let img_ =
VMwareESXi
| where SyslogMessage has ('Matched discovered VM')
| extend DstHostname = extract(@'vim.VirtualMachine\S+,(.*?)\]', 1, SyslogMessage)
| extend kImageName = extract(@'ds:///vmfs/volumes/(.*)/(.*?),', 2, SyslogMessage)
| summarize img_lst = makeset(kImageName) by DstHostname;
VMwareESXi
| where SyslogMessage has ('Matched discovered VM')
| extend DstHostname = extract(@'vim.VirtualMachine\S+,(.*?)\]', 1, SyslogMessage)
| extend ImageName = extract(@'ds:///vmfs/volumes/(.*)/(.*?),', 2, SyslogMessage)
| join (img_) on DstHostname
| where img_lst !has ImageName
| extend HostCustomEntity = DstHostname
description: |
'Detects unexpected disk image for VM.'
triggerThreshold: 0
queryPeriod: 14d
triggerOperator: gt
kind: Scheduled
relevantTechniques:
- T1496
query: |
let img_ =
VMwareESXi
| where SyslogMessage has ('Matched discovered VM')
| extend DstHostname = extract(@'vim.VirtualMachine\S+,(.*?)\]', 1, SyslogMessage)
| extend kImageName = extract(@'ds:///vmfs/volumes/(.*)/(.*?),', 2, SyslogMessage)
| summarize img_lst = makeset(kImageName) by DstHostname;
VMwareESXi
| where SyslogMessage has ('Matched discovered VM')
| extend DstHostname = extract(@'vim.VirtualMachine\S+,(.*?)\]', 1, SyslogMessage)
| extend ImageName = extract(@'ds:///vmfs/volumes/(.*)/(.*?),', 2, SyslogMessage)
| join (img_) on DstHostname
| where img_lst !has ImageName
| extend HostCustomEntity = DstHostname
queryFrequency: 1h
requiredDataConnectors:
- connectorId: SyslogAma
datatypes:
- Syslog
name: VMware ESXi - Unexpected disk image
severity: Medium
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: HostCustomEntity
entityType: Host
version: 1.0.2
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/VMWareESXi/Analytic Rules/ESXiUnexpectedDiskImage.yaml
status: Available
id: 395c5560-ddc2-45b2-aafe-2e3f64528d3d
tactics:
- Impact
