APT / THREAT GROUP
Unidentified 115 (Nim Loader)
2
aliases
Last seen:Mar 17, 2026
Intelligence Profile
According to Walmart, this is a loader written in Nim that contains an AmsiScanBuffer patch followed by a EtwEventWrite patch and that will download/decrypt a payload via AES CFB and inject it into a hardcoded process target (e.g. explorer.exe).
Threat Analysis
Unidentified 115 (Nim Loader) 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
Unidentified 115 (Nim Loader)win.unidentified_115
External Intelligence
Malpedia: win.unidentified_115Research Links
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.