detection.wiki

Detection rules › Kusto

Alsid user accounts issues

Status
available
Severity
low
Time window
2h
Group by
Severity
Source
github.com/Azure/Azure-Sentinel

'Searches for triggered Indicators of Exposures related to user accounts issues'

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Rule body

id: fb9e0b51-8867-48d7-86f4-6e76f2176bf8
name: Alsid user accounts issues
description: |
    'Searches for triggered Indicators of Exposures related to user accounts issues'
severity: Low
requiredDataConnectors:
  - connectorId: AlsidForAD
    dataTypes:
      - AlsidForADLog_CL
queryFrequency: 2h
queryPeriod: 2h
triggerOperator: gt
triggerThreshold: 0
status: Available
tactics:
  - CredentialAccess
relevantTechniques:
  - T1110
query: |
  let SeverityTable=datatable(Severity:string,Level:int) [
  "low", 1,
  "medium", 2,
  "high", 3,
  "critical", 4
  ];
  let codeNameList = datatable(Codename:string)["C-ACCOUNTS-DANG-SID-HISTORY", "C-PRE-WIN2000-ACCESS-MEMBERS", "C-PASSWORD-DONT-EXPIRE", "C-SLEEPING-ACCOUNTS", "C-DANG-PRIMGROUPID", "C-PASSWORD-NOT-REQUIRED", "C-USER-PASSWORD"];
  afad_parser
  | where MessageType == 0 and Codename in~ (codeNameList)
  | lookup kind=leftouter SeverityTable on Severity
  | order by Level
  | extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))
entityMappings:
  - entityType: Host
    fieldMappings:
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: DnsDomain
version: 1.0.1
kind: Scheduled

Stages and Predicates

Let binding: SeverityTable used in Stage 3

let SeverityTable = datatable(Severity:string,Level:int) [
"low", 1,
"medium", 2,
"high", 3,
"critical", 4
];

Let binding: codeNameList used in Stage 2

let codeNameList = datatable(Codename:string)["C-ACCOUNTS-DANG-SID-HISTORY", "C-PRE-WIN2000-ACCESS-MEMBERS", "C-PASSWORD-DONT-EXPIRE", "C-SLEEPING-ACCOUNTS", "C-DANG-PRIMGROUPID", "C-PASSWORD-NOT-REQUIRED", "C-USER-PASSWORD"];

Stage 1: source

afad_parser

Stage 2: where

| where MessageType == 0 and Codename in~ (codeNameList)

Stage 3: kusto:lookup

| lookup kind=leftouter SeverityTable on Severity

Stage 4: sort

| order by Level

Stage 5: extend

| extend HostName = tostring(split(Host, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Host, '.'), 1, -1), '.'))

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Codenamein
  • codeNameList corpus 12 (kusto 12)
field:"Codename" kind:in value:"codeNameList"
MessageTypeeq
  • 0 corpus 15 (kusto 15)
field:"MessageType" kind:eq value:"0"

Output fields

These fields are emitted when the rule matches.

FieldSource
DnsDomainextend
HostNameextend