APT / THREAT GROUP

DOUBLEBACK

aliases

Last seen:Mar 17, 2026

Intelligence Profile

DOUBLEBACK is a newly discovered fileless malware deployed as part of an attack campaign that took place in December 2020. The threat actors responsible for the operations are tracked as UNC2529 by researchers. According to their findings, DOUBLEBACK is the final payload delivered onto the compromised systems. Its task is to establish and maintain a backdoor on the victim's machine.

Threat Analysis

DOUBLEBACK is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

External References

→https://research.loginsoft.com/threat-research/from-innocence-to-malice-the-onenote-malware-campaign-uncovered/

→https://www.fireeye.com/blog/threat-research/2021/05/unc2529-triple-double-trifecta-phishing-campaign.html

Quick Facts

TypeAPT / Threat Group

Aliases2

Also Known As

win.doublebackDOUBLEBACK

External Intelligence

Malpedia: win.doubleback

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

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

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