Analytics Story: Clop Ransomware

Date: 2021-03-17 ID: 5a6f6849-1a26-4fae-aa05-fa730556eeb6 Author: Rod Soto, Teoderick Contreras, Splunk Product: Splunk Enterprise Security

Description

Leverage searches that allow you to detect and investigate unusual activities that might relate to the Clop ransomware, including looking for file writes associated with Clope, encrypting network shares, deleting and resizing shadow volume storage, registry key modification, deleting of security logs, and more.

Why it matters

Clop ransomware campaigns targeting healthcare and other vertical sectors, involve the use of ransomware payloads along with exfiltration of data per HHS bulletin. Malicious actors demand payment for ransome of data and threaten deletion and exposure of exfiltrated data.

Detections

Name ▲▼	Technique ▲▼	Type ▲▼
Clop Common Exec Parameter	User Execution	TTP
Clop Ransomware Known Service Name	Create or Modify System Process	TTP
Common Ransomware Extensions	Data Destruction	Hunting
Common Ransomware Notes	Data Destruction	Hunting
Deleting Shadow Copies	Inhibit System Recovery	TTP
High Process Termination Frequency	Data Encrypted for Impact	Anomaly
Process Deleting Its Process File Path	Indicator Removal	TTP
Ransomware Notes bulk creation	Data Encrypted for Impact	Anomaly
Resize ShadowStorage volume	Inhibit System Recovery	TTP
Suspicious Event Log Service Behavior	Indicator Removal, Clear Windows Event Logs	Hunting
Suspicious wevtutil Usage	Clear Windows Event Logs, Indicator Removal	TTP
Windows Event Log Cleared	Indicator Removal, Clear Windows Event Logs	TTP
Windows High File Deletion Frequency	Data Destruction	Anomaly
Windows Service Created with Suspicious Service Path	System Services, Service Execution	TTP

Data Sources

Name ▲▼	Platform ▲▼	Sourcetype ▲▼	Source ▲▼
CrowdStrike ProcessRollup2	N/A	`crowdstrike:events:sensor`	`crowdstrike`
Sysmon EventID 1	Windows	`xmlwineventlog`	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`
Sysmon EventID 11	Windows	`xmlwineventlog`	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`
Sysmon EventID 23	Windows	`xmlwineventlog`	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`
Sysmon EventID 5	Windows	`xmlwineventlog`	`XmlWinEventLog:Microsoft-Windows-Sysmon/Operational`
Windows Event Log Security 1100	Windows	`xmlwineventlog`	`XmlWinEventLog:Security`
Windows Event Log Security 1102	Windows	`xmlwineventlog`	`XmlWinEventLog:Security`
Windows Event Log Security 4688	Windows	`xmlwineventlog`	`XmlWinEventLog:Security`
Windows Event Log System 7045	Windows	`xmlwineventlog`	`XmlWinEventLog:System`

References

Source: GitHub | Version: 1