Merge pull request #435 from microsoft/MDI-CVE-2021-42278

Create SAM-Name-Changes-CVE-2021-42278

Privilege escalation/SAM-Name-Changes-CVE-2021-42278.md

@@ -0,0 +1,45 @@
+# Active Directory Domain Services Elevation of Privilege Vulnerability, CVE-2021-42278
+
+The following query detects possible CVE-2021-42278 exploitation by finding changes of device names in the network using Microsoft Defender for Identity
+## Query
+
+```Kusto
+IdentityDirectoryEvents
+| where Timestamp > ago(1d)
+| where ActionType == "SAM Account Name changed"
+| extend FROMSAM = parse_json(AdditionalFields)['FROM SAM Account Name']
+| extend TOSAM = parse_json(AdditionalFields)['TO SAM Account Name']
+| where (FROMSAM has "$" and TOSAM !has "$") 
+        or TOSAM in ("DC1", "DC2", "DC3", "DC4") // DC Names in the org
+| project Timestamp, Application, ActionType, TargetDeviceName, FROMSAM, TOSAM, ReportId, AdditionalFields
+```
+
+## 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 | v |  |
+| Defense evasion |  |  |
+| Credential Access |  |  |
+| Discovery |  |  |
+| Lateral movement |  |  |
+| Collection |  |  |
+| Command and control |  |  |
+| Exfiltration |  |  |
+| Impact |  |  |
+| Vulnerability | v |  |
+| Misconfiguration |  |  |
+| Malware, component |  |  |
+
+## See also
+
+* [Active Directory Domain Services Elevation of Privilege Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42278)
+
+## Contributor info
+
+**Contributor:** Microsoft Defender for Identity team