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Author Topic: Avast deleted block blk00129.dat from my chainlist  (Read 288 times)
cryptojor
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August 25, 2019, 08:40:27 AM
 #1

Hi everybody! During monitoring Avast suspected and deleted block blk00129.dat from my chain saying that this is kind of virus (AntiCad-4096). Now when I start bitcoin core I need to start download all blocks from the begginning. Maybe someone can upload this block on some shared file exchange platform like depositfiles.com? It's about 130 MG, not so big size.
Or maybe you tell me how to solve this problem. Any help will be appreciated.
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August 25, 2019, 08:49:51 AM
 #2

Add Bitcoin data directory to exclusions. Check if that block has been moved to quarantine. You might be able to recover it. Here is the reason why Avast was triggered.

It's actually not because of randomness. People have been intentionally embedding viruses (or their signatures) in the blockchain so that antivirus software are triggered.

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August 25, 2019, 08:58:28 AM
 #3

Add Bitcoin data directory to exclusions. Check if that block has been moved to quarantine. You might be able to recover it. Here is the reason why Avast was triggered.

It's actually not because of randomness. People have been intentionally embedding viruses (or their signatures) in the blockchain so that antivirus software are triggered.

Unfortunately it cannot be recovered from quarantine or any other place from my PC.
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August 25, 2019, 09:03:47 AM
 #4

I've checked this before, and block files are not (exactly) the same for different systems. So you can't just replace one file.

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August 25, 2019, 01:36:54 PM
 #5

Unfortunately it cannot be recovered from quarantine or any other place from my PC.

As a generic rule, quarantine should be one folder and the file should be there, but with a different name. And looking by content may not help. However, since you know the size, you would have to copy the file to the original location. (Of course, the first step is to whitelist the folder. @BitCryptex already wrote that.) Also there's a tutorial on Avast Quarantine on their website.

If the file is not there, maybe it was deleted. In this case, for your safety, the best is re-download with Bitcoin Core.





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.




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August 25, 2019, 01:47:08 PM
 #6

Add the folder to your exclusions. Have you checked the screen where avasr said it was deleted? On my antivirus (symantec) thee is a recover function.

Run bitcoin core again after adding the exclusion, it'll be the virus signatures added around 2014 if I remember rightly there...

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August 25, 2019, 04:40:01 PM
Last edit: August 26, 2019, 06:43:03 PM by ETFbitcoin
 #7

blkxxxxx.dat of each users isn't exactly same, so you simply can't copy one of them to your Bitcoin directory.
You must copy the entire folder from another user or sync from the beginning.

For sake of reference, check :
How to manually verify blk*.dat and rev*.dat files?
Differing .dat file sizes on Pi node vs. Windows nodes

It's actually not because of randomness. People have been intentionally embedding viruses (or their signatures) in the blockchain so that antivirus software are triggered.

Unfortunately it cannot be recovered from quarantine or any other place from my PC.

I used Avast previously to help friends and all infected/dangerous files are quarantine by default.

Do you mean it's not available on quarantine list, which means it's above quarantine limit size?

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August 25, 2019, 04:57:09 PM
 #8

Hi everybody! During monitoring Avast suspected and deleted block blk00129.dat from my chain saying that this is kind of virus (AntiCad-4096). Now when I start bitcoin core I need to start download all blocks from the begginning. Maybe someone can upload this block on some shared file exchange platform like depositfiles.com? It's about 130 MG, not so big size.
Or maybe you tell me how to solve this problem. Any help will be appreciated.



You want to do the full install again, I'd not trust anyone sending me a 'block' to fix this, especially if you have crypto in the wallet of any amount.

You have to delete the BTC wallet and blockchain and re-install Bitcoin Core 18.0 I think it is now.

When you run Avast! it comes up as a virus which means you have to have that as an 'exception' and then it the virius checker moves on.

Do the same for any other triggered blocks by Avast!

You can try just updating over the top of the current install for the heck of it

save your backup/.dat file. I never have any BTC on my Computer Wallet. All goes to a paper wallet or Trezor for 'dust stuff'

Might be better to do this install on a different computer and just import the the backup .dat file.

Not a big deal, IF, you move stuff right away off of the wallet program to whatever.

I also don't leave any BTC on any exchanges at all. As a scary example of these rules, I moved BTC of Cryptopia like days before it went Kerplunk!

Thus, reinforced my lesson on that as well. Move your dust to a Trezor always and move your HODL stuff to a paper wallet for the big stuff

and just do above when checking your computer etc for using your laptop computer or whatever on Coinbase and take no more time than

it takes to move the stuff thru Coinbase or to a paper wallet or Trezor or whatever.

I keep spare Trezor codes and paper wallets in a bank safety deposit box with my brother as beneficiary ... I figure if  meteorite takes out the bank

safety deposit box at the bank the ASIC gods never wanted me to succeed at Bitcoin anyway.

Anyway, again, with an empty wallet and/or backup .dat on a complete install on using Avast! above with the stuff that comes up as an exception

I've not had any problems. But again, my wallet is always empty if it breaks in the above manner, I always back up dust and quite frankly anything

I get dust of otherwise goes to my BTC address in the safety deposit box for my Long term HODL plans, so I'm not tempted to spend any.

Hope this helps

Brad

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August 25, 2019, 06:37:41 PM
 #9

That sucks mate... you can also try using one of the trusted data recovery software available online like Recuva. This way you might be able to recover the exact file that was deleted.

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August 25, 2019, 10:15:21 PM
 #10

That sucks mate... you can also try using one of the trusted data recovery software available online like Recuva. This way you might be able to recover the exact file that was deleted.


from my understanding, all he has to do is re-install from day one of the blockchain from 2009.

pain, but do'able with his backup dat file.

or at least I think that is the case, what happens on my Avast! unless when it comes up as virus I simply hit the exception on such.

Let me know if I'm utterly wrong on this.

Again, my wallets are always empty so I've no skin in the game above on doing such

Brad

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August 27, 2019, 01:53:13 AM
 #11

That sucks mate... you can also try using one of the trusted data recovery software available online like Recuva. This way you might be able to recover the exact file that was deleted.


from my understanding, all he has to do is re-install from day one of the blockchain from 2009.

pain, but do'able with his backup dat file.

or at least I think that is the case, what happens on my Avast! unless when it comes up as virus I simply hit the exception on such.

Let me know if I'm utterly wrong on this.

Again, my wallets are always empty so I've no skin in the game above on doing such

Brad


One could always delete anything past the file that's been deleted/corrupted, so in this case blk00129.dat and anything past that and matching .rev files, as well as all chainstate files, and go from tere, however since blk00129.dat out of the current blk01700.dat+.. you aren't saving that much time. I would play it safe and do a sync from scratch, but knowing that is useful if the affected file is a recent one.

While you are at it, tell us your setup so I can include the sync time with your hardware in teh database that im doing (I need your hardware and internet connection).
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August 27, 2019, 05:15:12 AM
 #12

That sucks mate... you can also try using one of the trusted data recovery software available online like Recuva. This way you might be able to recover the exact file that was deleted.

Looks like the process to rebuild database (which means older blk00129.dat won't be compatible) and download whole blockchain already started, so i think it's already too late.

It's different case if Bitcoin Core isn't opened after blk00129.dat is removed by Avast and blk00129.dat is recovered without any corruption.

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August 27, 2019, 05:47:37 AM
 #13

@cryptojor

anti-virus is a pointless waste of space, just delete the av program


in the days when updating your system over the internet was unheard of, computer viruses sometimes did spread. in practice, they were still rare.


now, there are no malware threats that cannot be mitigated by simply choosing a secure operating system, and keeping it up to date. I've been doing exactly that for 10 years, any virus worth a damn would have stolen some of my BTC, and that hasn't happened.

Vires in numeris
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