Active Directory Domain Services Elevation of Privilege Vulnerability, CVE-2021-42278

# 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