Backdoor.Win32.Guptachar.20 MVID-2022-0631 Insecure Credential Storage

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/857999d2306f257b80d1b8f6a51ae8b0.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Guptachar.20  
Vulnerability: Insecure Credential Storage  
Description: The malware runs a web server on TCP port 2015 (default) and uses BASIC authentication. The credentials "hacker01:imchampgr8" get stored in a .NFO information file named "GPTCR.NFO" under Windows dir base64 encoded and hidden among many junk NULL bytes.  
Family: Guptachar  
Type: PE32  
MD5: 857999d2306f257b80d1b8f6a51ae8b0  
Vuln ID: MVID-2022-0631  
Dropped files: GPTCR2.exe   
Disclosure: 08/08/2022  
  
Exploit/PoC:  
import base64  
base64.b64decode("aGFja2VyMDE6aW1jaGFtcGdyOA==")  
b'hacker01:imchampgr8'  
  
Web URLs available on the infected host.  
  
http://192.168.18.125:2015/execute.html  
http://192.168.18.125:2015/browse.html  
http://192.168.18.125:2015/upload.html  
http://192.168.18.125:2015/screenshot.html  
http://192.168.18.125:2015/keylog.html  
http://192.168.18.125:2015/display.html  
http://192.168.18.125:2015/shutdown.html  
http://192.168.18.125:2015/servopts.html  
  
  
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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