Discovery / credits: Malvuln - (c) 2021  
Original source:  
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 **************├▒I dont like u├▒*************** End **************ÔĽó  
2) Get Sounds  
MSGUnknown commandÔĽóGETSND  
3) Get Installed Software  
MSGUnknown commandÔĽóGETIN2  
GETIN2DESKTOP-2C3IQHO├▒Victim├▒AT/AT COMPATIBLE├▒INTEL - 6040000├▒04/13/18├▒├▒10:36:15 PM├▒1 Hour, 15 Minutes, 19 Seconds.├▒0├▒0├▒0├▒2  
792.64├▒UnknownÔĽóGETIN32146947072├▒951943168├▒-1476931584├▒1274384384├▒2147352576├▒1985863680├▒55├▒65,536├▒10000 - 7FFEFFFF├▒4,096├▒├▒├▒ÔĽó  
GETIN4NTFS├▒c:\├▒A2C9-AD2F├▒85405782016├▒12998012928├▒512├▒8├▒20,851,021├▒3,173,343├▒Fixed├▒CD├▒C: []├▒D: []ÔĽóGETIN6HxD Hex Editor version  
├▒WinPcap 4.1.3├▒WinSCP 5.13├▒Wireshark 2.4.5 64-bit├▒Microsoft Visual C++ 2010 x86 Redistributable - 10.0.30319├▒Microsoft Visual C++ 2008  
Redistributable - x86 9.0.30729.4148├▒Python Launcher├▒Java Auto Updater├▒Microsoft Visual  
4) Get System Info  
├▒-1├▒0├▒1├▒0├▒0├▒0├▒0├▒0├▒no├▒0├▒%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs├▒0├▒0├▒@tzres.dll,-112├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒no├▒no├▒no├▒0├▒  
%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu├▒0├▒0├▒0├▒1├▒%USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start MenuÔĽóRSTR04  
├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒0├▒Application├▒Application Extension├▒MS-DOS Application├▒Windows Batch File├▒0├▒no├▒0├▒0├▒no├▒0  
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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