O365_Exchange_RecipientPermission_SendAs
ID: 100222
Description:
Add-RecipientPermission SendAs on an Exchange Mailbox - KLK
Repository: Fluency Group: Office365 Type: event
Default Status:
Enabled
| Tags: | |||
|---|---|---|---|
| O365 | Office | Exchange | Mailbox | 
Selector:
Query:
Filters:
Standard:
| Field | MUST hit | 
|---|---|
| @fields.Operation | Add-RecipientPermission | 
| @fields.Workload | Exchange | 
| Field | MUST NOT hit | 
|---|---|
Additional JSON:
function json_doc_filter (doc)
   for i,v in ipairs(doc['@fields'].Parameters)
   do
      
      print(v.Name .. ": " .. v.Value)
      if v.Name == "AccessRights" and v.Value == "SendAs" then
         return true
      end
   end
   return false
end
return json_doc_filter
Behavior Rule:
| Key | Type | Behavior Category | 
|---|---|---|
| @fields.UserId | username | application activity | 
Risks:
| Risks | Base Score | Dimension | 
|---|---|---|
| ALERT_NORMAL | 100 | alert | 
Attributes:
| Alias | Key | 
|---|---|
| IP | @fields.ClientIP | 
| ObjectId | @fields.ObjectId | 
| Operation | @fields.Operation | 
| ISP | @fields._ip.isp | 
| City | @fields._ip.city | 
| Country | @fields._ip.country | 
| UserId | @fields.UserId | 
| ExternalAccess | @fields.ExternalAccess | 
| Identity | @fields.ParametersFields.Identity | 
| Trustee | @fields.ParametersFields.Trustee | 
| AccessRights | @fields.ParametersFields.AccessRights | 
| SubjetUsername | @fields.SubjectUserName | 
| TargetUsername | @fields.TargetUserName | 
| SubjectFullName | @fields.SubjectFullName | 
| TargetFullName | @fields.TargetFullName | 
Correlation Rules:
First Occurrence:
| Name | Window | Fields | 
|---|---|---|
| NewTarget | 30 days | @fields.ObjectId | 
| Risks: | ML_NEW_USER | |
| NewUser | 30 days | @fields.UserId | 
| Risks: | ML_NEW_USER | 
Aggregation:
| Name | Window | Field | AggType | Match | 
|---|---|---|---|---|
| MultipleRecipients | 1 day | @fields.ObjectId | cardinality | gt 1 | 
| Risks: | ALERT_NORMAL | 
History:
| User | Date | 
|---|---|
| ke*y@fluencysecurity.com | 2021 Mar 30 04:26:18 EDT | 
| ke*y@fluencysecurity.com | 2021 Mar 30 08:25:39 EDT | 
| — | 2021 Apr 6 11:17:43 EDT | 
| — | 2021 Apr 6 11:18:54 EDT | 
| ke*y@fluencysecurity.com | 2021 Jun 24 10:25:39 EDT | 
| em*n@fluencysecurity.com | 2021 Jul 6 23:52:45 EDT | 
| ho*d@fluencysecurity.com | 2021 Aug 11 15:44:48 EDT | 
| ho*d@fluencysecurity.com | 2021 Aug 11 16:02:10 EDT | 
| ke*y@fluencysecurity.com | 2021 Sep 13 06:17:15 EDT | 
| ke*y@fluencysecurity.com | 2022 Feb 18 01:05:13 EST | 
This page was automatically created/formatted on Wed, 2022 May 4 21:43:53 EDT, from rule_dump.json (4d88bffdfb1cea26b3985f2193033606)