Sigma rule: Remote Encrypting File System Abuse

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5f8fdfd23873, updated 2022-01-01T00:00:00.000Z.

Rule

Title
Remote Encrypting File System Abuse
Status
test
Level
high
Author
Sagie Dulce, Dekel Paz
Date
2022-01-01
File
rules/application/rpc_firewall/rpc_firewall_efs_abuse.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects remote RPC calls to possibly abuse remote encryption service via MS-EFSR

Log source

product
rpc_firewall
category
application
definition
Requirements: install and apply the RPC Firewall to all processes with "audit:true action:block uuid:df1941c5-fe89-4e79-bf10-463657acf44d or c681d488-d850-11d0-8c52-00c04fd90f7e

Detection

selection:
    EventLog: RPCFW
    EventID: 3
    InterfaceUuid:
        - df1941c5-fe89-4e79-bf10-463657acf44d
        - c681d488-d850-11d0-8c52-00c04fd90f7e
condition: selection

False positives (as the rule lists them)

  • Legitimate usage of remote file encryption

Tags

  • attack.lateral-movement

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/application/rpc_firewall/rpc_firewall_efs_abuse.yml

Sources and licences

  • SigmaHQ

    "Remote Encrypting File System Abuse" by Sagie Dulce, Dekel Paz (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/application/rpc_firewall/rpc_firewall_efs_abuse.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Remote Encrypting File System Abuse",
entity page, dataset version ref-5f8fdfd23873, updated 2022-01-01T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5f92fff9-82e2-48eb-8fc1-8b133556a551 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5f92fff9-82e2-48eb-8fc1-8b133556a551, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.