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microsoft_exchange_external_forwarding.yml
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microsoft_exchange_external_forwarding.yml
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AnalysisType: rule
Description: Detects creation of forwarding rule to external domains
DisplayName: "Microsoft Exchange External Forwarding"
Enabled: true
Filename: microsoft_exchange_external_forwarding.py
Reports:
MITRE ATT&CK:
- TA0009:T1114 # Collection - Email Collection
Reference: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/outbound-spam-policies-external-email-forwarding?view=o365-worldwide
Severity: High
Tests:
- ExpectedResult: true
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: Set-Mailbox
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: Identity
Value: ABC1.prod.outlook.com/Microsoft Exchange Hosted Organizations/simpsons.onmicrosoft.com/homer.simpson
- Name: ForwardingSmtpAddress
Value: smtp:hello@familyguy.com
- Name: DeliverToMailboxAndForward
Value: "False"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding Enabled
- ExpectedResult: true
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: New-InboxRule
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: AlwaysDeleteOutlookRulesBlob
Value: "False"
- Name: Force
Value: "False"
- Name: ForwardTo
Value: hello@familyguy.com
- Name: Name
Value: test forwarding
- Name: StopProcessingRules
Value: "True"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding Rule
- ExpectedResult: false
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: New-InboxRule
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: AlwaysDeleteOutlookRulesBlob
Value: "False"
- Name: Force
Value: "False"
- Name: ForwardTo
Value: hello@example.com
- Name: Name
Value: test forwarding
- Name: StopProcessingRules
Value: "True"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding Rule to Allowed Domain
- ExpectedResult: false
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: New-InboxRule
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: AlwaysDeleteOutlookRulesBlob
Value: "False"
- Name: Force
Value: "False"
- Name: ForwardTo
Value: postmaster@example.com
- Name: Name
Value: test forwarding
- Name: StopProcessingRules
Value: "True"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding Rule to Exception
- ExpectedResult: false
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: Set-Mailbox
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: Identity
Value: ABC1.prod.outlook.com/Microsoft Exchange Hosted Organizations/simpsons.onmicrosoft.com/homer.simpson
- Name: ForwardingSmtpAddress
Value: smtp:hello@example.com
- Name: DeliverToMailboxAndForward
Value: "False"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding To Allowed Domain
- ExpectedResult: false
Log:
clientip: 1.2.3.4
creationtime: "2022-12-12 22:19:00"
externalaccess: false
id: 111-22-33
objectid: homer.simpson
operation: Set-Mailbox
organizationid: 11-aa-bb
organizationname: simpsons.onmicrosoft.com
originatingserver: QWERTY (1.2.3.4)
parameters:
- Name: Identity
Value: ABC1.prod.outlook.com/Microsoft Exchange Hosted Organizations/simpsons.onmicrosoft.com/homer.simpson
- Name: ForwardingSmtpAddress
Value: smtp:postmaster@example.com
- Name: DeliverToMailboxAndForward
Value: "False"
recordtype: 1
resultstatus: "True"
userid: homer.simpson@simpsons.onmicrosoft.com
userkey: "12345"
usertype: 2
workload: Exchange
Name: Forwarding to Exception
- ExpectedResult: true
Log:
{
"AppAccessContext": {},
"ClientIP": "20.185.225.251:6688",
"CreationTime": "2023-10-24 13:06:33.000000000",
"ExternalAccess": false,
"Id": "78ab3f60-bd49-42e5-e69d-08dbd4920c3d",
"ObjectId": "28eb696a-03f7-47bd-a07a-b09d5f6e592e",
"Operation": "Set-Mailbox",
"OrganizationId": "18360841-3f87-44a6-8c9a-3ffc680611a0",
"OrganizationName": "fellowship.lotr.com",
"OriginatingServer": "AM6PR0402MB3448 (15.20.6933.008)",
"Parameters":
[
{
"Name": "Identity",
"Value": "28eb696a-03f7-47bd-a07a-b09d5f6e592e",
},
{ "Name": "ForwardingAddress", "Value": "sauron@mordor.dev" },
{ "Name": "ForwardingSmtpAddress", "Value": "" },
{ "Name": "DeliverToMailboxAndForward", "Value": "False" },
],
"RecordType": 1,
"ResultStatus": "True",
"UserId": "saurman@lotr.com",
"UserKey": "10032002CD6B7EFD",
"UserType": 2,
"Workload": "Exchange",
}
Name: Log with ForwardingAddress
DedupPeriodMinutes: 60
LogTypes:
- Microsoft365.Audit.Exchange
RuleID: "Microsoft365.Exchange.External.Forwarding"
Threshold: 1