added wdigest-caching

Credential Access/wdigest-caching.md

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+# Credential harvesting through WDigest cache
+
+This query was originally published in the threat analytics report, *WDigest credential harvesting*.
+
+[WDigest](https://docs.microsoft.com/previous-versions/windows/it-pro/windows-server-2003/cc778868(v=ws.10)?redirectedfrom=MSDN) is a legacy authentication protocol dating from Windows XP. While still used on some corporate networks, this protocol can be manipulated by attackers to dump system credentials.
+
+The Microsoft Security Response Center published an [overview](https://msrc-blog.microsoft.com/2014/06/05/an-overview-of-kb2871997/) of [KB2871997](https://www.catalog.update.microsoft.com/Search.aspx?q=KB2871997), which addresses WDigest use on older platforms. More recent versions of Windows can be protected with a holistic security approach that follows the [principle of least privilege](https://docs.microsoft.com/windows-server/identity/ad-ds/plan/security-best-practices/implementing-least-privilege-administrative-models).
+
+The following query returns any attempts to turn WDigest credential caching on through the registry.
+
+## Query
+
+```Kusto
+​union DeviceRegistryEvents, DeviceProcessEvents
+// Find attempts to turn on WDigest credential caching
+| where RegistryKey contains "wdigest" and RegistryValueName == "UseLogonCredential" and 
+RegistryValueData == "1" or 
+// Find processes created with commandlines that attempt to turn on WDigest caching
+ProcessCommandLine has "WDigest" and ProcessCommandLine has "UseLogonCredential" and 
+ProcessCommandLine has "dword" and ProcessCommandLine has "1"
+| project Timestamp, DeviceName, PreviousRegistryValueData,  
+RegistryKey, RegistryValueName, RegistryValueData, FileName, ProcessCommandLine, 
+InitiatingProcessAccountName, InitiatingProcessFileName, 
+InitiatingProcessCommandLine, InitiatingProcessParentFileName
+```
+
+## Category
+
+This query can be used to detect the following attack techniques and tactics ([see MITRE ATT&CK framework](https://attack.mitre.org/)) or security configuration states.
+
+| Technique, tactic, or state | Covered? (v=yes) | Notes |
+|-|-|-|
+| Initial access |  |  |
+| Execution |  |  |
+| Persistence |  |  |
+| Privilege escalation |  |  |
+| Defense evasion |  |  |
+| Credential Access | v |  |
+| Discovery |  |  |
+| Lateral movement |  |  |
+| Collection |  |  |
+| Command and control |  |  |
+| Exfiltration |  |  |
+| Impact |  |  |
+| Vulnerability | v |  |
+| Misconfiguration |  |  |
+| Malware, component |  |  |
+
+## Contributor info
+
+**Contributor:** Microsoft Threat Protection team