Derusbi
Intelligence Profile
A DLL backdoor also reported publicly as “Derusbi”, capable of obtaining directory, file, and drive listing; creating a reverse shell; performing screen captures; recording video and audio; listing, terminating, and creating processes; enumerating, starting, and deleting registry keys and values; logging keystrokes, returning usernames and passwords from protected storage; and renaming, deleting, copying, moving, reading, and writing to files.
Threat Analysis
Derusbi is a malware family tracked by threat intelligence researchers and catalogued in the Malpedia dataset. It represents a distinct malicious software lineage with identifiable code characteristics, behaviors, and victimology.
The group's espionage-oriented operations suggest a state-sponsored or state-aligned mandate, typically focused on stealing intellectual property, government secrets, or military intelligence. Targets are usually selected for strategic value rather than financial gain.
Classified as an advanced threat actor, Derusbi likely develops or acquires zero-day exploits, employs custom malware toolchains, and demonstrates long-term persistence capabilities — hallmarks of a well-resourced operation consistent with nation-state backing.