User joining Zoom meeting from suspicious timezone
Id | 58fc0170-0877-4ea8-a9ff-d805e361cfae |
Rulename | User joining Zoom meeting from suspicious timezone |
Description | The alert shows users that join a Zoom meeting from a time zone other than the one the meeting was created in. You can also whitelist known good time zones in the tz_whitelist value using the tz database name format https://en.wikipedia.org/wiki/List_of_tz_database_time_zones |
Severity | Low |
Tactics | InitialAccess PrivilegeEscalation |
Techniques | T1078 |
Kind | Scheduled |
Query frequency | 1d |
Query period | 14d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/JoiningMeetingFromAnotherTimeZone.yaml |
Version | 1.0.3 |
Arm template | 58fc0170-0877-4ea8-a9ff-d805e361cfae.json |
let schedule_lookback = 14d;
let join_lookback = 1d;
// If you want to whitelist specific timezones include them in a list here
let tz_whitelist = dynamic([]);
let meetings = (
ZoomLogs
| where TimeGenerated >= ago(schedule_lookback)
| where Event =~ "meeting.created"
| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)
| extend SchedTimezone = tostring(parse_json(MeetingEvents).Timezone));
ZoomLogs
| where TimeGenerated >= ago(join_lookback)
| where Event =~ "meeting.participant_joined"
| extend JoinedTimeZone = tostring(parse_json(MeetingEvents).Timezone)
| extend MeetingName = tostring(parse_json(MeetingEvents).MeetingName)
| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)
| where JoinedTimeZone !in (tz_whitelist)
| join (meetings) on MeetingId
| where SchedTimezone != JoinedTimeZone
| project TimeGenerated, MeetingName, JoiningUser=payload_object_participant_user_name_s, JoinedTimeZone, SchedTimezone, MeetingScheduler=User1
| extend timestamp = TimeGenerated, AccountCustomEntity = JoiningUser
triggerOperator: gt
version: 1.0.3
query: |
let schedule_lookback = 14d;
let join_lookback = 1d;
// If you want to whitelist specific timezones include them in a list here
let tz_whitelist = dynamic([]);
let meetings = (
ZoomLogs
| where TimeGenerated >= ago(schedule_lookback)
| where Event =~ "meeting.created"
| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)
| extend SchedTimezone = tostring(parse_json(MeetingEvents).Timezone));
ZoomLogs
| where TimeGenerated >= ago(join_lookback)
| where Event =~ "meeting.participant_joined"
| extend JoinedTimeZone = tostring(parse_json(MeetingEvents).Timezone)
| extend MeetingName = tostring(parse_json(MeetingEvents).MeetingName)
| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)
| where JoinedTimeZone !in (tz_whitelist)
| join (meetings) on MeetingId
| where SchedTimezone != JoinedTimeZone
| project TimeGenerated, MeetingName, JoiningUser=payload_object_participant_user_name_s, JoinedTimeZone, SchedTimezone, MeetingScheduler=User1
| extend timestamp = TimeGenerated, AccountCustomEntity = JoiningUser
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/JoiningMeetingFromAnotherTimeZone.yaml
queryFrequency: 1d
requiredDataConnectors: []
metadata:
source:
kind: Community
author:
name: Pete Bryan
categories:
domains:
- Security - Others
support:
tier: Community
name: User joining Zoom meeting from suspicious timezone
queryPeriod: 14d
severity: Low
kind: Scheduled
tactics:
- InitialAccess
- PrivilegeEscalation
id: 58fc0170-0877-4ea8-a9ff-d805e361cfae
description: |
'The alert shows users that join a Zoom meeting from a time zone other than the one the meeting was created in.
You can also whitelist known good time zones in the tz_whitelist value using the tz database name format https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'
relevantTechniques:
- T1078
triggerThreshold: 0
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/58fc0170-0877-4ea8-a9ff-d805e361cfae')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/58fc0170-0877-4ea8-a9ff-d805e361cfae')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "User joining Zoom meeting from suspicious timezone",
"description": "'The alert shows users that join a Zoom meeting from a time zone other than the one the meeting was created in.\nYou can also whitelist known good time zones in the tz_whitelist value using the tz database name format https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'\n",
"severity": "Low",
"enabled": true,
"query": "let schedule_lookback = 14d;\nlet join_lookback = 1d;\n// If you want to whitelist specific timezones include them in a list here\nlet tz_whitelist = dynamic([]);\nlet meetings = (\nZoomLogs\n| where TimeGenerated >= ago(schedule_lookback)\n| where Event =~ \"meeting.created\"\n| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)\n| extend SchedTimezone = tostring(parse_json(MeetingEvents).Timezone));\nZoomLogs\n| where TimeGenerated >= ago(join_lookback)\n| where Event =~ \"meeting.participant_joined\"\n| extend JoinedTimeZone = tostring(parse_json(MeetingEvents).Timezone)\n| extend MeetingName = tostring(parse_json(MeetingEvents).MeetingName)\n| extend MeetingId = tostring(parse_json(MeetingEvents).MeetingId)\n| where JoinedTimeZone !in (tz_whitelist)\n| join (meetings) on MeetingId\n| where SchedTimezone != JoinedTimeZone\n| project TimeGenerated, MeetingName, JoiningUser=payload_object_participant_user_name_s, JoinedTimeZone, SchedTimezone, MeetingScheduler=User1\n| extend timestamp = TimeGenerated, AccountCustomEntity = JoiningUser\n",
"queryFrequency": "P1D",
"queryPeriod": "P14D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess",
"PrivilegeEscalation"
],
"techniques": [
"T1078"
],
"alertRuleTemplateName": "58fc0170-0877-4ea8-a9ff-d805e361cfae",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
}
],
"entityType": "Account"
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/ZoomLogs/JoiningMeetingFromAnotherTimeZone.yaml",
"templateVersion": "1.0.3"
}
}
]
}