Analytics Story: Ransomware Cloud

Date: 2020-10-27 ID: f52f6c43-05f8-4b19-a9d3-5b8c56da91c2 Author: Rod Soto, David Dorsey, Splunk Product: Splunk Enterprise Security

Description

Leverage searches that allow you to detect and investigate unusual activities that might relate to ransomware. These searches include cloud related objects that may be targeted by malicious actors via cloud providers own encryption features.

Why it matters

Ransomware is an ever-present risk to the enterprise, wherein an infected host encrypts business-critical data, holding it hostage until the victim pays the attacker a ransom. There are many types and varieties of ransomware that can affect an enterprise.Cloud ransomware can be deployed by obtaining high privilege credentials from targeted users or resources.

Detections

Name ▲▼	Technique ▲▼	Type ▲▼
AWS Detect Users creating keys with encrypt policy without MFA	Data Encrypted for Impact	TTP
AWS Detect Users with KMS keys performing encryption S3	Data Encrypted for Impact	Anomaly
O365 SharePoint Malware Detection	Malicious File, User Execution	TTP
O365 Threat Intelligence Suspicious File Detected	Malicious File, User Execution	TTP

Data Sources

Name ▲▼	Platform ▲▼	Sourcetype ▲▼	Source ▲▼
AWS CloudTrail	AWS	`aws:cloudtrail`	`aws_cloudtrail`
AWS CloudTrail CreateKey	AWS	`aws:cloudtrail`	`aws_cloudtrail`
AWS CloudTrail PutKeyPolicy	AWS	`aws:cloudtrail`	`aws_cloudtrail`

References

Source: GitHub | Version: 1