HOMETHREATScd00r
APT / THREAT GROUP

cd00r

2
aliases
Last seen:Mar 17, 2026

Intelligence Profile

A backdoor for UNIX operating systems that implements knocking as authentication method.

Threat Analysis

cd00r 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://github.com/aaaaaaaannn/cd00r.c/blob/master/cd00r.c
→https://www.giac.org/paper/gcih/342/handle-cd00r-invisible-backdoor/103631

Quick Facts

TypeAPT / Threat Group
Aliases2

Also Known As

cd00relf.cd00r

External Intelligence

Malpedia: elf.cd00r

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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