Threat Actors grief

grief

TLP:CLEAR

Active

Kill Chain Analysis Generate Graph Hunt Package

Description

Doppelpaymer is a ransomware family that encrypts user data and later on it asks for a ransom in order to restore original files. It is recognizable by its trademark file extension added to encrypted files: .doppeled. It also creates a note file named: ".how2decrypt.txt". Known victims: 3 1 ransom note(s) on file

Goals & Targeting

Objectives

Ransomware

Financial Gain

AI Analysis

· 1 week ago

Executive Summary

Grief, a threat actor associated with the Doppelpaymer ransomware, is a moderately sophisticated cybercriminal group focused on financial gain through ransomware operations. They encrypt victim data and demand ransoms for decryption keys, targeting various industries with campaigns observed between May 2021 and June 2021.

Goals & Targeting

Grief's primary strategic objective is to generate profits through ransom payments. They target sectors with high organizational continuity requirements, such as healthcare, education, and manufacturing. Their global reach suggests they may focus on regions with weaker cybersecurity defenses or industries known for significant financial losses when disrupted.

Enhanced Description

Grief operates as part of the Doppelpaymer ransomware family, which is characterized by its unique file extension '.doppeled' after encryption. The group leaves a plaintext note named '.how2decrypt.txt' to instruct victims on paying the ransom. While specifics about their targeting are limited, their operational period and known tools suggest a focus on financial gain through large-scale campaigns, often leveraging sophisticated yet common techniques for initial access, lateral movement, and data exfiltration.

Key Capabilities

Ransomware deployment
Lateral movement within networks
Data encryption for extortion

MITRE ATT&CK Tactics

Initial Access

Execution

Lateral Movement and Access Expansion

Defense Evasion

Data Exfiltration

ATT&CK Techniques

T1059.003

T1055

T1021

T1566.001

Software / Tooling

Doppelpaymer ransomware

Campaigns & Victims

Grief's campaigns are characterized by their use of Doppelpaymer for encryption and their ability to create and distribute malicious payloads. While specific campaign details are limited, they are known to target vulnerable sectors through spear-phishing emails with malicious links.

IOC Patterns

Spear-phishing emails with malicious Office documents
Encrypted files with '.doppeled' extension
Presence of '.how2decrypt.txt' note

Recommended Actions

Enhance email filtering to detect and block phishing attempts
Implement endpoint detection and response (EDR) solutions
Conduct regular cybersecurity awareness training for employees
Monitor dark web activity for leaked data or ransomware discussions

Suggested Tags

ransomware

cybercrime

financial-gain

Confidence Assessment

Confidence in Grief's intelligence is moderate. While Doppelpaymer's operations are well-documented, gaps exist regarding specific targets, TTPs, and the full scope of their activities.