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Looks for activity that might indicate exploitation of the ProxyToken vulnerability - CVE-2021-33766 Ref: https://www.zerodayinitiative.com/blog/2021/8/30/proxytoken-an-authentication-bypass-in-microsoft-exchange-server
| Attribute | Value |
|---|---|
| Type | Hunting Query |
| Solution | GitHub Only |
| ID | 141a3be6-be08-4519-9698-2fc908f6761c |
| Tactics | InitialAccess |
| Techniques | T1190 |
| Required Connectors | AzureMonitor(IIS) |
| Source | [View on GitHub](https://github.com/Azure/Azure-Sentinel/blob/master/Hunting Queries/W3CIISLog/SuspectedProxyTokenExploitation.yaml) |
This content item queries data from the following tables:
| Table | Selection Criteria | Transformations | Ingestion API | Lake-Only |
|---|---|---|---|---|
W3CIISLog |
cIP !startswith "127."cIP !startswith "::"cIP !startswith "fe80"csCookie has "SecurityToken"csMethod == "POST"csUriQuery has "msExchEcpCanary"csUriStem has "/ecp" |
✓ | ✗ | ✗ |
The following connectors provide data for this content item:
| Connector | Solution |
|---|---|
| ESI-Opt5ExchangeIISLogs | Microsoft Exchange Security - Exchange On-Premises |
Solutions: Microsoft Exchange Security - Exchange On-Premises
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