APT / THREAT GROUP
BACKBEND
2
aliases
Last seen:Mar 17, 2026
Intelligence Profile
FireEye describes BACKBEND as a secondary downloader used as a backup mechanism in the case the primary backdoor is removed. When executed, BACKBEND checks for the presence of the mutexes MicrosoftZj or MicrosoftZjBak (both associated with BACKSPACE variants). If either of the mutexes exist, the malware exits.
Threat Analysis
BACKBEND is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.
External References
Quick Facts
TypeAPT / Threat Group
Aliases2
Also Known As
win.backbendBACKBEND
External Intelligence
Malpedia: win.backbendResearch Links
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.