query: |-
//CVE-2023-4863 Process activity with .webp files on devices where CVE-2023-4863 is unpatched
//This query shows all process activity with .webp files on vulnerable machines and is not an indicator of malicious activity
let VulnDevices = DeviceTvmSoftwareVulnerabilities
| where CveId == "CVE-2023-4863"
| distinct DeviceId;
union DeviceProcessEvents, DeviceNetworkEvents, DeviceEvents
| where DeviceId in (VulnDevices) and (InitiatingProcessCommandLine has(".webp") or ProcessCommandLine has(".webp"))
| extend Name = tostring(split(AccountUpn, "@")[0]), UPNSuffix = tostring(split(AccountUpn, "@")[1])
| extend HostName = tostring(split(DeviceName, ".")[0]), DomainIndex = toint(indexof(DeviceName, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(DeviceName, DomainIndex + 1), DeviceName)
triggerOperator: gt
version: 1.1.2
suppressionEnabled: false
suppressionDuration: PT5H
eventGroupingSettings:
aggregationKind: SingleAlert
alertDetailsOverride:
alertDynamicProperties: []
alertDisplayNameFormat: Possible exploitation of CVE-2023-4863
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/PossibleWebpBufferOverflow.yaml
requiredDataConnectors:
- dataTypes:
- DeviceProcessEvents
- DeviceNetworkEvents
- DeviceEvents
- DeviceTvmSoftwareVulnerabilities
connectorId: MicrosoftThreatProtection
