Backdoor.Win32.NerTe.772 Code Execution

Backdoor.Win32.NerTe.772 malware suffers from a code execution vulnerability.

MD5 | a9370f85e3b72ca57a311664a057df8f

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

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

1) Get Clipboard data.

GETCLB*************** Clipboard **************ñI dont like uñ*************** End **************╢

2) Get Sounds

MSGUnknown command╢GETSND

3) Get Installed Software

MSGUnknown command╢GETIN2
GETIN2DESKTOP-2C3IQHOñVictimñAT/AT COMPATIBLEñINTEL - 6040000ñ04/13/18ññ10:36:15 PMñ1 Hour, 15 Minutes, 19 Seconds.ñ0ñ0ñ0ñ2
792.64ñUnknown╢GETIN32146947072ñ951943168ñ-1476931584ñ1274384384ñ2147352576ñ1985863680ñ55ñ65,536ñ10000 - 7FFEFFFFñ4,096ñññ╢
GETIN4NTFSñc:\ñA2C9-AD2Fñ85405782016ñ12998012928ñ512ñ8ñ20,851,021ñ3,173,343ñFixedñCDñC: []ñD: []╢GETIN6HxD Hex Editor version
ñWinPcap 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

4) Get System Info

ñ-1ñ0ñ1ñ0ñ0ñ0ñ0ñ0ñnoñ0ñ%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu\Programsñ0ñ0ñ@tzres.dll,-112ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñnoñnoñnoñ0ñ
%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menuñ0ñ0ñ0ñ1ñ%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu╢RSTR04
ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñApplicationñApplication ExtensionñMS-DOS ApplicationñWindows Batch Fileñ0ñnoñ0ñ0ñnoñ0

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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