Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
N/A (single event) |
Deduplication Period |
1 Day |
Required Data |
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Detection Modules |
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Detector Tags |
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ATT&CK Tactic |
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ATT&CK Technique |
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Severity |
Low |
Description
An unusual Encrypting File System Remote call (EFSRPC) was made to a domain controller.
Attacker's Goals
- An attacker can abuse the Encrypting File System Remote Protocol to coerce an authentication from a DC.
- This authentication can later be used for obtaining a DC certificate for DCSync.
Investigative actions
- Check for a suspicious process on the initiator.
- Check if the source host is a vulnerability scanner.
- Check for unusual connections from the server of the requested file location (it may be a relay server).
- Look for unusual AD CS certificate requests.
- Look for following suspicious connections using the DC machine account.
- Check for possible DCSync alerts.