The search looks for files that contain the key word Ryuk under any folder in the C drive, which is consistent with Ryuk propagation.
- Type: TTP
Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Last Updated: 2020-11-06
- Author: Rod Soto, Jose Hernandez, Splunk
- ID: 57d44d70-28d9-4ed1-acf5-1c80ae2bbce3
|T1486||Data Encrypted for Impact||Impact|
Kill Chain Phase
- CIS 8
1 2 3 4 5 6 | tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem WHERE "Filesystem.file_path"=C:\\*Ryuk* BY "Filesystem.dest", "Filesystem.user", "Filesystem.file_path" | `drop_dm_object_name(Filesystem)` | `security_content_ctime(lastTime)` | `security_content_ctime(firstTime)` | `ryuk_test_files_detected_filter`
The SPL above uses the following Macros:
Note that ryuk_test_files_detected_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
How To Implement
You must be ingesting data that records the filesystem activity from your hosts to populate the Endpoint Filesystem data-model object. If you are using Sysmon, you will need a Splunk Universal Forwarder on each endpoint from which you want to collect data.
Known False Positives
If there are files with this keywoord as file names it might trigger false possitives, please make use of our filters to tune out potential FPs.
Associated Analytic story
|70.0||70||100||A creation of ryuk test file $file_path$ in host $dest$|
source | version: 1