Unusual Volume of Password Updated or Removed

Status: available
Severity: low
Time window: 14d
Group by: IP_Address_s, Username_s
Source: github.com/Azure/Azure-Sentinel

'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.'

MITRE ATT&CK coverage

Tactic	Techniques
Impact	`T1485` Data Destruction

Rule body kusto

id: a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce
name: 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
status: Available
requiredDataConnectors:
  - connectorId: LastPass
    dataTypes:
      - LastPassNativePoller_CL
queryFrequency: 1d
queryPeriod: 14d
triggerOperator: gt
triggerThreshold: 0
eventGroupingSettings:
  aggregationKind: AlertPerResult
tactics:
  - Impact
relevantTechniques:
 - T1485
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
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountCustomEntity
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Let binding: `threshold`

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);

Stage 1: `source`

LastPassNativePoller_CL

Stage 2: `where`

| where Username_s != "API"

Stage 3: `where`

| where Action_s == "Site Changed" or Action_s == "Deleted Sites" and todatetime(Time_s) >= startofday(ago(1d))

Stage 4: `summarize`

| summarize count() by Username_s, IP_Address_s

Stage 5: `where`

| where count_ > ['threshold']

References threshold (defined above).

Stage 6: `extend`

| extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Action_s`	eq	`Deleted Sites` transforms: `cased` `Site Changed` transforms: `cased`
`Username_s`	ne	`API` transforms: `cased`

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`IP_Address_s`	`summarize`
`Username_s`	`summarize`
`AccountCustomEntity`	`extend`
`IPCustomEntity`	`extend`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Unusual Volume of Password Updated or Removed

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: `threshold`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `summarize`

Stage 5: `where`

Stage 6: `extend`

Indicators

Output fields

Keyboard shortcuts

Search operators

Unusual Volume of Password Updated or Removed

MITRE ATT&CK coverage

Rule body kusto

Stages and Predicates

Let binding: threshold

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: summarize

Stage 5: where

Stage 6: extend

Indicators

Output fields

Let binding: `threshold`

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `summarize`

Stage 5: `where`

Stage 6: `extend`