APT / THREAT GROUP
c99shell
Internal ID: php.c99
1
aliases
Last seen:Mar 17, 2026
Intelligence Profile
C99shell is a PHP backdoor that provides a lot of functionality, for example:
* run shell commands;
* download/upload files from and to the server (FTP functionality);
* full access to all files on the hard disk;
* self-delete functionality.
Threat Analysis
c99shell 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
Aliases1
Also Known As
php.c99
Research Links
Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.