Sigma rule: Potential Ryuk Ransomware Activity

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-e5e9eb7064f6, updated 2023-02-03T00:00:00.000Z.

Rule

Title: Potential Ryuk Ransomware Activity
Status: stable
Level: high
Author: Florian Roth (Nextron Systems), Vasiliy Burov, Nasreddine Bencherchali (Nextron Systems)
Date: 2019-12-16
Modified: 2023-02-03
File: rules-emerging-threats/2019/Malware/Ryuk/proc_creation_win_malware_ryuk.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects Ryuk ransomware activity

Log source

product: windows
category: process_creation

Detection

selection_reg:
    CommandLine|contains|all:
        - 'Microsoft\Windows\CurrentVersion\Run'
        - 'C:\users\Public\'
selection_del:
    CommandLine|contains|all:
        - 'del /s /f /q c:\'
        - '\*.bac'
        - '\*.bak'
        - '\*.bkf'
selection_net:
    Image|endswith:
        - '\net.exe'
        - '\net1.exe'
    CommandLine|contains|all:
        - ' stop '
        - ' /y'
    CommandLine|contains:
        - 'samss'
        - 'audioendpointbuilder'
        - 'unistoresvc_'
        - 'AcrSch2Svc'
condition: 1 of selection_*

False positives (as the rule lists them)

Unlikely

MITRE ATT&CK ids this rule names

T1547.001

Related rules

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-emerging-threats/2019/Malware/Ryuk/proc_creation_win_malware_ryuk.yml

Sources and licences

SigmaHQ
"Potential Ryuk Ransomware Activity" by Florian Roth (Nextron Systems), Vasiliy Burov, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2019/Malware/Ryuk/proc_creation_win_malware_ryuk.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: Potential Ryuk Ransomware Activity",
entity page, dataset version ref-e5e9eb7064f6, updated 2023-02-03T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/c37510b8-2107-4b78-aa32-72f251e7a844 (accessed 2026-11-03).
Underlying source: SigmaHQ rule c37510b8-2107-4b78-aa32-72f251e7a844, 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.