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milopware

Identifying Ransomware

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Hi all i'm hoping someone can help me work out which ransomware has encrypted my files as the method / ransom note etc doesn't seem to match anything in the decryption software assistance page...

my documents have all been renamed, all names are different, for example these files were .jpg but now called Zenis-0b.0bUMIAhxyu6B / Zenis-0E.0EjBzgesopM2 / Zenis-2q.2qYIjYnApmsC

the ransom note is a html doc called Zenis-instructions.html as below:

I have a feeling the <small hidden> text at the bottom could be the encryption key used just looks a bit random?

can anyone help with this?

 

<title>Zenis</title>
<p>*** All your files has been encrypted ***</p>
<p>I am ZENIS. A mischievous boy who loves cryptography, hardware and programming. My world is full of unanswered questions and puzzles half and half, and I'm coming to discover a new world. A world in digital space that you are supposed to play the role of my toys.</p>
<p>If you want to win in this game, you have to listen carefully to my instructions, otherwise you will be caught up in a one-step game and you will become the main loser of the story.</p>
<p>My instructions are simple and clear. Then follow these steps:</p>
<p>1. Send this file (Zenis-Instructions.html) to my email with one your encrypted file less than 2 MB to trust to the game.</p>
<p>2. I decrypt your file for free and send for you.</p>
<p>3. If you confirm the correctness of the files, verify that the files are correct via email</p>
<p>4. Then receive the price of decrypting files</p>
<p>5. After you have deposited, please send me the payment details</p>
<p>6. After i confirm deposit, i send you the "Zenis Decryptor" along with "Private Key" to recovery all your files.</p>
<p>Now you can finish the game. You won the game. congratulations.</p>
<br>Please submit your request to both emails:</br>
<br>[email protected]</br>
<br>[email protected]</br>
<br>If you did not receive an email after six hours, submit your request to the following emails:</br>
<br>[email protected]</br>
<br>[email protected] (On the TOR network)</br>
<br></br>
<span style="color:#FF0000;font-family:Arial;font-size:13px;">Warning: 3rd party and public programs, It may cause irreversible damage to your files. And your files will be lost forever.</span>
<small hidden>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:cDHsqhXuJub2MVk19lztsIWTTGXd49Dc0TAl+mwy1zDsGNmrIDABTaFHIlW5pOt3ZWudI9l1UPziv2yxeaEX2LjFJ+5figQEdBQbJZLUA3ACyE+qpw0CU97KiTG05w09zu4u1NvBnflW2ZN1jHseP1BPaV7++kj0k0JE8TJGXhQM8uXQOgrnN/DxQ7DWE4EXPtNCjOSocwmamgorjgtnwT2OJhe77Kw4x4Uw5OCYe6mCLrgarKVacfLK+I6DT+NSOoJu3fp+PrFGYkRZRSw5dJeV+oadKbNNPznGPhGddSOHYliiVD0mKrOWNuGdE88H75sBFgjpSsoz2CoBSS176Q==</small>

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I did this and got the following:

This ransomware is still under analysis.
Please refer to the appropriate topic for more information. Samples of encrypted files and suspicious files may be needed for continued investigation

Not enough information is public about Zenis. Please check back later.

Does this mean i've had a zero hour attack?

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It looks like analysts are still looking for a copy of the ransomware itself. There have been a few victims who have reported infections, but no one has had a copy of the malicious file that encrypted the files thus far.

Let's try getting a log from FRST, and see if it shows any sign of the ransomware on your computer. You can find instructions for downloading and running FRST at the following link:
https://helpdesk.emsisoft.com/en-us/article/274-running-a-scan-with-frst

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Any idea what these files are?

C:\Documents and Settings\miles\handle.exe
C:\WINDOWS\PanelH.exe
C:\WINDOWS\start.bat
C:\WINDOWS\setup.bat
C:\WINDOWS\HelpPane.exe
C:\WINDOWS\start.vbs
C:\WINDOWS\install.vbs
C:\WINDOWS\nssm.exe

If not, then ZIP them, and attach the ZIP file to a reply. Or send them to me in a Private Message.

Also, do you know how the server was infected? Was it due to an RDP compromise, or something else?

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please find attached the requested files. I have no idea what they are but looking at them could it be possible that the start.bat file has the encryption key in it?...

from start.bat file

C:\windows\WindowsHelpPanel\svchost.exe -l zec-eu1.nanopool.org:6666 -u t1Ynpy5dBWxuJsDTbYzAfNnuRpwLrX38vqJ/MindFlyer/[email protected] -p x

and is this where it was emailed to?

is there a way of determining which program was used to encrypt the files? im guessing there is a finite number of programs so is there a way of telling by looking at one of the encrypted files?

I think the server was compromised via a virus on a machine connected to the domain, but I cannot be certain, there were virus scan messages showing on the screen of the server referring to a virus called RDN/PWS-Banker (see logs below)

When I scanned client machines 2 of them were infected with Trojan Downloader :097M/Donoff

05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Start Page RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HKLM\Software\Microsoft\Internet Explorer\Main|Start Page RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Start Page RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Deleted  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe C:\WINDOWS\TEMP\GXDRV.EXE RDN/PWS-Banker (Trojan)
05/03/2018 17:36:22 Deleted  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe C:\Windows\Temp\gxdrv.exe RDN/PWS-Banker (Trojan)

info.zip

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ive just been looking at another one of your cases and saw this about shadow copies:
 

Quote

 

Shadow Copies if you were using Microsoft's own backup software for data backups (although sometimes the System Restore will save copies of files in the Volume Shadow Copies).
http://www.shadowexplorer.com/

In cases where the Volume Shadow Copies are deleted, then note that ransomware doesn't generally delete them securely, so it might be possible to use a file undelete utility to undelete the old Volume Shadow Copies

 

I have managed to recover some shadow copies but the shadowexplorer software doesn't seem to 'see' them, do you have any ideas why this would be? it can see shadow copies created after the event but nothing from the ones that were created before, do they need to be 'mounted' by the system? and is this what you mean about having the hard disk plugged into another machine or booted from a disk?

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BleepingComputer now has an article about this ransomware, however note that a full analysis is still pending:
https://www.bleepingcomputer.com/news/security/zenis-ransomware-encrypts-your-data-and-deletes-your-backups/

 

18 hours ago, milopware said:

from start.bat file

C:\windows\WindowsHelpPanel\svchost.exe -l zec-eu1.nanopool.org:6666 -u t1Ynpy5dBWxuJsDTbYzAfNnuRpwLrX38vqJ/MindFlyer/[email protected] -p x

and is this where it was emailed to?

That's a cryptocurrency miner. "Nanopool" is a popular mining pool, and the part after the "-u" (with the e-mail address) identifies the wallet and account to credit.

Does the fake svchost.exe that it executes exist?

 

18 hours ago, milopware said:

is there a way of determining which program was used to encrypt the files? im guessing there is a finite number of programs so is there a way of telling by looking at one of the encrypted files?

Normally such a program would have deleted itself after encrypting files. Right now we're just looking for anything out of the ordinary and checking to see what it is, however based on available information it looks like it has already deleted itself.

 

18 hours ago, milopware said:

When I scanned client machines 2 of them were infected with Trojan Downloader :097M/Donoff

Have any copies of those files? That may be the trojan that installed the ransomware:
https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=TrojanDownloader:O97M/Donoff

 

17 hours ago, milopware said:

I have managed to recover some shadow copies but the shadowexplorer software doesn't seem to 'see' them, do you have any ideas why this would be? it can see shadow copies created after the event but nothing from the ones that were created before, do they need to be 'mounted' by the system?

Most ransomware uses vssadmin.exe to delete Volume Shadow Copies (including Zenis), so that's probably why you can't see them.

 

17 hours ago, milopware said:

and is this what you mean about having the hard disk plugged into another machine or booted from a disk?

That's recommended for another reason. Since ransomware usually uses vssadmin.exe to delete the Volume Shadow Copies, they don't get overwritten write away, meaning that file undelete/recovery software might be able to recover them. However, you can't access the SystemVolumeInformation folder like that while Windows is running normally, so you need to either use a boot disk or connect the hard drive to another computer in order to gain read/write access to the SystemVolumeInformation folder and be able to recover deleted files there.

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3 hours ago, GT500 said:

Does the fake svchost.exe that it executes exist?

the folder C:\windows\WindowsHelpPanel doesn't exist, would it be useful for me to do a data recovery and attempt to find this .exe file?

and doe this mean they have a copy of the malicious file now? (as per your initial comments above on Thursday)

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it seems my server is under attack again, I have installed Malwarebytes and it picked up the attack before it happened, not sure what the attackers intentions were as data is still encrypted from last attack...
I have isolated some more files / folders... it seems the attacker has created 2 user 'profiles' in the Documents & settings directory one called sysyem (not a typo) and the other called support.
The 'support' profile has WindowsHelpPanel.exe in the desktop folder & in the My documents / Downloads folder.

Also found:
C:\WINDOWS\WindowsHelpServices folder containing install.vbs / setup.bat & Winhost.exe
C:\WINDOWS\winhosts folder containing install.vbs / setup.bat / windriver.exe & winhost.exe
C:\windows folder contains PanelH.exe / HelpPane.exe / nssm.exe / install.vbs / start.vbs / setup.bat / start.bat

also there is an auto start service installed which is called WindowsHelpServices Microsoft Windows Glossary Help Service which runs C:\WINDOWS\WindowsHelpServices\Winhost.exe

Are any of these helpful to you to assist in getting a fix / decryption of files?

also Antivirus found these files too:

18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HideFileExt GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe SuperHidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ShowSuperHidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Hidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoRun GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoFolderOptions GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:21 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoControlPanel GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HideFileExt GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe SuperHidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ShowSuperHidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Hidden GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoRun GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoFolderOptions GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe NoControlPanel GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe DisableTaskMgr GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe DisableRegistryTools GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot|AlternateShell GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe AlternateShell GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HKEY_USERS\S-1-5-21-1596741894-1545071027-4100810151-1139\Software\Microsoft\Internet Explorer\Main|Start Page GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Start Page GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe HKLM\Software\Microsoft\Internet Explorer\Main|Start Page GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Start Page GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe Type GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Cleaned  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe ValueName GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Deleted  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe C:\WINDOWS\STUB.EXE GenericRXDX-TG!24179320AFD8 (Trojan)
18/03/2018 10:20:22 Deleted  NT AUTHORITY\SYSTEM C:\WINDOWS\System32\rundll32.exe C:\windows\stub.exe GenericRXDX-TG!24179320AFD8 (Trojan)

 

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On 3/17/2018 at 10:31 AM, milopware said:

the folder C:\windows\WindowsHelpPanel doesn't exist, would it be useful for me to do a data recovery and attempt to find this .exe file?

No, it's just a cryptocurrency miner, and probably a well detected one (otherwise it would still be there).

 

On 3/17/2018 at 10:31 AM, milopware said:

and doe this mean they have a copy of the malicious file now? (as per your initial comments above on Thursday)

The article from BleepingComputer included code examples, which means that someone ran the malware through a debugging tool, so they have a copy of the ransomware. Considering how closely our team works with Michael Gillespie and BleepingComputer, I would be surprised if they hadn't shared the ransomware samples they had with our malware analysts as well.

Important Note: Michael Gillespie has said that he has a way to decrypt files encrypted by this ransomware, and has asked victims to send him a Private Message to request assistance:
https://www.bleepingcomputer.com/forums/t/673319/zenis-ransomware-help-support-topic-zenis-zenis-instructionshtml/#entry4466386

You can either contact him through BleepingComputer's forums, or through ours.

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7 hours ago, milopware said:

it seems my server is under attack again, I have installed Malwarebytes and it picked up the attack before it happened, not sure what the attackers intentions were as data is still encrypted from last attack...

It could very well be a new attacker trying to encrypt files a second time.

Just in case this was an RDP compromise, please review the following recommendations for getting started with securing RDP:

First I recommend temporarily disabling all port rules in your firewall (closing all open ports) until you can do a full audit of your firewall configuration and determine which ports need to remain open. There are some basic recommendations below to help get you started with the port audit.

If you are managing a company network, then some form of IPS/IDS is highly recommended to monitor the network for intrusions. If you already have such a system in place, then I recommend a full audit of any rules you have configured to make sure that the device is providing adequate monitoring. It is also recommended to have someone with penetration testing experience verify that the IPS/IDS is properly alerting when there are intrusion attempts.

Also, quickly change all passwords on any workstations and/or servers that are connected to the same network as the compromised system. Also be sure to change passwords on any online accounts, as well as any routers or switches (or other devices that have network-accessible administration functions).

I recommend that every account have a different password, that passwords be no shorter than 25 characters and be made up of a random combination of uppercase letters, lowercase letters, numbers, and symbols. Obviously passwords like that are difficult (if not impossible) to remember, so a password manager may be required in order to aid in managing passwords. KeePass is probably the simplest password manager, and stores password databases locally instead of on some "cloud" server. If something capable of automatically filling in passwords (or sharing passwords between multiple devices/users) is necessary then there are reasonable passwords managers from LastPass, bitwarden, 1Password, Dashlane, etc. Note that unlike KeePass, these password managers work as extensions added to web browsers (or apps on mobile phones), and they store password databases online.

When auditing your firewall configuration and preparing to reopen ports, I recommend never opening ports globally unless absolutely necessary. I also recommend requiring anyone who needs access to sensitive services (RDP, Windows Networking, etc) to connect to the network via a VPN so that you don't have to open ports for those services in the firewall, and then only open the VPN port in the firewall for IP addresses that need access to it. If someone who needs access has a dynamic IP, then many firewalls these days support something like Single Packet Authorization or Port Knocking to dynamically open ports for unknown IP addresses.

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