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)