Unusual Volume of Password Updated or Removed

Back


Id	a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce
Rulename	Unusual Volume of Password Updated or Removed
Description	This rule will check if there is an unnormal activity of sites that are deleted or changed per user. The normal amount of actions is calculated based on the previous 14 days of activity. If there is a significant increase, an incident will be created.
Severity	Low
Tactics	Impact
Techniques	T1485
Required data connectors	LastPass
Kind	Scheduled
Query frequency	1d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml
Version	1.0.0
Arm template	a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce.json

KQL

let threshold = toscalar (LastPassNativePoller_CL
| where todatetime(Time_s) >= startofday(ago(14d)) and todatetime(Time_s) < startofday(ago(1d))
| where Action_s == "Site Changed" or Action_s == "Deleted Sites" 
| summarize count() by Username_s, bin(todatetime(Time_s),1d)
| summarize avg(count_), stdev(count_)
| project threshold = avg_count_+stdev_count_*2);
LastPassNativePoller_CL
| where Username_s != "API"
| where Action_s == "Site Changed" or Action_s == "Deleted Sites" and todatetime(Time_s) >= startofday(ago(1d))
| summarize count() by Username_s, IP_Address_s
| where count_ > ['threshold']
| extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s

YAML

id: a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce
triggerThreshold: 0
description: |
  'This rule will check if there is an unnormal activity of sites that are deleted or changed per user.
   The normal amount of actions is calculated based on the previous 14 days of activity. If there is a significant increase, an incident will be created.'  
requiredDataConnectors:
- connectorId: LastPass
  dataTypes:
  - LastPassNativePoller_CL
queryPeriod: 14d
version: 1.0.0
severity: Low
tactics:
- Impact
queryFrequency: 1d
kind: Scheduled
eventGroupingSettings:
  aggregationKind: AlertPerResult
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
name: Unusual Volume of Password Updated or Removed
relevantTechniques:
- T1485
triggerOperator: gt
query: |
  let threshold = toscalar (LastPassNativePoller_CL
  | where todatetime(Time_s) >= startofday(ago(14d)) and todatetime(Time_s) < startofday(ago(1d))
  | where Action_s == "Site Changed" or Action_s == "Deleted Sites" 
  | summarize count() by Username_s, bin(todatetime(Time_s),1d)
  | summarize avg(count_), stdev(count_)
  | project threshold = avg_count_+stdev_count_*2);
  LastPassNativePoller_CL
  | where Username_s != "API"
  | where Action_s == "Site Changed" or Action_s == "Deleted Sites" and todatetime(Time_s) >= startofday(ago(1d))
  | summarize count() by Username_s, IP_Address_s
  | where count_ > ['threshold']
  | extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s  
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml

ARM