Avast WEBforum
Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: jvidal on December 24, 2015, 01:04:23 AM
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Hi!
These last few months, I've stumbled upon several people affected by the teslacrypt family of ransomware viruses. All of them had Avast on their computers, which didn't detect it AT ALL.
What is going on? why isn't avast detecting this INCREDIBLY DANGEROUS virus?????
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1]
It is not a virus but ransomware.
2]
avast does detect many variants of TeslaCrypt.
3]
There is not tool that detects all malware.
4]
Many people have pup detection disabled in avast.
TeslaCrypt is (amongst other ways) spread through pup's.
5]
Detection can only be added if avast (and other malware vendors/developers) have a sample of the malware.
Doctors can't develop a cure for a decease that the don't know the existents of. ;)
6]
I have to guess here, but those people are using a account with administrator rights for daily use.
That means that if malware gets on the system it has the same rights as the user.
NEVER use a account with administrator rights for daily use.
Security on/for a system starts with what the user knows/does, not with software.
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are you for real????
Not a virus????? yeah, right.
Avast hasn't detected ANY variant of teslacrypt, alphacrypt or cryptolocker/cryptowall so far.
I know it can't detect all malware, but at least it should detect some of it!!!
Maybe PUP is disabled by default, it still should detect ransomware viruses even if pup detection is not enabled. This is not a valid excuse.
Probably they use an admin-enabled accout, but they have their reasons. Limited accounts won't allow you to do a lot of necessary things.
Oh, and BTW, Avast flags the tesladecoder tool used to try and decrypt the files as a virus, but not the actual virus. Neat!
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Yes, I am for real.
It is not a virus, but ransomware.
A virus is just one of the (many) types of malware.
Some others are : trojan, adware, scareware
avast sure has detected several variants of ransomware.
You can check the vps history what avast is detecting.
https://www.avast.com/virus-update-history
Keep in mind that different vendors often have different naming for the same malware.
Saying avast detects the TeslaCrypt encoder as malware isn't much helpful.
Which exact decoder do you mean ?
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Not a virus????? yeah, right.
all virus are malware, but all malware are not virus. If it does not self-replicate it is not a virus
quote VB100
In a stricter sense 'virus' applies only to self-replicating malware, and even more specifically only to code which infects other files on the local system
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As addition.
A virus attaches itself to the end of a file, not changing the rest of the file.
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As addition.
A virus attaches itself to the end of a file, not changing the rest of the file.
end/beginning depends on what version, there are also space filler variants (cavity injectors)
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Avast hasn't detected ANY variant of teslacrypt, alphacrypt or cryptolocker/cryptowall so far.
No ::) well a quick google search give this
Teslacrypt
https://www.virustotal.com/nb/file/21fd3ae9ad43d66dafb94aab22d985d44805df86912882476d840110ab1347f1/analysis/
Alphacrypt
https://www.virustotal.com/nb/file/7bdc23cc435305da225148b643fc5273a0bf4e227327e15309fe8d5d98c12c20/analysis/
https://www.virustotal.com/nb/file/10cefc780480238a0072c34b4d43571321db91eeb4fc36b1c8ceb5dd7d7aaab1/analysis/
Cryptolocker
https://www.virustotal.com/nb/file/a2bc3059283d7cc7bc574ce32cb6b8bfd27e02ac3810a21bd3a9b84c17f18a72/analysis/
Cryptowall
https://www.virustotal.com/nb/file/45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d/analysis/
https://www.virustotal.com/nb/file/55e866cc8580e5f9f7f6560e478f3b37b3362e9f94e88439beef6026c86c80be/analysis/
https://www.virustotal.com/nb/file/45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d/analysis/
What is going on? why isn't avast detecting this INCREDIBLY DANGEROUS virus?
New changed versions are frequently released to avoid detection
Oh, and BTW, Avast flags the tesladecoder tool used to try and decrypt the files as a virus, but not the actual virus. Neat!
It is normal that tools used to clean malware are detected bc of how they behave, happens frequently with all the tools used by this forums malware removal team
https://www.virustotal.com/nb/file/84b86bd83929a9bda1d114a0df9361a8a51d38af27a60879fd405af4477263f3/analysis/1450954969/
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Hello, I just have a friend with avast running and up to date (11.1.2245 with data base 160122-0) that have been infected by cryptowall 4.0 to day.
He have a backup done every week on an usb drive, so it should be ok to restore his file.
But now the question is to know if there is a way to have a good protection against this kind of malware ?
Because avast still running on his PC without seing or doing anything against cryptowall 4.0 :-(
It seems malwarebytes can see it, I will do a scan with it.
Hope you will be able to work on a protection again this type of malware.
Bests regards,
Vincent (from France)
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Hello, I just have a friend with avast running and up to date (11.1.2245 with data base 160122-0) that have been infected by cryptowall 4.0 to day.
He have a backup done every week on an usb drive, so it should be ok to restore his file.
But now the question is to know if there is a way to have a good protection against this kind of malware ?
Because avast still running on his PC without seing or doing anything against cryptowall 4.0 :-(
It seems malwarebytes can see it, I will do a scan with it.
Hope you will be able to work on a protection again this type of malware.
Bests regards,
Vincent (from France)
Do you need assistanse from Malware removal team?
if so, follow instructions here https://forum.avast.com/index.php?topic=53253.0
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Hello,
samples that we have are already detected. Maybe this is some new variant, which is not covered by any our generic detection. We would like to have such samples to analyze.
Can you send us the malware samples to analyze why it was not detected? Create a ticket on https://support.avast.com/ and attach the samples, please.
Thank you,
Milos
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quick question. how do you avoid ransomware and prevent it to begin with? is it something hackers install directly to your pc through hacking or is it by clicking bad/infected links?
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quick question. how do you avoid ransomware and prevent it to begin with? is it something hackers install directly to your pc through hacking or is it by clicking bad/infected links?
https://www.foolishit.com/cryptoprevent-malware-prevention/ (https://www.foolishit.com/cryptoprevent-malware-prevention/)
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how do i know if cryptoprevent is working? as there doesnt seem to be any toolbar icon
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how do i know if cryptoprevent is working? as there doesnt seem to be any toolbar icon
This explains how it works and why you don't need any toolbars icons etc.
http://www.bleepingcomputer.com/forums/t/525028/cryptoprevent-does-it-work/page-2#entry3619786 (http://www.bleepingcomputer.com/forums/t/525028/cryptoprevent-does-it-work/page-2#entry3619786)
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thanks so its all in the registries then. I just hope it doesnt affect anything legit i try and install at later dates
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Imho Avast should implement some specific kind of cryptoware prevention as Bitdefender did in their latest version. Recently I'm seeing too many samples of this kind of malware missed by Avast. It is true you can install something like cryptoprevent, but however Avast should offer better protection by itself.
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Imho Avast should implement some specific kind of cryptoware prevention as Bitdefender did in their latest version. Recently I'm seeing too many samples of this kind of malware missed by Avast. It is true you can install something like cryptoprevent, but however Avast should offer better protection by itself.
You seem to forget that the infection or Malware always comes first and protection comes second. It's always a catch up game.
The first part of staying safe starts with your own ability not to click on every link you see. That may be a bit blunt but, most people are their own worst enemies.
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I totally agree with you, but why Avast can't implement a defence mechanism like cryptoprevent or bitdefender cryptowall immunizer? It shouldn't be so hard...
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No arguments. I agree but,that's a question for Avast to answer. :)
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It shouldn't be so hard...
If it wouldn't be so hard, every av vendor (and others) would already have created the perfect protection against it.
The largest problem is that users don't know nor bother to learn how to handle a computer (hardware/software) even near decent when it comes to security.
I would be very rich in a real short time if e.g. everyone who is using a account with administrator rights while there is no need for it give me $0,01 each time they do so.
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Hello,
yes, we have some ideas. They are waiting for implementation and testing.
Milos
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Hello,
yes, we have some ideas. They are waiting for implementation and testing.
Milos
Thanks for the reply.
(Buying FoolishIT would make it quicker. :) )
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Hello,
yes, we have some ideas. They are waiting for implementation and testing.
Milos
Thank you! This is a good news.
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Just out of curiosity - shouldn't Deepscreen pickup any ransomware? With the ransomware starts, Avast should Deepscreen it and watch what it's doing to the virtual environment. Once it sees cryptography going on, it warns the user that it may be unsafe - the user can then terminate it.
Or am I off base on that?
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Hello,
yes it should, but not every ransomware encrypt files immediately after execution.
Milos
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In addition to what Milos said.
No mather what part of avast is used to detect the encryption malware,
there is also the "problem" that it shouldn't react on legitimate encryption tools like (e.g.) GNU privacy Guard and 7zip
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I can confirm that.
Avast completely ignored Teslacrypt and other Ransomware. For last two months I have four confirmed cases with different clients running AVAST PRO. The last one is from yesterday. Not detected Teslacrypt 3, even after files being encrypted with extension mp3. All info is gone !!!
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You are wrong.
avast doesn't completely ignore encryption malware.
It can and will detect certain versions of it as has already been told.
Sure there is always room for better detection and as Milos said, avast is already working on it.
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We had a customer yesterday where Avast Endpoint Protection Suit Plus, failed to detect TeslaCrypt, thus infecting one PC and encrypting all data stored on the company's server shared data. Thank god there was a backup!
Why did this malware not get detected?
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Why did this malware not get detected?
Read this and other threads and you will know.
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We had a customer yesterday where Avast Endpoint Protection Suit Plus, failed to detect TeslaCrypt, thus infecting one PC and encrypting all data stored on the company's server shared data. Thank god there was a backup!
Why did this malware not get detected?
There is always a lag between a new infection or a new variant of an older infection and the time that it's deleted.
There is no Perfect AV ! The infection always comes first and the detection always lags behind.
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Hello,
do you have TeslaCrypt malware files to analyze?
Milos
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Yes we still have the email that it originated from.
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Upload attachment to virustotal.com if scanned before click rescan for a fresh result
Post link to scan result here
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The scan result is here: https://www.virustotal.com/en/file/1c26e59f92978f9971f1ea250752089869285e4ea375d02cf567138f110365e0/analysis/1457095059/
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The scan result is here: https://www.virustotal.com/en/file/1c26e59f92978f9971f1ea250752089869285e4ea375d02cf567138f110365e0/analysis/1457095059/
Seems to be detected now ;)
However the payload (possible ransomware) we do not know, but i guess Milos is working on it as we speak ;)
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Thanks for the scan result. From what I see we did not have this document before. We created detection on similar document, but it was released too late for you :-(.
Can I ask how the document was opened? If it was MS Office, which version? What email client was used? Or it was saved from webmail and openned by user and macros were enabled by user?
Milos
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Yes it does. The infection happened on Wednesday 2/3/2016. It must have been a new variation which is now being detected.
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It came in via email. The email client was Outlook 2013. The user normally is pretty good at blocking such emails, but on this occasion he must have opened the attachment. Lessons learnt as they say!
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It came in via email. The email client was Outlook 2013. The user normally is pretty good at blocking such emails, but on this occasion he must have opened the attachment. Lessons learnt as they say!
Unfortunately this is still very evident:
(http://screencast-o-matic.com/screenshots/u/Lh/1457098404945-83483.png)
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It came in via email. The email client was Outlook 2013. The user normally is pretty good at blocking such emails, but on this occasion he must have opened the attachment. Lessons learnt as they say!
always upload attachments and test before you open ;)
www.virustotal.com / www.metascan-online.com / www.jotti.org
and if not detected, send it to avast >> https://forum.avast.com/index.php?topic=14433.msg1289438#msg1289438