| عنوان | Backdoor.Win32.Whgrx / Remote Host Header Stack Buffer Overflow |
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| الوصف | Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/eb6fd418cd3b52132ffb029b52839edf.txt
Contact: [email protected]
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: ntd |
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| المصدر | ⚠️ https://www.malvuln.com/advisory/eb6fd418cd3b52132ffb029b52839edf.txt |
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| المستخدم | malvuln (UID 14984) |
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| ارسال | 17/01/2021 03:41 AM (5 سنوات منذ) |
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| الاعتدال | 17/01/2021 09:28 AM (6 hours later) |
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| الحالة | تمت الموافقة |
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| إدخال VulDB | 168059 [Backdoor.Win32.Whgrx HTTP Host Header wsocx.dll تلف الذاكرة] |
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| النقاط | 20 |
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