Remote Encrypting File System Abuse
Detects remote RPC calls to possibly abuse remote encryption service via MS-EFSR
Detection logic
Detection requirements
- Log source product
- rpc_firewall
- Log source category
- application
Known benign triggers
- Legitimate usage of remote file encryption
MITRE ATT&CK mappings
Not mapped to ATT&CK.
References
| Reference | Cited by |
|---|---|
| github.com/jsecurity101/MSRPC-to-ATTACK/blob/ddd4608fe8684fcf2fcf9b48c5f0b3c28097f8a3/documents/MS-EFSR.md | Only this detection cites it |
| github.com/zeronetworks/rpcfirewall | 17 |
| msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942 | Only this detection cites it |
| zeronetworks.com/blog/stopping-lateral-movement-via-the-rpc-firewall/ | 17 |
From the source
- At source
- Open at source
- Upstream identifier
- 5f92fff9-82e2-48eb-8fc1-8b133556a551
- Tagged by the source as
- attack.lateral-movement
Licence
- Published under
- Detection Rule License 1.1Read the licence
- Attribution
- Required
Authorship
- Written by
- Published
- Aug 26, 2026
- Version
- 1