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Archive for the ‘forensics’ Category

Turning USB peripherals BadUSB (A confession……)

08 Aug

There is currently a ‘stink’ about this article:

Turning USB peripherals into BadUSB

These guys appear to have put a quite an amount of research into this subject and attack vector.
However I’m disappointed about how little research and citations of prior work they seem to have included, even if it is not based around USB devices it is still relevant.
Then there is the ‘case’ of the 3rd party publicly available code to reprogram the SAME USB device released BEFORE their presentation.

For Example:
On Hacking MicroSD Cards

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USB Storage devices – embedded Trojan analysis/implementation (USB Nand-Flash)

04 Aug

How we can build powerful analysis tools from Ebay crap….

There is lots of cool scrap available on Ebay, specifically items from video processing companies/telecom companies that sold their scrap to clowns who were supposed to ‘destroy it’ ( you know the ones, who advertise ‘secure destruction’ of equipment).
All you need is a JTAG pod, frequency generator (NE555), multi-tester and a little bit of time.

Background
Back In Jan I threw together a library for reading Nand-flash chips on the Arduino, part of the reason for this was to try to throw together a simple and highly cost-effective way to read Nand-flash chips.

Unfortunately it was a failure due to the read speeds…. BUT….
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USB miners and the Dipo Electronic 19 port 20A USB Hub

20 Nov

This is a 19 port hub with an integral power supply that is capable of reliably supplying MORE than 700mA per port without overheating or becoming a fire hazard.

Dipo  hub , with engineering modifications for reliability

Dipo hub , with engineering modifications for reliability

Some of the Basic specifications:

– Fully 480mb/s at each port
– 16 Front facing Standard A USB ports
– 3 Side facing Standard A
– 1 Master hub connection Standard B for connection to Computing Equipment or other hubs
– Fully fused internally via multiple poly-fuse resettable fuses both on each individual port and on the main power feed to the Ports.
– UK/European standard 3 pin power plug
– Hub runs COOL

Unlike cheaper USB ports that only implement links at USB 1.0 standard (12mb/s speeds but state they are ‘compatible’ with USB 2.0) this is a professional FULL 480 Mb/s port that complies and implements the full 2.0 USB standard. It may also be used to connect to generic USB 1.0 equipment.

The good thing about these hubs is that you can load them up with 19 Bi-Fury miners (around 76 gh/s) and the miners would STILL run as intended.

The supplier is a Chinese company we have been working with, each hub we sell is inspected both at the electrical and electronic levels to ensure the correct functionality of the product.

It can be purchased here:
Razorfishsolutions.com.hk

 
Comments Off on USB miners and the Dipo Electronic 19 port 20A USB Hub

Posted in Android, Arduino, BITCOIN, forensics, FPGA, Linux, PCB Design, Reverse Engineering

 

Bit coin miner from Ebay scrap D’oh!!!!(VII)

09 Jul

Its Always good to take a look at past work…

Inparticular the VHDL…. hay it looks ok so it MUST be ok…
FPGA

When I say look at it, I mean from a totally different perspective…
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Bit coin miner from Ebay scrap (VI)

30 Jun

One major issue with generating bitcoins is getting rid of the heat from the crypto hashing engines. This is partially due to poor design of many of the crypto engines, or the incessant need of miners to over-clock the rigs until the errors are in double figures….
However many Bitcoin miners do not take into account the ambient temperature when designing their cooling solutions( and some cooling solutions are just CRAP… blue flashing lights anyone?, radioactive coolant?…. but ..but. is green and it glows in the dark…yep… chicks just dig flashy lights and green coolant.)
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Bit coin miner from Ebay scrap (V)

25 Jun

Nope … we have not ‘given up’
In fact we have made some excellent progress
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Bit coin miner From Ebay scrap (IV)

18 Jun

Overall the results from using the Ebay scrap were positive

The boards are a little long making programming via JTAG difficult, not to mention the 14 Pin IDC connector is not really suitable for a standard 14 pin IDC plug (a fact I discovered AFTER I returned from China with a bag full of parts).

20130618_122614















As we can see it is a little cramped by the JTAG connector (directly inline with a fan), yep I can say officially that even a 12 Volt fan is capable of doing serious damage to finger tips and finger nails.

Caveats

There were a number of issues with the FORA(For-a) video processing boards.

  • After digging about we find that the FPGA core voltage has been fixed at 0.97v
    This is a little low for proper mining
  • We had to strip out an additional component that supported the PCI bus as the part was running from the 3V3 supply.
    Failure to remove it would be driving the chip at 170% of its rating thereby forcing it to dump several hundred mA as heat…
  • Yep We had an Idea that there was something shitty about the power-supply setup…
    The Bellinix modules used are ‘programmable’ via an external sense resistor, problem was that when we replaced the sense resistor NOTHING happened to the supply voltage, in fact completely removing the sense resistor also had no effect.
    * UPDATE 29Th June 2013, we finally tracked this down to a defective Bellinix module…
    We can now adjust the core voltage for the FPGA via a system that reprograms the DC/DC PSU module.