Detection rules › Kusto
VMware ESXi - Low patch disk space
'This rule is triggered when low patch disk store space is detected.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Impact |
Rule body
id: 48d992ba-d404-4159-a8c6-46f51d1325c7
name: VMware ESXi - Low patch disk space
description: |
'This rule is triggered when low patch disk store space is detected.'
severity: Medium
status: Available
requiredDataConnectors:
- connectorId: SyslogAma
datatypes:
- Syslog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- Impact
relevantTechniques:
- T1529
query: |
let threshold = 100;
VMwareESXi
| where SyslogMessage has ('Patch store disk')
| extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
| where sp < threshold
| extend h = 'Hypervisor'
| extend HostCustomEntity = h
entityMappings:
- entityType: Host
fieldMappings:
- identifier: FullName
columnName: HostCustomEntity
version: 1.0.2
kind: Scheduled
Stages and Predicates
Parameters
let threshold = 100;
Stage 1: source
VMwareESXi
Stage 2: where
| where SyslogMessage has ('Patch store disk')
Stage 3: extend
| extend sp = toreal(extract(@'free space is:\s(\d+)', 1, SyslogMessage)) / 1000000000
Stage 4: where
| where sp < threshold
Stage 5: extend
| extend h = 'Hypervisor'
Stage 6: extend
| extend HostCustomEntity = h
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
SyslogMessage | match |
| field:"SyslogMessage" kind:match value:"Patch store disk" |
sp | lt |
| field:"sp" kind:lt value:"100" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
sp | extend |
h | extend |
HostCustomEntity | extend |