mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
82 lines
3.5 KiB
YAML
82 lines
3.5 KiB
YAML
name: Revil Common Exec Parameter
|
|
id: 85facebe-c382-11eb-9c3e-acde48001122
|
|
version: 3
|
|
date: '2024-05-12'
|
|
author: Teoderick Contreras, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic detects the execution of command-line parameters
|
|
commonly associated with REVIL ransomware, such as "-nolan", "-nolocal", "-fast",
|
|
and "-full". It leverages data from Endpoint Detection and Response (EDR) agents,
|
|
focusing on process execution logs mapped to the `Processes` node of the `Endpoint`
|
|
data model. This activity is significant because these parameters are indicative
|
|
of ransomware attempting to encrypt files on a compromised machine. If confirmed
|
|
malicious, this could lead to widespread data encryption, rendering critical files
|
|
inaccessible and potentially causing significant operational disruption.
|
|
data_source:
|
|
- Sysmon EventID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.process = "* -nolan
|
|
*" OR Processes.process = "* -nolocal *" OR Processes.process = "* -fast *" OR Processes.process
|
|
= "* -full *" by Processes.process_name Processes.process Processes.parent_process_name
|
|
Processes.parent_process Processes.dest Processes.user Processes.process_id Processes.process_guid
|
|
| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
|
|
| `revil_common_exec_parameter_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
known_false_positives: third party tool may have same command line parameters as revil
|
|
ransomware.
|
|
references:
|
|
- https://krebsonsecurity.com/2021/05/a-closer-look-at-the-darkside-ransomware-gang/
|
|
- https://www.mcafee.com/blogs/other-blogs/mcafee-labs/mcafee-atr-analyzes-sodinokibi-aka-revil-ransomware-as-a-service-what-the-code-tells-us/
|
|
tags:
|
|
analytic_story:
|
|
- Ransomware
|
|
- Revil Ransomware
|
|
asset_type: Endpoint
|
|
confidence: 90
|
|
impact: 60
|
|
message: A process $process_name$ with commandline $process$ related to revil ransomware
|
|
in host $dest$
|
|
mitre_attack_id:
|
|
- T1204
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: user
|
|
type: User
|
|
role:
|
|
- Victim
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.parent_process_name
|
|
- Processes.parent_process
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.process_id
|
|
- Processes.process_guid
|
|
risk_score: 54
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/revil/inf1/windows-sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: xmlwineventlog
|