HOMETHREATSRegretLocker
APT / THREAT GROUP💰 FINANCIALHIGH

RegretLocker

2
aliases
Last seen:Mar 17, 2026

Intelligence Profile

According to PCrisk, RegretLocker is malicious software classified as ransomware. Systems infected with this malware have their data encrypted and users receive ransom demands for decryption. During the encryption process, all affected files are appended with the ".mouse" extension.

Threat Analysis

RegretLocker is a high-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of financial.

Financially motivated threat actors like RegretLocker prioritize monetary gain through methods such as ransomware deployment, banking trojans, cryptocurrency theft, BEC scams, or credential harvesting for resale on underground markets.

With high sophistication, RegretLocker is capable of targeted intrusions using adapted commodity tools alongside custom implants, maintaining operational security and evading standard detection mechanisms.

External References

Quick Facts

TypeAPT / Threat Group
Motivation💰 financial
Sophisticationhigh
Aliases2

Also Known As

RegretLockerwin.regretlocker

External Intelligence

Malpedia: win.regretlocker

Research Links

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.