Silk Typhoon Suspicious Exchange Request

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Id	23005e87-2d3a-482b-b03d-edbebd1ae151
Rulename	Silk Typhoon Suspicious Exchange Request
Description	This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by Silk Typhoon actors. The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers. Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
Severity	Medium
Tactics	InitialAccess
Techniques	T1190
Required data connectors	AzureMonitor(IIS)
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/W3CIISLog/SilkTyphoonSuspiciousExchangeRequestPattern.yaml
Version	1.0.3
Arm template	23005e87-2d3a-482b-b03d-edbebd1ae151.json

KQL

let exchange_servers = (
W3CIISLog
| where TimeGenerated > ago(14d)
| where sSiteName =~ "Exchange Back End"
| summarize by Computer);
W3CIISLog
| where TimeGenerated > ago(1d)
| where Computer in (exchange_servers)
| where csUriQuery startswith "t="
| project-reorder TimeGenerated, Computer, csUriStem, csUriQuery, csUserName, csUserAgent, cIP
| extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
| extend AccountName = tostring(split(csUserName, "@")[0]), AccountUPNSuffix = tostring(split(csUserName, "@")[1])

YAML

queryPeriod: 14d
query: |
  let exchange_servers = (
  W3CIISLog
  | where TimeGenerated > ago(14d)
  | where sSiteName =~ "Exchange Back End"
  | summarize by Computer);
  W3CIISLog
  | where TimeGenerated > ago(1d)
  | where Computer in (exchange_servers)
  | where csUriQuery startswith "t="
  | project-reorder TimeGenerated, Computer, csUriStem, csUriQuery, csUserName, csUserAgent, cIP
  | extend HostName = tostring(split(Computer, ".")[0]), DomainIndex = toint(indexof(Computer, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(Computer, DomainIndex + 1), Computer)
  | extend AccountName = tostring(split(csUserName, "@")[0]), AccountUPNSuffix = tostring(split(csUserName, "@")[1])  
name: Silk Typhoon Suspicious Exchange Request
entityMappings:
- fieldMappings:
  - columnName: csUserName
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  entityType: Account
- fieldMappings:
  - columnName: Computer
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: HostNameDomain
    identifier: NTDomain
  entityType: Host
- fieldMappings:
  - columnName: cIP
    identifier: Address
  entityType: IP
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/W3CIISLog/SilkTyphoonSuspiciousExchangeRequestPattern.yaml
requiredDataConnectors:
- connectorId: AzureMonitor(IIS)
  dataTypes:
  - W3CIISLog
description: |
  'This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by Silk Typhoon actors.
  The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers.
  Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'  
kind: Scheduled
version: 1.0.3
metadata:
  author:
    name: Microsoft Security Research
  categories:
    domains:
    - Security - Threat Intelligence
  support:
    tier: Community
  source:
    kind: Community
queryFrequency: 1d
severity: Medium
relevantTechniques:
- T1190
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: 23005e87-2d3a-482b-b03d-edbebd1ae151

ARM