SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jfmbackdoor (Back to overview)

JFMBackdoor

Actor(s): Calypso


According to PwC Threat Intelligence, JFMBackdoor is a Windows DLL backdoor written in C++ that uses the CppServer library for communication. It is delivered via DLL side-loading and supports extensive capabilities including remote shell access, file system manipulation, network proxying, screenshot capture, registry operations, and self-removal. The malware relies on encrypted configuration files and supports dynamic behavior updates through these configurations. It interacts with system processes generically for actions like shell launching and service management, and uses GDI+ for screenshot capture.

References
2026-05-21PWCPwC Threat Intelligence
Inside Red Lamassu’s JFMBackdoor
JFMBackdoor

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